JP4006249B2

JP4006249B2 - Optical transmission / reception module, mounting method therefor, and optical transmission / reception apparatus

Info

Publication number: JP4006249B2
Application number: JP2002075419A
Authority: JP
Inventors: 幸子竹内; 浩二大浦; 仁麿東郷; 弘明浅野
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-03-19
Filing date: 2002-03-19
Publication date: 2007-11-14
Anticipated expiration: 2022-03-19
Also published as: JP2003270496A

Description

【０００１】
【発明の属する技術分野】
本発明は光ファイバ伝送路に接続して、光信号を送受信する光送受信モジュール（光加入者線終端装置）及びその実装方法、並びに光送受信装置に関する。
【０００２】
【従来の技術】
光伝送システムにおいて、１本の光ファイバを用いて双方向伝送を行う場合には、発光素子から出射される送信光を光ファイバに結合し、また、その光ファイバから出射される受信光を受光素子へ結合する必要があるが、その結合方法に関して、様々な方法が提案されている。
【０００３】
図１６は特開２０００−１８０６７１号公報に開示された従来の光信号伝送系における光送受信モジュールの概略構成図である。同図において、光ファイバ４２を内蔵するフェルール４１の先端面の光軸上に、第１の波長λ１の光を光軸方向に通過させ、かつ第２の波長λ２の光を光軸と垂直方向に反射させるプリズム形の波長合分波カプラ４３を固定するとともに、前記光軸方向及び光軸と垂直方向にそれぞれ発光素子２２、受光素子３１を配置し、これらを単一のケース部材１１で固定支持しており、また、波長合分波カプラ４３と発光素子２２、受光素子３１との間の各光軸上にそれぞれ単一のレンズ１３、３３が配置されている。発光素子２２からの波長λ１の送信光は波長合分波カプラ４３をそのまま光軸方向に通過して光ファイバ４２に送信される。一方、光ファイバ４２からの波長λ２の受信光は波長合分波カプラ４３で光軸と垂直方向に反射され、受光素子３１で受信される。
【０００４】
【発明が解決しようとする課題】
上述した従来の光送受信モジュールにおいては、発光素子２２と光ファイバ４２とを高精度で光結合させるため、及び、受光素子３１と光ファイバ４２とを高精度で光結合させるために、２つのレンズ１３、３３やフェルール４１を微調整する必要があり、調整箇所が多いことに加えて、発光素子２２及び受光素子３１をそれぞれ円筒型のパッケージに実装して、ケース部材１１で固定するため、モジュールの小型化が困難であった。
【０００５】
本発明は、上記従来装置の課題を解決するためになされたもので、発光素子及び受光素子と光ファイバとの光学結合が、１個の集光レンズを用いた１回の調整（アライメント）のみで実現でき、また小型化が容易な光送受信モジュール及びその実装方法、並びに光送受信装置を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、請求項１に係る発明は、光ファイバで双方向に伝送される光を、光ファイバの一端部にて送受信するに当たり、光の進行経路に沿って基部から突出する第１の突起部及び第２の突起部が形成され、第１の突起部は光の進行経路となる切欠きを有し、第２の突起部は第１の平面を有し、さらに、第１の突起部は切欠きの底部に第２の平面、及び第２の突起部と対向する側に第１の斜面を有する立体回路基板と、第１の平面上に実装された送信用の発光素子と、第２の平面上に実装された受信用の受光素子と、第１の斜面上に装着された光学膜部材と、光ファイバと立体回路基板との間の光の進行経路に設けられた集光レンズとを備えたものである。
上記構成により、発光素子、受光素子、光学膜部材を１つの立体回路基板上に集積化することにより小型化できるとともに、発光素子、受光素子と光ファイバとの光学的結合が、１つの集光レンズを用いた１回の調整（アライメント）のみで実現できる。
【０００７】
請求項２に係る発明は、光学膜部材としてハーフミラーを用い、発光素子から出射した光がハーフミラーを一定の割合で通過し、集光レンズで集光されて光ファイバに入射し、光ファイバから出射した光が集光レンズで集光され、ハーフミラーで一定の割合で反射して受光素子に入射するようにしたものである。
このように構成したことにより、同一波長での時間多重通信用送受信モジュールに適用することができる。
【０００８】
請求項３に係る発明は、光ファイバが互いに波長の異なる光を双方向に伝送するとき、光学膜部材として、光ファイバより出射され、集光レンズで集光された受信光を全反射して受光素子に入射させ、発光素子から出射する送信光を全透過して集光レンズで集光して光ファイバに入射させる波長フィルタを用いたものである。
このように構成したことにより、発光素子の出射光及び受光素子の入射光の損失を低減でき、送信波長と受信波長が異なるため、同時に送受信できる波長多重通信用送受信モジュールに適用することができる。
【０００９】
請求項４に係る発明は、受光素子の周囲を光学的に他から遮断する額縁状の突起を設け、受信光のみを透過する波長フィルタによって、突起の開放端を覆ったものである。
このように構成したことにより、発光素子の出射光の受光素子へのもれこみを遮断でき、光クロストークを改善することができる。
【００１０】
請求項５に係る発明は、受信光の波長、すなわち、受信波長帯域に対して高い光感度をもち、送信光の波長に対して低い受光感度をもつ受光素子を用いたものである。
このように構成したことにより、発光素子の出射光に対する受光素子の受光感度を抑えることができ、光クロストークを改善することができる。
【００１１】
請求項６に係る発明は、送信光を出射する発光素子の後背部の第１の平面上に、発光素子の後方出射光の受光を可能に実装された出力モニタ用受光素子を備えたものである。
このように構成したことにより、出力モニタ機能を備えた光送受信モジュールをより一層小型化することができる。
【００１２】
請求項７に係る発明は、立体回路基板が、第２の突起部よりも光ファイバから遠い側に形成された第３の突起部を備え、この第３の突起部は発光素子に対向して第１の平面に対して所定の角度だけ傾斜した斜面を有し、この斜面上に発光素子の後方出射光の受光を可能に実装された出力モニタ用受光素子を備えたものである。
このように構成したことにより、発光素子の後方出射光が出力モニタ用受光素子の端面で反射して発光素子に戻るのを防ぐことができる。
【００１３】
請求項８に係る発明は、立体回路基板が、第２の突起部の後背部に第３の突起部を備え、この第３の突起部は光の進行経路よりも所定の寸法だけ高く形成され、第１の平面とほぼ平行な第３の平面と、第３の突起部の発光素子の後方出射光が照射される中央部が切欠かれ、その切欠きの底部に第１の平面に対して鈍角に傾斜し、かつ、反射面が形成された第３の斜面とを有し、第３の平面上に、発光素子の後方出射光が第３の斜面の反射面で反射された光の受光を可能に実装された出力モニタ用受光素子を備えたものである。
このように構成したことにより、発光素子、受光素子、出力モニタ用受光素子の実装方向が同一であるため、実装を簡略化できる。
【００１４】
請求項９に係る発明は、立体回路基板が、第２の突起部よりも光ファイバから遠い側に形成され、第１の平面とほぼ平行で、かつ、第１の平面よりも所定の寸法だけ低く形成された第４の平面と、第４の平面よりも光ファイバから遠い側に形成され、発光素子に対向して第１の平面に対して鋭角に傾斜した反射面を有する壁部とを備え、第４の平面上に、発光素子の後方出射光が反射面で反射された光の受光を可能に出力モニタ用受光素子を実装したものである。
このように構成したことにより、発光素子、受光素子、出力モニタ用受光素子の実装方向が同一で、かつ２つの受光素子の受光面の方向も同じであることより、実装を共通化、簡略化することができる。
【００１５】
請求項１０に係る発明は、立体回路基板が、発光素子よりも光ファイバから遠い側に形成され、発光素子の後方出射光を通過させる開口を有する壁部を備え、壁部の後背面に、開口を通過する後方出射光の受光を可能に出力モニタ用受光素子を実装したものである。
このように構成したことにより、発光素子と出力モニタ用受光素子の距離を短くすることができ、モジュール全体を小型化することができる。
【００１６】
請求項１１に係る発明は、光ファイバで双方向に伝送される光を、前記光ファイバの一端部にて送受信するに当たり、送受信する光の進行経路に沿ってそれぞれ基部から突出し、光ファイバに近い側に第１の突起部が、光ファイバから遠い側に第２の突起部が形成され、かつ、脚部及び腕部で構成された逆「Ｌ」字形をなし、腕部を光ファイバ側に向けて第２の突起部の後方端部に脚部が結合された金属基板を付帯し、金属基板の腕部は第１及び第２の突起部間に光の進行経路よりも所定の寸法だけ高く形成された第１の平面を有し、第１の突起部は光の進行経路となる切欠きを有し、かつ、切欠きの底部に第１の平面にほぼ平行で、かつ、第１の平面よりも低く形成された第２の平面、及び第２の突起部と対向する側に第２の平面に対して鋭角の角度を持った第１の斜面を有する立体回路基板と、
第１の平面下に、光の進行経路に実装された送信用の発光素子と、第２の平面上に実装された受信用の受光素子と、第１の斜面上に装着された光学膜部材と、光ファイバと立体回路基板との間の光の進行経路に設けられる集光レンズと、第２の突起部に実装され、発光素子の後方出射光の受光を可能に実装された出力モニタ用受光素子とを備えたものである。
このように構成したことにより、発光素子の放熱を効率よく行い、また発光素子、受光素子の配線間の電気的なクロストークを低減させることができる。
【００１７】
請求項１２に係る発明は、集光レンズを立体回路基板の光ファイバ側の端面に固着したものである。
このように構成したことにより、集光レンズの支持具が不要で、構成を簡略化することができる。
【００１８】
請求項１３に係る発明は、発光素子、受光素子、光学膜部材及び出力モニタ用受光素子のうち、少なくとも発光素子、受光素子、光学膜部材を実装した立体回路基板をパッケージで覆い、パッケージの光ファイバ側の開口窓に集光レンズを設けたものである。
このように構成したことにより、封止をするパッケージが集光レンズの固定具の機能を兼ね備えることができる。
【００１９】
請求項１４に係る発明は、上述した光送受信モジュールを実装するに当たり、立体回路基板に、発光素子、受光素子及び出力モニタ用受光素子のうち、少なくとも発光素子及び受光素子を実装して電気的接続を行う第１の工程と、光学膜部材及び集光レンズを実装する第２の工程と、発光素子を発光させ、光ファイバへの結合効率が最もよくなるように光ファイバの位置を微調整して固定する第３の工程とを順を追って行うものである。
上記の方法を採用したことにより、発光素子、受光素子の光ファイバへの結合をレンズ、光ファイバ間の光学的調整のみで実現できる。
【００２０】
請求項１５に係る発明は、上述したいずれか一つの光送受信モジュールを１個又は複数個備えた光送受信装置である。
このように構成したことにより、光送受信装置を小型化でき、また、光送受信モジュールを集積化した多ポート光送受信装置を実現することができる。
【００２１】
【発明の実施の形態】
以下、本発明を図面に示す好適な実施の形態に基づいて詳細に説明する。図１は本発明に係る光送受信モジュールの第１の実施の形態の側面図であり、図２はこの実施の形態を構成する光送受信用の半導体素子が実装された立体回路基板の斜視図であり、図３はこの立体回路基板に光学膜部材としてのハーフミラーを実装した平面図である。
【００２２】
ここで、立体回路基板１０１Ａは金型成形した樹脂などの非金属基板で構成され、略平坦な底面を有する基部１０１ａに対して部分的に突出した第１の突起部１０１ｂと第２の突起部１０１ｃとが形成されている。このうち、第２の突起部１０１ｃの頂部の平面、すなわち、第１の平面１０２上に送信用の発光素子（ＬＤ）１０３が実装されており、この発光素子１０３の光出射側に形成された第１の突起部１０１ｂは、発光素子１０３の光軸に対して鋭角を持って上向きに傾斜し、かつ、発光素子１０３に対向して形成された第１の斜面１０４を有し、この第１の斜面１０４上に光学膜部材としてのハーフミラー（ＷＤＭ）１０５が実装されている。
【００２３】
また、第１の斜面１０４が形成された第１の突起部１０１ｂは、幅方向の中央部が切り欠かれており、その切欠部１０４ａの底部に、第１の平面１０２よりも低い位置で、かつ、第１の平面１０２と、ほぼ平行な第２の平面１０６（第１の斜面１０４とは鋭角をなす）が形成され、その平面１０６上に受信用の受光素子（ＰＤ）１０７が実装されている。したがって、発光素子１０３の出射光の一部はハーフミラー１０５を透過して進むことができ、その先方に集光レンズ１０８と光ファイバ１０９とが順に配置されている。
【００２４】
上記のように構成された光送受信モジュールの実装手順について以下に説明する。
立体回路基板１０１に発光素子１０３及び受光素子１０７を、それぞれの送受信光がハーフミラーを透過し反射して光ファイバに結合できるように位置合わせして、それぞれ第１の平面１０２及び第２の平面１０６上に実装し、その後に電気的接続をして受、給電できる状態にする。次にハーフミラー１０５を第１の斜面１０４上に実装し、さらに、集光レンズ１０８を立体回路基板１０１に対して固定された図示省略の保持具に実装する。最後に光ファイバ１０９を図示省略の微調整が可能な保持具に実装して発光素子１０３及び受光素子１０７との光学的結合が図られる。
【００２５】
この光学的結合について詳細に説明すると、まず、発光素子１０３を発光させ、光ファイバ１０９の出射光をモニタしておき、立体回路基板１０１に対する光ファイバの位置を微調整しつつ、光ファイバ１０９の出力が最も大きくなるところで固定する。ここで、発光素子１０３及び受光素子１０７の光軸が交差する位置を通り、発光素子、受光素子がハーフミラーの面に対して対称となる様に実装されるため、受光素子１０７と光ファイバ１０９との光学的結合も同時に実現できる。
以上に述べた実装方法は、以下に説明する他の実施の形態に対しても同様に適用できる。
【００２６】
次に、この光送受信モジュールの動作について説明する。まず、発光素子１０３から出射した光はハーフミラー１０５を、ある一定の割合で透過し、残りの光が図面の上方へ反射する。ハーフミラー１０５を透過した光は集光レンズ１０８で集光され、光ファイバ１０９に結合して送信される。一方、伝送路を通して伝送されてきた受信光は集光レンズ１０８で集光され、ハーフミラー１０５で所定の割合で反射して受光素子１０７に入射し、残りの光は透過する。なお、送信と受信は時間的に分割されて、交互に行われる。
【００２７】
以上のように、２つの突起部の一方の頂部に第１の平面１０２が形成され、この突起部に並設される他の突起部の内側に第１の斜面１０４が形成され、この第１の斜面１０４が形成された突起の幅方向の中央部が切り欠かれるとともに、そのその切り欠き部の底面が、第１の平面１０２に対してほぼ平行な第２の平面１０６となった立体回路基板１０１に、発光素子１０３、受光素子１０７及びハーフミラー１０５を所定の精度で位置決めして実装することにより、光送受信モジュールの集積化及び小型化が可能となり、また、光ファイバ１０９との結合も、発光素子１０３、集光レンズ１０８及び光ファイバ１０９の光軸調整を一回行うだけで、受光素子１０７と光ファイバ１０９との結合も同時に実現でき、これによって実装の手順が簡略化される。
【００２８】
図４は本発明に係る光送受信モジュールの第２の実施の形態の構成を示す側面図であり、図中、図１から図３を用いて説明した第１の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この第２の実施の形態は、上記第１の実施の形態を構成するハーフミラー１０５の代わりに、光学膜部材として第１の波長フィルタ１１０を実装した点が異なり、これ以外は第１の実施の形態と全く同様に構成されている。この第２の実施の形態は、発光素子１０３が出射する光の送信波長と、受光素子１０７が受光する受信波長とが異なるシステムに適用されるもので、波長フィルタ１１０は送信波長を全透過させ、受信波長を全反射させる特性を有している。
【００２９】
次に、図４に示した第２の実施の形態の動作について説明する。
まず、発光素子１０３から出射した光は波長フィルタ１１０を全透過する。透過した光は集光レンズ１０８で集光され、光ファイバ１０９に結合し、送信される。一方、伝送路を伝送されてきた受信光は集光レンズ１０８で集光され、波長フィルタ１１０で全反射して受光素子１０７に入射する。
以上のように波長フィルタを用い、送信波長と受信波長を互いに異ならせることにより、発光素子１０３の出射光及び受光素子１０７の入射光の損失を低減することができ、全２重である、波長多重通信用送受信モジュールに適用することができる。
【００３０】
図５は本発明に係る光送受信モジュールの第３の実施の形態の構成を、部分的に断面を用いて示した側面図であり、図中、図４を用いて説明した第２の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この第２の実施の形態は、受光素子１０７が実装される立体回路基板１０１Ｂの第２の平面１０６上に、受光素子１０７の周囲を光学的に他から遮断する額縁状の突起１１１を設け、さらに、この突起１１１の開放端は受光素子の受光面とほぼ平行でありその開放端を覆うように第２の波長フィルタ１１２を実装した点が図４と構成を異にし、これ以外は図４と同一に構成されている。第２の波長フィルタ１１２は発光素子１０３から出射される波長の送信光を全反射し、図５では図示を省略した光ファイバ１０９から受信する波長の受信光を全透過させる特性を有している。
【００３１】
この第３の実施の形態においては、第２の実施の形態と、ほぼ同じ送受信動作をするが、新たに設けられた第２の波長フィルタ１１２は発光素子１０３からの迷光を反射することによって、前記迷光が誤って受光素子１０７に入射するのを防ぎ、受光素子１０７には受信光のみが入射することとなる。
以上のように、受光素子１０７の周囲を光学的に他から遮断する額縁状の突起１１１を設け、この突起１１１の光入射面を第２の波長フィルタ１１２で覆うことにより、光クロストークを低減することができる。
【００３２】
図６は本発明に係る光送受信モジュールの第４の実施の形態の構成を示す側面図であり、図中、図１から図３を用いて説明した第１の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この第４の実施の形態に係る立体回路基板１０１Ｃは、発光素子１０３が実装される第１の平面１０２上に、発光素子１０３が送信光を出射する方向とは反対側、すなわち、後方に出力モニタ用受光素子１１３を実装した点が第１の実施の形態と構成を異にし、これ以外は第１の実施の形態と同一に構成されている。この場合、出力モニタ用受光素子１１３は、発光素子１０３が送信光出射方向に限らず、後方にも出射することを利用したもので、ここでの出力モニタ用受光素子は側面からの受光が可能なものであり、後方からの出射光を出力モニタ用受光素子１１３で受光するものである。
【００３３】
図６に示した第４の実施の形態の動作について、第１の実施の形態と構成の異なる部分について説明する。発光素子１０３は送信光出射方向に対して後方にも出射するが、この後方出射光を受光した出力モニタ用受光素子１１３の出力電流をモニタしておき、この出力電流が一定になるように、発光素子１０３のバイアス電流を制御することにより、出力光レベルを一定に制御することが可能になる。
以上のように、立体回路基板１０１Ｃ上に、送信用の発光素子１０３、受光素子１０７、及び、ハーフミラー１０５又は第１の波長フィルタ１１０の他に、出力モニタ用の受光素子１１３を実装することにより、光送受信モジュールをさらに集積化でき、実装を簡略化することができる。
【００３４】
図７は本発明に係る光送受信モジュールの第５の実施の形態の構成を示す側面図であり、図中、図６を用いて説明した第４の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この第５の実施の形態に係る立体回路基板１０１Ｄは、発光素子１０３が送信光を放射する方向とは反対の後方にも、発光素子１０３に対向して図面の上向きに所定の角度だけ傾斜した第２の斜面１１４を有する第３の突起１０１ｄを備え、第２の斜面１１４に出力モニタ用の受光素子１１３を実装したものである。これによって、出力モニタ用受光素子１１３の受光面が発光素子１０３の後方出射光に対して傾斜することとなり、この点が第４の実施の形態と構成を異にしている。なお、出力モニタ用受光素子１１３は表面に受光面を有する標準的なものである。
【００３５】
図７に示した第５の実施の形態は、図６に示した第４の実施の形態と同じ動作をするが、出力モニタ用の受光素子１１３の受光面に対して、発光素子１０３の後方出射光が斜めに入射するため、出力モニタ用受光素子１１３の受光面による反射光が発光素子１０３に入射することを防ぐことが出来る。
以上のように、発光素子を実装している面の後方に位置する第２の斜面１１４に出力モニタ用受光素子１１３を実装することにより、表面入射可能な標準的な受光素子を使用することができ、また出力モニタ用受光素子の受光面での反射光の発光素子１０３への影響を低減することができる。
【００３６】
図８は本発明に係る光送受信モジュールの第６の実施の形態の構成を示す側面図であり、図９はこの実施の形態の斜視図である。各図中、図６に示した第４の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この実施の形態を構成する立体回路基板１０１Ｅは、発光素子１０３の光信号出射方向に対してその後方部位に、その頂部が第１の平面１０２よりも高い突出部１０１ｅが形成され、この突出部１０１ｅの頂部に第１の平面１０２とほぼ平行な第３の平面１１５が形成され、さらに、突出部１０１ｅの幅方向中間部が切欠かれて、その底面に発光素子１０３に対向し、かつ、上向きに所定の角度の傾斜（第１の平面１０２に対して鈍角の角度）を持った第３の斜面１１６が形成されている。そして、第３の斜面１１６には反射面が形成され、第３の平面１１５上に、出力モニタ用受光素子１１３を実装した点が図６と構成を異にしている。したがって、発光素子１０３の後方出射光は第３の斜面１１６に形成された反射面で反射され、その反射光が出力モニタ用受光素子１１３の裏面より入射することとなる。
【００３７】
このように構成することによって、発光素子１０３の後方出射光が第３の斜面１１６の反射面によって反射されて出力モニタ用受光素子１１３に入射するため、出力モニタ用受光素子１１３として、表面と裏面の両方から光入射できる標準的な受光素子を使用することができ、かつ、出力モニタ用受光素子１１３の実装方向が受光素子１０７と同一方向であるため、実装工程を簡略化することができる。
【００３８】
図１０は本発明に係る光送受信モジュールの第７の実施の形態の構成を示す側面図であり、図中、図６に示した第４の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この実施の形態を構成する立体回路基板１０１Ｆは、発光素子１０３の光信号出射方向に対してその後方部位を窪ませてその底部に第１の平面１０２とほぼ平行な第４の平面１１７を形成し、さらに、窪みの後方に壁部１１８を図面の上方に延出させるとともに、発光素子１０３に対向する上部の壁面１１９を下方斜めに傾斜させてこの壁面１１９に反射面を形成したものである。そして、第４の平面１１７上に出力モニタ用受光素子１１３を実装し、発光素子１０３の後方出射光が壁面１１９で反射して出力モニタ用受光素子１１３に向かうように、壁面１１９の傾斜角度が決定されている。
【００３９】
このように構成することによって、発光素子１０３の後方出射光を壁面１１９の反射膜で反射させて出力モニタ用受光素子１１３で受光することになり、これによって、出力モニタ用受光素子１１３として、表面から光入射できる標準的な受光素子を使用することができ、かつ、出力モニタ用受光素子１１３の実装方向が発光素子１０３及び受光素子１０７と同一方向であるため、実装工程を簡略化することができる。
【００４０】
図１１は本発明に係る光送受信モジュールの第８の実施の形態の構成を示す側面図であり、図中、図６に示した第４の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この実施の形態を構成する立体回路基板１０１Ｇは、発光素子１０３の光信号出射方向に対してその後方部位に、図面の上方に突出する壁部１１８を設けるとともに、発光素子１０３に対向する部位に開口１２０が設けられている。そして、発光素子１０３に対向する側とは反対側、すなわち、開口１２０の外側に受光面を合わせて出力モニタ用受光素子１１３が実装されている。
【００４１】
このように構成することによって、発光素子１０３の後方出射光が開口１２０を通して、出力モニタ用受光素子１１３の受光面に到達し、出力モニタ用受光素子１１３がこの後方出射光を受光することとなり、この結果、出力モニタ用受光素子１１３の実装スペースを少なくすることができるため、モジュールを小型化することができる。
【００４２】
図１２は本発明に係る光送受信モジュールの第９の実施の形態の構成を示す側面図であり、図中、図７に示した第５の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この実施の形態を構成する立体回路基板１０１Ｈは、図７に示した立体回路基板１０１中、発光素子１０３を実装した突起部を除去し、その代わりに、脚部１２１ａ及び腕部１２１ｂで構成された逆「Ｌ」字形の金属基板１２１を付帯し、その脚部１２１ａを立体回路基板本体の後方端部に結合し、その腕部１２１ｂを前方に向けて固定している。そして、金属基板１２１の腕部１２１ｂの先端部の底面にヒートシンク１２２を装着するとともに、このヒートシンク１２２の下面に発光素子１０３を実装した点が図７と構成上異なっている。なお、発光素子１０３は図７と同じ位置に実装されている。
【００４３】
上記のように構成された第９の実施の形態における光信号の送受信及び後方出射光の受光については、図７に示した第５の実施の形態と全く同様であるので省略するが、この第９の実施の形態は金属基板１２１に、ヒートシンク１２２を介して、発光素子１０３を実装するので、発光素子１０３の放熱効率が高められ、これによって動作の信頼性を高めることができ、また、発光素子と受光素子の実装基板を別にすることで、発光素子、受光素子の配線間の電気的クロストークを低減できる。
【００４４】
ちなみに、この実施の形態の実装手順を説明すると、以下のとおりである。まず、立体回路基板１０１に受光素子１０７及び出力モニタ用受光素子１１３を位置決めして実装し、その後に電気的接続をする。次に第１の波長フィルタ１１０を第１の斜面１０４に対し、平坦に実装する。一方、金属基板１２１に実装したヒートシンク１２２上に発光素子１０３を位置決めして実装し、電気的接続をして給電できる状態にする。その後に立体回路基板本体と金属基板１２１とを一体的に結合する。集光レンズ１０８や光ファイバ１０９の固定方法は第１の実施の形態と同じである。
【００４５】
なお、図１２に示した第９の実施の形態は、図７に示した第５の実施の形態を変形したが、上述した第４、第６から第８の各実施の形態を変形して、発光素子１０３を、ヒートシンク１２２を介して、金属基板１２１に実装する構成とすることにより、上述した場合と同様に、発光素子１０３の放熱効率が高められ、これによって動作の信頼性を高めることができ、また、発光素子と受光素子の実装基板を別にすることで、発光素子、受光素子の配線間の電気的クロストークを低減できるという効果も得られる。
【００４６】
図１３は本発明に係る光送受信モジュールの第１０の実施の形態の構成を示す側面図であり、図中、図７に示した第５の実施の形態と同一の要素には同一の符号を付してその説明を省略する。この実施の形態を構成する立体回路基板１０１Ｉは、発光素子１０３の出射光側の先端面１２３が底面に対して略垂直で、かつ、出射光の光軸に対しても垂直である。また、出射光側の突出部１０１ｂは、光軸を振り分けにして幅方向の中央部が切欠かれている。そして、先端面１２３の切欠きの中央部に、集光レンズ１０８の表面形状に合わせてこれを嵌め込む窪みが形成され、この窪みに集光レンズ１０８が接着剤にて固着されている。
このように、発光素子１０３の出射光側の先端面１２３に集光レンズ１０８を固着することにより、集光レンズ１０８の保持具を別個に設ける必要がなくなるため、構成の簡易化が実現される。
【００４７】
なお、図１３に示した第１０の実施の形態は、図７に示した第５の実施の形態を変形したものであるが、立体回路基板の出射光側の寸法、又は、集光レンズ１０８の焦点距離を適切に選定することによって、他の実施の形態に係る立体回路基板の先端面に固着すれば上述した場合と同様な効果が得られる。
また、図１３に示した第１０の実施の形態では、接着剤を用いて立体回路基板１０１の先端面に集光レンズ１０８を固着したがこれ以外の方法で集光レンズ１０８を窪みに固着しても良い。
【００４８】
図１４は本発明に係る光送受信モジュールの第１１の実施の形態の構成を、一部を破断して示した側面図である。これは、第１から第９の実施の形態において分離して示した集光レンズ１０８を一体的に組み立てたものである。ここで、図７に示した立体回路基板１０１を、入出力ピンを備えたパッケージ１２４内に収納格納し、耐湿性を高めるためにもこのパッケージ１２４により気密封止を行うが、発光素子１０３の出射方向に位置する、パッケージ１２４の開口窓に集光レンズ１０８を設置する。ただし、集光レンズ１０８の位置は第１の実施の形態と同様になるように、パッケージの高さをあらかじめ決めておく必要がある。
このように、立体回路基板を格納するパッケージの、発光素子の出射方向に位置する開口窓に集光レンズを設置することにより、気密封止用のパッケージを集光レンズの保持具としても機能させることができ、構成を簡略化することができる。
なお、パッケージ１２４内に他の実施の形態に係る立体回路基板を格納することができ、これによって上述した場合と同様な効果が得られる。
【００４９】
図１５は本発明に係る光送受信装置の一実施の形態の構成を示す透視図である。この実施の形態は第１から第１１の実施の形態のいずれの光送受信モジュールをも用いることができるが、特に、図１４に示した第１１の実施の形態に係る光送受信モジュール１２５を用いた場合を示している。
ここで、光送受信モジュール１２５は光伝送装置のメイン樹脂基板１２６の上に１個又は複数個実装され、光送受信装置筐体１２７内に収容されている。筐体１２７の前面パネルには光入出力ポートの機能を持つ光ファイバコネクタプラグ１２８が取り付けられている。
【００５０】
以上のように、立体回路基板を有する光送受信モジュールを光送受信装置筐体に収容することによって、光送受信装置を小型化することができ、また複数個実装することにより、多ポート光送受信装置を実現することができる。
【００５１】
【発明の効果】
以上説明したように、本発明によれば、立体回路基板に発光素子、受光素子、光学膜部材、出力モニタ用受光素子及び集光レンズのうち、少なくとも、発光素子、受光素子及び光学膜部材を一体的に収納したので、発光素子及び受光素子と光ファイバとの光学結合が、１個の集光レンズを用いた１回の調整のみで実現でき、また小型化が容易になるという効果が得られる。
【図面の簡単な説明】
【図１】本発明に係る光送受信モジュールの第１の実施の形態の側面図
【図２】図１に示した第１の実施の形態を構成する光送受信用の半導体素子が実装された立体回路基板の斜視図
【図３】図１に示した第１の実施の形態の立体回路基板に光学膜部材としてのハーフミラーを実装した平面図
【図４】本発明に係る光送受信モジュールの第２の実施の形態の構成を示す側面図
【図５】本発明に係る光送受信モジュールの第３の実施の形態の構成を、部分的に断面を用いて示した側面図
【図６】本発明に係る光送受信モジュールの第４の実施の形態の構成を示す側面図
【図７】本発明に係る光送受信モジュールの第５の実施の形態の構成を示す側面図
【図８】本発明に係る光送受信モジュールの第６の実施の形態の構成を示す側面図
【図９】図８に示した第６の実施の形態の斜視図
【図１０】本発明に係る光送受信モジュールの第７の実施の形態の構成を示す側面図
【図１１】本発明に係る光送受信モジュールの第８の実施の形態の構成を示す側面図
【図１２】本発明に係る光送受信モジュールの第９の実施の形態の構成を示す側面図
【図１３】本発明に係る光送受信モジュールの第１０の実施の形態の構成を示す側面図
【図１４】本発明に係る光送受信モジュールの第１１の実施の形態の構成を、一部を破断して示した側面図
【図１５】本発明に係る光送受信装置の一実施の形態の構成を示す透視図
【図１６】従来の光信号伝送系における光送受信モジュールの概略構成図
【符号の説明】
１０１Ａ〜１０１Ｉ立体回路基板
１０２第１の平面
１０３送信用発光素子
１０４第１の斜面
１０５ハーフミラー（光学膜部材）
１０６第２の平面
１０７受光素子
１０８集光レンズ
１０９光ファイバ
１１０第１の波長フィルタ
１１１突起
１１２第２の波長フィルタ
１１３出力モニタ用受光素子
１１４第２の斜面
１１５第３の平面
１１６第３の斜面
１１７第４の平面
１１８壁部
１１９壁面
１２０開口
１２１金属基板
１２２ヒートシンク
１２３立体回路基板の先端面
１２４気密封止パッケージ
１２５光送受信モジュール
１２６メイン樹脂基板
１２７光送受信装置筐体ラグ
１２８光ファイバコネクタプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical transmission / reception module (optical subscriber line termination device) that transmits and receives an optical signal connected to an optical fiber transmission line, a mounting method thereof, and an optical transmission / reception device.
[0002]
[Prior art]
When bidirectional transmission is performed using a single optical fiber in an optical transmission system, the transmission light emitted from the light emitting element is coupled to the optical fiber, and the reception light emitted from the optical fiber is received. Although it is necessary to couple | bond with an element, various methods are proposed regarding the coupling | bonding method.
[0003]
FIG. 16 is a schematic configuration diagram of an optical transceiver module in a conventional optical signal transmission system disclosed in Japanese Patent Laid-Open No. 2000-180671. In the figure, the light of the first wavelength λ1 is passed in the optical axis direction on the optical axis of the tip surface of the ferrule 41 containing the optical fiber 42, and the light of the second wavelength λ2 is perpendicular to the optical axis. The prism-type wavelength multiplexing / demultiplexing coupler 43 to be reflected is fixed, and the light emitting element 22 and the light receiving element 31 are arranged in the optical axis direction and the direction perpendicular to the optical axis, respectively, and these are fixed by a single case member 11. In addition, single lenses 13 and 33 are disposed on the optical axes between the wavelength multiplexing / demultiplexing coupler 43 and the light emitting element 22 and the light receiving element 31, respectively. The transmission light having the wavelength λ 1 from the light emitting element 22 passes through the wavelength multiplexing / demultiplexing coupler 43 in the optical axis direction and is transmitted to the optical fiber 42. On the other hand, the received light of wavelength λ 2 from the optical fiber 42 is reflected by the wavelength multiplexing / demultiplexing coupler 43 in the direction perpendicular to the optical axis and received by the light receiving element 31.
[0004]
[Problems to be solved by the invention]
In the conventional optical transceiver module described above, two lenses are used to optically couple the light emitting element 22 and the optical fiber 42 with high precision and to optically couple the light receiving element 31 and the optical fiber 42 with high precision. 13 and 33 and the ferrule 41 need to be finely adjusted. In addition to the large number of adjustment points, the light emitting element 22 and the light receiving element 31 are each mounted in a cylindrical package and fixed by the case member 11. It was difficult to reduce the size.
[0005]
The present invention has been made to solve the above-described problems of the conventional apparatus, and the optical coupling between the light emitting element, the light receiving element, and the optical fiber is performed only once by adjustment (alignment) using one condensing lens. It is an object of the present invention to provide an optical transmission / reception module, a mounting method thereof, and an optical transmission / reception apparatus that can be easily realized.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 projects from the base along the traveling path of light when transmitting and receiving light transmitted bi-directionally through the optical fiber at one end of the optical fiber. A first protrusion and a second protrusion are formed, the first protrusion has a notch serving as a light traveling path, the second protrusion has a first plane, and 1 is a three-dimensional circuit board having a second plane at the bottom of the notch and a first slope on the side facing the second protrusion, and light emission for transmission mounted on the first plane. A light receiving element mounted on the second plane; an optical film member mounted on the first slope; and a light traveling path between the optical fiber and the three-dimensional circuit board. And a condensing lens.
With the above configuration, the light emitting element, the light receiving element, and the optical film member can be miniaturized by integrating them on one three-dimensional circuit board, and the optical coupling between the light emitting element, the light receiving element, and the optical fiber can be combined into one light collecting element. This can be realized by only one adjustment (alignment) using a lens.
[0007]
The invention according to claim 2 uses a half mirror as the optical film member, and the light emitted from the light emitting element passes through the half mirror at a certain ratio, is condensed by the condenser lens, and enters the optical fiber. The light emitted from the light is collected by a condenser lens, reflected by a half mirror at a certain rate, and incident on the light receiving element.
With this configuration, it can be applied to a transmission / reception module for time-multiplexing communication at the same wavelength.
[0008]
In the invention according to claim 3, when the optical fiber transmits light having different wavelengths bi-directionally, the optical film member totally reflects the received light emitted from the optical fiber and collected by the condenser lens. A wavelength filter is used that is incident on the light receiving element, totally transmits the transmission light emitted from the light emitting element, condenses it with a condensing lens, and enters the optical fiber.
With this configuration, the loss of the emitted light from the light emitting element and the incident light from the light receiving element can be reduced, and since the transmission wavelength and the reception wavelength are different, the transmission and reception module for wavelength multiplexing communication can be applied.
[0009]
According to a fourth aspect of the present invention, there is provided a frame-like projection that optically blocks the periphery of the light receiving element from the other, and the open end of the projection is covered with a wavelength filter that transmits only received light.
With this configuration, leakage of light emitted from the light emitting element to the light receiving element can be blocked, and optical crosstalk can be improved.
[0010]
The invention according to claim 5 Wavelength of received light, ie For reception wavelength band for High light sensitivity It has a low light receiving sensitivity with respect to the wavelength of the transmitted light. It uses a light receiving element.
With this configuration, the light receiving sensitivity of the light receiving element with respect to the light emitted from the light emitting element can be suppressed, and optical crosstalk can be improved.
[0011]
The invention according to claim 6 is provided with a light receiving element for output monitoring mounted on the first flat surface of the back of the light emitting element that emits transmission light so as to be able to receive light emitted backward from the light emitting element. is there.
With this configuration, the optical transmission / reception module having the output monitor function can be further reduced in size.
[0012]
In the invention according to claim 7, the three-dimensional circuit board includes a third protrusion formed on the side farther from the optical fiber than the second protrusion, and the third protrusion faces the light emitting element. A light receiving element for output monitoring is provided which has a slope inclined by a predetermined angle with respect to the first plane, and is mounted on the slope so as to be able to receive light emitted backward from the light emitting element.
With this configuration, it is possible to prevent the backward emission light of the light emitting element from being reflected by the end face of the light receiving element for output monitoring and returning to the light emitting element.
[0013]
In the invention according to claim 8, the three-dimensional circuit board includes a third protrusion on the back of the second protrusion, and the third protrusion is formed higher than the light traveling path by a predetermined dimension. A third plane substantially parallel to the first plane and a central portion irradiated with the light emitted backward from the light emitting element of the third protrusion are notched, and the bottom of the notch is at the bottom with respect to the first plane. A third inclined surface inclined at an obtuse angle and having a reflecting surface formed thereon, and receiving light of the light emitted backward from the light emitting element reflected by the reflecting surface of the third inclined surface on the third plane. This is provided with a light receiving element for output monitoring that can be mounted.
With this configuration, the mounting directions of the light emitting element, the light receiving element, and the output monitoring light receiving element are the same, and thus mounting can be simplified.
[0014]
In the invention according to claim 9, the three-dimensional circuit board is formed on the side farther from the optical fiber than the second protrusion, is substantially parallel to the first plane, and has a predetermined dimension from the first plane. A fourth plane formed lower, and a wall portion formed on a side farther from the optical fiber than the fourth plane and having a reflection surface that faces the light emitting element and is inclined at an acute angle with respect to the first plane. And a light receiving element for output monitoring is mounted on the fourth plane so that the light emitted from the light emitted from the light emitting element is reflected by the reflecting surface.
With this configuration, the mounting direction of the light emitting element, the light receiving element, and the output monitoring light receiving element is the same, and the directions of the light receiving surfaces of the two light receiving elements are also the same. can do.
[0015]
In the invention according to claim 10, the three-dimensional circuit board is formed on the side farther from the optical fiber than the light emitting element, and includes a wall portion having an opening through which light emitted backward from the light emitting element passes. A light receiving element for output monitoring is mounted so as to be able to receive backward emitted light passing through the opening.
With this configuration, the distance between the light emitting element and the output monitoring light receiving element can be shortened, and the entire module can be downsized.
[0016]
According to an eleventh aspect of the present invention, when transmitting and receiving light bidirectionally transmitted by an optical fiber at one end portion of the optical fiber, each of the optical fibers protrudes from the base along the traveling path of the transmitted and received light and is close to the optical fiber. A first protrusion on the side, a second protrusion on the side far from the optical fiber, and an inverted “L” shape composed of a leg and an arm, with the arm facing the optical fiber A metal substrate with legs coupled to the rear end of the second protrusion is attached, and the arm of the metal substrate has a predetermined dimension between the first and second protrusions than the light traveling path. A first plane formed high, the first protrusion has a notch serving as a light propagation path, and is substantially parallel to the first plane at the bottom of the notch; The second plane formed lower than the plane of the second plane, and the second plane on the side facing the second protrusion A three-dimensional circuit board having a first inclined surface having an angle of the corner,
A light emitting element for transmission mounted on a traveling path of light below the first plane; a light receiving element for reception mounted on the second plane; First An optical film member mounted on the slope, a condensing lens provided in a light traveling path between the optical fiber and the three-dimensional circuit board, and a light receiving element that receives light emitted backward from the light emitting element, mounted on the second protrusion. And a light-receiving element for output monitoring that can be mounted.
With this configuration, it is possible to efficiently dissipate heat from the light emitting element and reduce electrical crosstalk between the wirings of the light emitting element and the light receiving element.
[0017]
According to a twelfth aspect of the present invention, the condenser lens is fixed to the end face of the three-dimensional circuit board on the optical fiber side.
By comprising in this way, the support tool of a condensing lens is unnecessary and a structure can be simplified.
[0018]
According to a thirteenth aspect of the present invention, a light emitting element, a light receiving element, an optical film member, and a light receiving element for output monitoring are covered with at least a three-dimensional circuit board on which the light emitting element, the light receiving element, and the optical film member are mounted. A condensing lens is provided in the opening window on the fiber side.
With such a configuration, the package to be sealed can also have the function of a fixture for the condenser lens.
[0019]
According to the fourteenth aspect of the present invention, when the above-described optical transceiver module is mounted, at least the light emitting element and the light receiving element among the light emitting element, the light receiving element, and the output monitoring light receiving element are mounted on the three-dimensional circuit board for electrical connection. A first step of performing an optical film Element And the second step of mounting the condenser lens and the third step of causing the light emitting element to emit light and finely adjusting and fixing the position of the optical fiber so that the coupling efficiency to the optical fiber is the best. Is what you do.
By adopting the above method, the coupling of the light emitting element and the light receiving element to the optical fiber can be realized only by optical adjustment between the lens and the optical fiber.
[0020]
The invention according to claim 15 is an optical transmission / reception apparatus including one or a plurality of any one of the optical transmission / reception modules described above.
With this configuration, the optical transmission / reception device can be reduced in size, and a multi-port optical transmission / reception device in which optical transmission / reception modules are integrated can be realized.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings. FIG. 1 is a side view of a first embodiment of an optical transceiver module according to the present invention, and FIG. 2 is a perspective view of a three-dimensional circuit board on which optical transceiver semiconductor elements constituting this embodiment are mounted. FIG. 3 is a plan view in which a half mirror as an optical film member is mounted on the three-dimensional circuit board.
[0022]
Here, the three-dimensional circuit board 101A is composed of a non-metal substrate such as a mold-molded resin, and the first protrusion 101b and the second protrusion that partially protrude from the base 101a having a substantially flat bottom surface. 101c. Among these, the light emitting element (LD) 103 for transmission is mounted on the plane of the top of the second protrusion 101c, that is, the first plane 102, and formed on the light emitting side of the light emitting element 103. The first protrusion 101 b has a first inclined surface 104 that is inclined upward with an acute angle with respect to the optical axis of the light emitting element 103, and is formed to face the light emitting element 103. A half mirror (WDM) 105 as an optical film member is mounted on the inclined surface 104.
[0023]
In addition, the first protrusion 101b on which the first slope 104 is formed has a notch at the center in the width direction, and the bottom of the notch 104a is lower than the first plane 102, A first plane 102 and a second plane 106 that is substantially parallel to the first plane (which forms an acute angle with the first inclined surface 104) are formed, and a receiving light receiving element (PD) 107 is mounted on the plane 106. ing. Therefore, part of the light emitted from the light emitting element 103 can travel through the half mirror 105, and the condensing lens 108 and the optical fiber 109 are arranged in that order on the far side.
[0024]
A procedure for mounting the optical transceiver module configured as described above will be described below.
The light emitting element 103 and the light receiving element 107 are aligned with the three-dimensional circuit board 101 so that each transmitted / received light can be transmitted through the half mirror, reflected, and coupled to the optical fiber, and the first plane 102 and the second plane, respectively. It is mounted on 106, and after that, an electrical connection is made so that power can be received and fed. Next, the half mirror 105 is mounted on the first inclined surface 104, and the condenser lens 108 is mounted on a holder (not shown) fixed to the three-dimensional circuit board 101. Finally, the optical fiber 109 is mounted on a holder (not shown) that can be finely adjusted, and optical coupling between the light emitting element 103 and the light receiving element 107 is achieved.
[0025]
The optical coupling will be described in detail. First, the light emitting element 103 is caused to emit light, the light emitted from the optical fiber 109 is monitored, and the position of the optical fiber with respect to the three-dimensional circuit board 101 is finely adjusted. Fix where the output is highest. Here, since the light emitting element and the light receiving element 107 are mounted so as to be symmetrical with respect to the plane of the half mirror through the position where the optical axes of the light emitting element 103 and the light receiving element 107 intersect, the light receiving element 107 and the optical fiber 109 are mounted. Can also be realized at the same time.
The mounting method described above can be similarly applied to other embodiments described below.
[0026]
Next, the operation of this optical transceiver module will be described. First, the light emitted from the light emitting element 103 is transmitted through the half mirror 105 at a certain rate, and the remaining light is reflected upward in the drawing. The light that has passed through the half mirror 105 is collected by the condenser lens 108, coupled to the optical fiber 109, and transmitted. On the other hand, the received light transmitted through the transmission path is collected by the condensing lens 108, reflected by the half mirror 105 at a predetermined ratio, and incident on the light receiving element 107, and the remaining light is transmitted. Transmission and reception are divided in time and performed alternately.
[0027]
As described above, the first flat surface 102 is formed on the top of one of the two protrusions, and the first inclined surface 104 is formed on the inner side of the other protrusions arranged in parallel with the protrusion. The three-dimensional circuit in which the central portion in the width direction of the protrusion on which the slope 104 is formed is cut out, and the bottom surface of the cut-out portion is a second plane 106 that is substantially parallel to the first plane 102. By positioning and mounting the light emitting element 103, the light receiving element 107, and the half mirror 105 on the substrate 101 with a predetermined accuracy, the optical transmission / reception module can be integrated and miniaturized, and the optical fiber 109 can be coupled. The light-receiving element 107 and the optical fiber 109 can be combined at the same time by adjusting the optical axes of the light-emitting element 103, the condensing lens 108, and the optical fiber 109 only once, thereby simplifying the mounting procedure. It is of.
[0028]
FIG. 4 is a side view showing the configuration of the second embodiment of the optical transceiver module according to the present invention, in which the same elements as those of the first embodiment described with reference to FIGS. 1 to 3 are used. Are given the same reference numerals and their description is omitted. The second embodiment is different from the first embodiment in that the first wavelength filter 110 is mounted as an optical film member instead of the half mirror 105 constituting the first embodiment. It is comprised in the completely same form of. This second embodiment is applied to a system in which the transmission wavelength of light emitted from the light emitting element 103 and the reception wavelength received by the light receiving element 107 are different. The wavelength filter 110 transmits the transmission wavelength completely. And has a characteristic of totally reflecting the received wavelength.
[0029]
Next, the operation of the second embodiment shown in FIG. 4 will be described.
First, the light emitted from the light emitting element 103 is totally transmitted through the wavelength filter 110. The transmitted light is collected by the condensing lens 108, coupled to the optical fiber 109, and transmitted. On the other hand, the received light transmitted through the transmission path is collected by the condenser lens 108, totally reflected by the wavelength filter 110, and incident on the light receiving element 107.
As described above, by using the wavelength filter and making the transmission wavelength and the reception wavelength different from each other, the loss of the emitted light of the light emitting element 103 and the incident light of the light receiving element 107 can be reduced. The present invention can be applied to a multiplex communication transceiver module.
[0030]
FIG. 5 is a side view partially showing a configuration of the third embodiment of the optical transceiver module according to the present invention using a cross-section, and in the drawing, the second embodiment described with reference to FIG. The same reference numerals are given to the same elements as those in the embodiment, and the description thereof is omitted. In the second embodiment, a frame-shaped protrusion 111 that optically blocks the periphery of the light receiving element 107 from the other is provided on the second plane 106 of the three-dimensional circuit board 101B on which the light receiving element 107 is mounted. Furthermore, the open end of the protrusion 111 is substantially parallel to the light receiving surface of the light receiving element, and the second wavelength filter 112 is mounted so as to cover the open end. It is configured identically. The second wavelength filter 112 has a characteristic of totally reflecting the transmitted light having the wavelength emitted from the light emitting element 103 and totally transmitting the received light having the wavelength received from the optical fiber 109 not shown in FIG. .
[0031]
In the third embodiment, the transmission / reception operation is almost the same as in the second embodiment, but the newly provided second wavelength filter 112 reflects stray light from the light emitting element 103, The stray light is prevented from entering the light receiving element 107 by mistake, and only the received light is incident on the light receiving element 107.
As described above, by providing the frame-shaped protrusion 111 that optically blocks the periphery of the light receiving element 107 from the other, and covering the light incident surface of the protrusion 111 with the second wavelength filter 112, optical crosstalk is reduced. can do.
[0032]
FIG. 6 is a side view showing the configuration of the fourth embodiment of the optical transceiver module according to the present invention. In FIG. 6, the same elements as those of the first embodiment described with reference to FIGS. Are given the same reference numerals and their description is omitted. The three-dimensional circuit board 101C according to the fourth embodiment outputs, on the first plane 102 on which the light emitting element 103 is mounted, on the side opposite to the direction in which the light emitting element 103 emits transmission light, that is, on the rear side. The configuration of the monitor light receiving element 113 is different from that of the first embodiment, and the other configuration is the same as that of the first embodiment. In this case, the output monitor light-receiving element 113 utilizes the fact that the light-emitting element 103 emits not only in the transmission light emission direction but also in the rear, and the output monitor light-receiving element here can receive light from the side surface. The output light from the rear is received by the light receiving element 113 for output monitoring.
[0033]
The operation of the fourth embodiment shown in FIG. 6 will be described with respect to parts that differ in configuration from the first embodiment. The light emitting element 103 also emits backward with respect to the transmission light emission direction, but the output current of the output monitoring light receiving element 113 that has received the backward emitted light is monitored, and the output current becomes constant. By controlling the bias current of the light emitting element 103, the output light level can be controlled to be constant.
As described above, in addition to the light emitting element 103 for transmission, the light receiving element 107, the half mirror 105, or the first wavelength filter 110, the light receiving element 113 for output monitoring is mounted on the three-dimensional circuit board 101C. Thus, the optical transceiver module can be further integrated, and the mounting can be simplified.
[0034]
FIG. 7 is a side view showing the configuration of the fifth embodiment of the optical transceiver module according to the present invention. In FIG. 7, the same elements as those of the fourth embodiment described with reference to FIG. Reference numerals are assigned and explanations thereof are omitted. The three-dimensional circuit board 101D according to the fifth embodiment is inclined by a predetermined angle in the upward direction of the drawing so as to be opposed to the light emitting element 103 and on the rear side opposite to the direction in which the light emitting element 103 emits transmission light. A third protrusion 101d having a second slope 114 is provided, and a light receiving element 113 for output monitoring is mounted on the second slope 114. As a result, the light receiving surface of the output monitor light receiving element 113 is inclined with respect to the light emitted rearward from the light emitting element 103, and this point is different from the configuration of the fourth embodiment. The output monitoring light receiving element 113 is a standard one having a light receiving surface on the surface.
[0035]
The fifth embodiment shown in FIG. 7 operates in the same manner as the fourth embodiment shown in FIG. 6, but is behind the light emitting element 103 with respect to the light receiving surface of the light receiving element 113 for output monitoring. Since the emitted light is incident obliquely, it is possible to prevent light reflected by the light receiving surface of the output monitoring light receiving element 113 from entering the light emitting element 103.
As described above, by mounting the output monitor light receiving element 113 on the second inclined surface 114 located behind the surface on which the light emitting element is mounted, a standard light receiving element capable of surface incidence can be used. In addition, the influence of the reflected light on the light receiving surface of the light receiving element for output monitoring can be reduced.
[0036]
FIG. 8 is a side view showing the configuration of the sixth embodiment of the optical transceiver module according to the present invention, and FIG. 9 is a perspective view of this embodiment. In each figure, the same reference numerals are given to the same elements as those in the fourth embodiment shown in FIG. 6, and the description thereof is omitted. The three-dimensional circuit board 101 </ b> E constituting this embodiment has a protrusion 101 e whose top is higher than the first plane 102 in the rear part with respect to the light signal emitting direction of the light emitting element 103. A third plane 115 that is substantially parallel to the first plane 102 is formed at the top of 101e, and further, the intermediate portion in the width direction of the protruding portion 101e is cut away, and the bottom surface thereof faces the light emitting element 103 and faces upward. A third slope 116 having a predetermined angle of inclination (obtuse angle with respect to the first plane 102) is formed. A reflective surface is formed on the third slope 116, and the configuration is different from that of FIG. 6 in that the output monitoring light receiving element 113 is mounted on the third plane 115. Therefore, the light emitted backward from the light emitting element 103 is reflected by the reflecting surface formed on the third inclined surface 116, and the reflected light enters from the back surface of the light receiving element 113 for output monitoring.
[0037]
With such a configuration, the light emitted backward from the light emitting element 103 is reflected by the reflecting surface of the third inclined surface 116 and enters the light receiving element 113 for output monitoring. A standard light receiving element capable of receiving light from both of them can be used, and the mounting direction of the output monitor light receiving element 113 is the same as that of the light receiving element 107, so that the mounting process can be simplified.
[0038]
FIG. 10 is a side view showing the configuration of the seventh embodiment of the optical transceiver module according to the present invention. In the figure, the same elements as those of the fourth embodiment shown in FIG. A description thereof will be omitted. The three-dimensional circuit board 101 </ b> F constituting this embodiment has a rear portion recessed with respect to the light signal emitting direction of the light emitting element 103 to form a fourth plane 117 substantially parallel to the first plane 102 at the bottom. Further, a wall 118 is extended to the upper side of the drawing at the rear of the depression, and an upper wall surface 119 facing the light emitting element 103 is inclined obliquely downward to form a reflection surface on the wall surface 119. . Then, the output monitor light receiving element 113 is mounted on the fourth plane 117, and the inclination angle of the wall surface 119 is such that the light emitted backward from the light emitting element 103 is reflected by the wall surface 119 and travels toward the output monitor light receiving element 113. It has been decided.
[0039]
By configuring in this way, the light emitted backward from the light emitting element 103 is reflected by the reflection film of the wall surface 119 and received by the light receiving element 113 for output monitoring. Can be used, and the mounting direction of the output monitoring light receiving element 113 is the same as that of the light emitting element 103 and the light receiving element 107, so that the mounting process can be simplified. it can.
[0040]
FIG. 11 is a side view showing the configuration of the eighth embodiment of the optical transceiver module according to the present invention. In the figure, the same elements as those of the fourth embodiment shown in FIG. A description thereof will be omitted. The three-dimensional circuit board 101 </ b> G constituting this embodiment is provided with a wall portion 118 projecting upward in the drawing in the rear portion with respect to the light signal emitting direction of the light emitting element 103, and at a portion facing the light emitting element 103. An opening 120 is provided. An output monitoring light receiving element 113 is mounted on the side opposite to the side facing the light emitting element 103, that is, outside the opening 120 with the light receiving surface aligned.
[0041]
By configuring in this way, the outgoing light from the light emitting element 103 reaches the light receiving surface of the light receiving element 113 for output monitoring through the opening 120, and the light receiving element 113 for output monitoring receives this rear outgoing light. As a result, the mounting space for the output monitoring light receiving element 113 can be reduced, and the module can be downsized.
[0042]
FIG. 12 is a side view showing the configuration of the ninth embodiment of the optical transceiver module according to the present invention. In FIG. 12, the same elements as those of the fifth embodiment shown in FIG. A description thereof will be omitted. The three-dimensional circuit board 101H constituting this embodiment is configured by removing the protrusions on which the light emitting elements 103 are mounted from the three-dimensional circuit board 101 shown in FIG. 7, and instead of the leg parts 121a and the arm parts 121b. Further, an inverted “L” -shaped metal substrate 121 is attached, its leg portion 121a is coupled to the rear end portion of the three-dimensional circuit board main body, and its arm portion 121b is fixed forward. 7 differs from the structure of FIG. 7 in that a heat sink 122 is mounted on the bottom surface of the tip of the arm portion 121b of the metal substrate 121 and the light emitting element 103 is mounted on the lower surface of the heat sink 122. The light emitting element 103 is mounted at the same position as that in FIG.
[0043]
The transmission / reception of the optical signal and the reception of the backward emission light in the ninth embodiment configured as described above are the same as those in the fifth embodiment shown in FIG. In the ninth embodiment, since the light emitting element 103 is mounted on the metal substrate 121 via the heat sink 122, the heat radiation efficiency of the light emitting element 103 can be increased, thereby improving the reliability of the operation and the light emission. By separating the mounting board of the element and the light receiving element, electrical crosstalk between the wirings of the light emitting element and the light receiving element can be reduced.
[0044]
Incidentally, the mounting procedure of this embodiment will be described as follows. First, the light receiving element 107 and the output monitoring light receiving element 113 are positioned and mounted on the three-dimensional circuit board 101, and then electrically connected. Next, the first wavelength filter 110 is mounted flat on the first slope 104. On the other hand, the light-emitting element 103 is positioned and mounted on the heat sink 122 mounted on the metal substrate 121, and is in an electric connection state so that power can be supplied. Thereafter, the three-dimensional circuit board main body and the metal board 121 are integrally coupled. The method for fixing the condenser lens 108 and the optical fiber 109 is the same as that in the first embodiment.
[0045]
Note that the ninth embodiment shown in FIG. 12 is a modification of the fifth embodiment shown in FIG. 7, but the fourth, sixth to eighth embodiments described above are modified. By adopting a configuration in which the light emitting element 103 is mounted on the metal substrate 121 via the heat sink 122, the heat dissipation efficiency of the light emitting element 103 is increased as in the case described above, thereby increasing the operation reliability. In addition, by providing separate mounting substrates for the light emitting element and the light receiving element, it is possible to reduce the electrical crosstalk between the wirings of the light emitting element and the light receiving element.
[0046]
FIG. 13 is a side view showing the configuration of the tenth embodiment of the optical transceiver module according to the present invention. In the figure, the same elements as those of the fifth embodiment shown in FIG. A description thereof will be omitted. In the three-dimensional circuit board 101I constituting this embodiment, the front end surface 123 of the light emitting element 103 on the outgoing light side is substantially perpendicular to the bottom surface and is also perpendicular to the optical axis of the outgoing light. Further, the protruding portion 101b on the outgoing light side is notched at the center in the width direction with the optical axis being distributed. A recess into which the condensing lens 108 is fitted is formed at the center of the notch of the front end surface 123 according to the surface shape of the condensing lens 108, and the condensing lens 108 is fixed to the recess with an adhesive.
In this manner, by fixing the condenser lens 108 to the front end surface 123 of the light emitting element 103 on the outgoing light side, it is not necessary to separately provide a holder for the condenser lens 108, thereby simplifying the configuration. .
[0047]
The tenth embodiment shown in FIG. 13 is a modification of the fifth embodiment shown in FIG. 7, but the dimensions on the outgoing light side of the three-dimensional circuit board or the condensing lens 108. By appropriately selecting the focal length, it is possible to obtain the same effect as described above if it is fixed to the tip surface of the three-dimensional circuit board according to another embodiment.
In the tenth embodiment shown in FIG. 13, the condensing lens 108 is fixed to the front end surface of the three-dimensional circuit board 101 using an adhesive, but the condensing lens 108 is fixed to the depression by other methods. May be.
[0048]
FIG. 14 is a side view showing the structure of the eleventh embodiment of the optical transceiver module according to the present invention, partly broken away. This is an assembly of the condensing lens 108 shown separately in the first to ninth embodiments. Here, the three-dimensional circuit board 101 shown in FIG. 7 is housed and stored in a package 124 having input / output pins, and hermetic sealing is performed by the package 124 in order to improve moisture resistance. The condensing lens 108 is installed in the opening window of the package 124 located in the emission direction. However, the height of the package needs to be determined in advance so that the position of the condensing lens 108 is the same as in the first embodiment.
In this way, by installing the condensing lens in the opening window located in the emission direction of the light emitting element of the package storing the three-dimensional circuit board, the hermetically sealing package also functions as a holder for the condensing lens. And the configuration can be simplified.
Note that the three-dimensional circuit board according to another embodiment can be stored in the package 124, and thereby, the same effects as those described above can be obtained.
[0049]
FIG. 15 is a perspective view showing the configuration of an embodiment of an optical transceiver according to the present invention. Although this embodiment can use any of the optical transceiver modules of the first to eleventh embodiments, in particular, the optical transceiver module 125 according to the eleventh embodiment shown in FIG. 14 is used. Shows the case.
Here, one or a plurality of optical transmission / reception modules 125 are mounted on the main resin substrate 126 of the optical transmission apparatus, and are accommodated in the optical transmission / reception apparatus casing 127. An optical fiber connector plug 128 having a function of an optical input / output port is attached to the front panel of the casing 127.
[0050]
As described above, by accommodating the optical transceiver module having the three-dimensional circuit board in the optical transceiver casing, the optical transceiver can be reduced in size, and by mounting a plurality of optical transceiver modules, the multi-port optical transceiver can be obtained. Can be realized.
[0051]
【The invention's effect】
As described above, according to the present invention, at least the light emitting element, the light receiving element, and the optical film member among the light emitting element, the light receiving element, the optical film member, the output monitor light receiving element, and the condenser lens are provided on the three-dimensional circuit board. Since it is housed in one piece, the optical coupling between the light emitting element and the light receiving element and the optical fiber can be realized by only one adjustment using a single condenser lens, and the effect of facilitating downsizing can be obtained. It is done.
[Brief description of the drawings]
FIG. 1 is a side view of a first embodiment of an optical transceiver module according to the present invention.
FIG. 2 is a perspective view of a three-dimensional circuit board on which a semiconductor element for optical transmission / reception constituting the first embodiment shown in FIG. 1 is mounted.
FIG. 3 is a plan view in which a half mirror as an optical film member is mounted on the three-dimensional circuit board of the first embodiment shown in FIG. 1;
FIG. 4 is a side view showing a configuration of a second embodiment of an optical transceiver module according to the present invention.
FIG. 5 is a side view partially showing a configuration of a third embodiment of an optical transceiver module according to the present invention, partially using a cross section;
FIG. 6 is a side view showing a configuration of a fourth embodiment of an optical transceiver module according to the present invention.
FIG. 7 is a side view showing the configuration of the fifth embodiment of the optical transceiver module according to the present invention;
FIG. 8 is a side view showing the configuration of the sixth embodiment of the optical transceiver module according to the present invention;
FIG. 9 is a perspective view of the sixth embodiment shown in FIG.
FIG. 10 is a side view showing the configuration of the seventh embodiment of the optical transceiver module according to the present invention;
FIG. 11 is a side view showing the configuration of the eighth embodiment of the optical transceiver module according to the present invention;
FIG. 12 is a side view showing the configuration of the ninth embodiment of the optical transceiver module according to the present invention;
FIG. 13 is a side view showing the configuration of the tenth embodiment of the optical transceiver module according to the present invention;
FIG. 14 is a side view illustrating a configuration of an eleventh embodiment of an optical transceiver module according to the present invention, partly broken away;
FIG. 15 is a perspective view showing a configuration of an embodiment of an optical transceiver according to the present invention.
FIG. 16 is a schematic configuration diagram of an optical transceiver module in a conventional optical signal transmission system.
[Explanation of symbols]
101A-101I 3D circuit board
102 first plane
103 Light-emitting element for transmission
104 First slope
105 Half mirror (optical film member)
106 Second plane
107 light receiving element
108 Condensing lens
109 optical fiber
110 First wavelength filter
111 protrusions
112 Second wavelength filter
113 Light receiving element for output monitor
114 Second slope
115 third plane
116 Third slope
117 fourth plane
118 Wall
119 wall surface
120 opening
121 Metal substrate
122 heat sink
123 Tip surface of 3D circuit board
124 airtight sealed package
125 Optical transceiver module
126 Main resin board
127 Optical transceiver housing lug
128 optical fiber connector

Claims

In an optical transmission / reception module that transmits and receives light transmitted bidirectionally through an optical fiber at one end of the optical fiber,
Projecting from the base along the traveling path of light to be transmitted / received, a first projection is formed on the side closer to the optical fiber, and a second projection is formed on the side far from the optical fiber, the first projection Has a notch serving as a light traveling path, the second protrusion has a first plane formed lower than the light traveling path by a predetermined dimension, and further includes the first protrusion. Is a second plane formed substantially parallel to the first plane at the bottom of the notch and lower than the first plane, and the second plane on the side facing the second protrusion. A three-dimensional circuit board having a first slope having an acute angle with respect to the plane of
A light emitting element for transmission mounted on the first plane;
A receiving light receiving element mounted on the second plane;
An optical film member mounted on the first slope;
A condensing lens provided in a light traveling path between the optical fiber and the three-dimensional circuit board;
An optical transmission / reception module comprising:

The optical film member is composed of a half mirror, and the light emitted from the light emitting element passes through the half mirror at a certain ratio, is collected by the condenser lens, and enters the optical fiber, and then from the optical fiber. 2. The optical transceiver module according to claim 1, wherein the emitted light is collected by the condenser lens, reflected by the half mirror at a certain ratio, and incident on the light receiving element.

When the optical fiber transmits light having different wavelengths in both directions, the optical film member totally reflects the received light emitted from the optical fiber and collected by the condenser lens to the light receiving element. 2. The optical transmission / reception module according to claim 1, wherein the optical transmission / reception module is a wavelength filter that causes the transmission light incident thereon to pass through, is totally transmitted, is collected by the condenser lens, and is incident on the optical fiber.

4. The light according to claim 3, wherein a frame-shaped protrusion that optically shields the periphery of the light receiving element from the other is provided, and an open end of the protrusion is covered with a wavelength filter that transmits only received light. Transmit / receive module.

The light receiving element, the light receiving sensitivity to the wavelength of the wavelength of the received light said transmitting light is different, has a high light receiving sensitivity to the wavelength of the received light, low in the wavelength of the transmission light 4. The optical transceiver module according to claim 3, wherein the optical transceiver module has high light receiving sensitivity.

The output monitor light receiving element mounted on the first plane of the rear portion of the light emitting element that emits transmission light so as to be able to receive light emitted backward from the light emitting element. The optical transceiver module according to any one of 1 to 5.

The three-dimensional circuit board includes a third protrusion formed on a side farther from the optical fiber than the second protrusion, and the third protrusion faces the light emitting element. 2. A light receiving element for output monitoring having a slope inclined by a predetermined angle with respect to a plane, and mounted on the slope so as to be able to receive light emitted backward from the light emitting element. 5. The optical transceiver module according to any one of 1 to 5.

The three-dimensional circuit board includes a third protrusion formed on a side farther from the optical fiber than the second protrusion, and the third protrusion is higher than a light traveling path by a predetermined dimension. A third plane that is formed and substantially parallel to the first plane and a central portion of the third protrusion that is irradiated with light emitted rearward from the light emitting element are cut out, and the bottom of the cutout includes the first plane. A third inclined surface inclined at an obtuse angle with respect to the first plane and having a reflecting surface formed thereon, and the rear emission light of the light emitting element is formed on the third plane. 6. The optical transmission / reception module according to claim 1, further comprising an output monitor light receiving element mounted so as to be able to receive light reflected by the reflecting surface.

The three-dimensional circuit board is formed on a side farther from the optical fiber than the second protrusion, is substantially parallel to the first plane, and is lower by a predetermined dimension than the first plane. A fourth plane, and a wall portion formed on a side farther from the optical fiber than the fourth plane, and having a reflection surface that faces the light emitting element and is inclined at an acute angle with respect to the first plane. 6. A light receiving element for output monitoring is mounted on the fourth plane so that the light emitted from the rear side of the light emitting element is reflected by the reflecting surface. An optical transceiver module according to any one of the above.

The three-dimensional circuit board is formed on a side farther from the optical fiber than the light emitting element, and includes a wall portion having an opening through which light emitted backward from the light emitting element passes, and the opening is formed on a rear rear surface of the wall portion. The optical transmission / reception module according to claim 1, wherein a light receiving element for output monitoring is mounted so as to be able to receive the backward emitted light passing therethrough.

In an optical transmission / reception module that transmits and receives light transmitted bidirectionally through an optical fiber at one end of the optical fiber,
Projecting from the base along the traveling path of light to be transmitted / received, a first projection is formed on the side closer to the optical fiber, a second projection is formed on the side far from the optical fiber, and the legs and arms A metal substrate in which the leg portion is attached to the rear end portion of the second protrusion with the arm portion facing the optical fiber and the arm portion facing the optical fiber. The arm portion of the substrate has a first plane formed between the first and second protrusions by a predetermined dimension higher than the light traveling path, and the first projecting part is connected to the light traveling path. A second plane formed at the bottom of the notch, substantially parallel to the first plane and lower than the first plane, and the second protrusion. A three-dimensional circuit board having a first inclined surface having an acute angle with respect to the second plane on the side opposite to the second plane;
A light-emitting element for transmission mounted in a traveling path of light under the first plane;
A receiving light receiving element mounted on the second plane;
An optical film member mounted on the first slope;
A condensing lens provided in a light traveling path between the optical fiber and the three-dimensional circuit board;
A light receiving element for output monitoring mounted on the second protrusion and mounted so as to be able to receive light emitted backward from the light emitting element;
An optical transmission / reception module comprising:

The optical transmission / reception module according to claim 1, wherein the condensing lens is fixed to an end face of the three-dimensional circuit board on an optical fiber side.

Covering at least the three-dimensional circuit board on which the light emitting element, the light receiving element, and the optical film member are mounted among the light emitting element, the light receiving element, the optical film member, and the output monitor light receiving element, and opening the optical fiber side of the package The optical transmission / reception module according to claim 1, wherein the condensing lens is provided in a window.

In the mounting method of the optical transceiver module according to claim 1-12,
A first step of mounting and electrically connecting at least the light emitting element and the light receiving element among the light emitting element, the light receiving element, and the output monitoring light receiving element on the three-dimensional circuit board;
A second step of mounting the optical film member and the condenser lens;
A third step of causing the light emitting element to emit light and finely adjusting and fixing the position of the optical fiber so that the coupling efficiency to the optical fiber is the best,
An optical transceiver module mounting method, which is performed in order.

An optical transmission / reception apparatus comprising one or more optical transmission / reception modules according to claim 1.