BR9912598A - Apparatus method for reduced interference in an optical cdma - Google Patents
Apparatus method for reduced interference in an optical cdmaInfo
- Publication number
- BR9912598A BR9912598A BR9912598-6A BR9912598A BR9912598A BR 9912598 A BR9912598 A BR 9912598A BR 9912598 A BR9912598 A BR 9912598A BR 9912598 A BR9912598 A BR 9912598A
- Authority
- BR
- Brazil
- Prior art keywords
- code
- codes
- light
- data
- decoder
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 3
- 230000003287 optical effect Effects 0.000 title abstract 3
- 239000000835 fiber Substances 0.000 abstract 4
- 230000000295 complement effect Effects 0.000 abstract 1
- 230000001934 delay Effects 0.000 abstract 1
- 239000003607 modifier Substances 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 230000003595 spectral effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/005—Optical Code Multiplex
- H04J14/007—Orthogonal Optical Code Multiplex
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
Patente de Invenção: "MéTODO E APARELHO PARA UMA INTERFERêNCIA REDUZIDA EM UM CDMA óTICO". A presente invenção refere-se a um sistema de comunicações de fibra ótica de usuário múltiplo usa técnicas de acesso múltiplo de divisão de código de espectro amplo para a obtenção de uma melhor utilização de largura de banda. Cada canal do sistema é provido com uma fonte de luz que é modulada de forma temporária e espectral por meio de um codificador. A modulação é realizada primeiro passando o dado através de um modificador de pulso, para a obtenção de um fluxo de pulsos encurtados com um ciclo de carga reduzido. A luz modulada é acoplada a uma fibra, e os dados são recuperados pelo decodificador. A fonte inclui uma fonte de fibra superluminescente, que é dividida múltiplas vezes e amplificada de uma maneira hierárquica, para a produção de uma pluralidade de fontes similares. As fontes similares são descorrelacionadas pela adição de atrasos às fontes diferentes. Cada um dos codificadores inclui uma máscara de codificação, que tem um primeiro código, que codifica o sinal ótico. A luz, codificada espacialmente pela máscara e temporariamente modulada com os dados, é transmitida por uma ligação de fibra com os sinais de outros usuários e recebida por um decodificador. Em cada decodificador, um separador insensível à polarização divide a luz recebida em duas componentes de potência igual, as quais são providas para duas máscaras de decodificação usadas para a decodificação do sinal. Uma das máscaras tem um segundo código idêntico ao primeiro código, e a outra máscara tem um terceiro código complementar ao primeiro código. Os feixes de luz extraídos filtrados pelas máscaras são detectados de forma diferencial, para a geração de um sinal de saída, o qual é posteriormente processado para a recuperação de dados. O sinal elétrico é filtrado com passagem baixa e uma lei eletricamente quadrada é detectada. Os primeiros códigos são selecionados a partir de um conjunto de códigos unipolares, derivados a partir de um conjunto de códigos ortogonais bipolares equilibrados. Os códigos podem ser binários ou analógicos.Invention Patent: "METHOD AND APPARATUS FOR REDUCED INTERFERENCE IN AN OPTICAL CDMA". The present invention relates to a multi-user fiber optic communications system using broad-spectrum code division multiple access techniques to achieve better bandwidth utilization. Each channel of the system is provided with a light source that is temporarily and spectral modulated by means of an encoder. Modulation is performed first by passing the data through a pulse modifier, to obtain a flow of shortened pulses with a reduced charge cycle. The modulated light is coupled to a fiber, and the data is recovered by the decoder. The source includes a source of superluminescent fiber, which is divided multiple times and amplified in a hierarchical manner, to produce a plurality of similar sources. Similar sources are de-correlated by adding delays to different sources. Each of the encoders includes an encoding mask, which has a first code, which encodes the optical signal. The light, spatially coded by the mask and temporarily modulated with the data, is transmitted by a fiber link with the signals of other users and received by a decoder. In each decoder, a polarization insensitive separator divides the received light into two components of equal power, which are provided for two decoding masks used for decoding the signal. One of the masks has a second code identical to the first code, and the other mask has a third code complementary to the first code. The extracted light beams filtered by the masks are detected in a differential way, for the generation of an output signal, which is later processed for data recovery. The electrical signal is filtered with low passage and an electrically square law is detected. The first codes are selected from a set of unipolar codes, derived from a set of balanced bipolar orthogonal codes. The codes can be binary or analog.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12734398A | 1998-07-30 | 1998-07-30 | |
| PCT/US1999/017258 WO2000007317A1 (en) | 1998-07-30 | 1999-07-29 | Method and apparatus for reduced interference in optical cdma |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BR9912598A true BR9912598A (en) | 2002-01-02 |
Family
ID=22429623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BR9912598-6A BR9912598A (en) | 1998-07-30 | 1999-07-29 | Apparatus method for reduced interference in an optical cdma |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1101309A1 (en) |
| JP (1) | JP2002521957A (en) |
| KR (1) | KR20010072120A (en) |
| AU (1) | AU5327899A (en) |
| BR (1) | BR9912598A (en) |
| CA (1) | CA2339113A1 (en) |
| RU (1) | RU2001105929A (en) |
| WO (1) | WO2000007317A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003500894A (en) * | 1999-05-17 | 2003-01-07 | コードストリーム テクノロジーズ コーポレーション | Optical communication system |
| FR2828943B1 (en) | 2001-08-23 | 2003-12-19 | Cit Alcatel | IMPROVED OPTICAL MODULATOR FOR OPTIMIZING NRZ MODULATION |
| US6853445B2 (en) | 2002-01-07 | 2005-02-08 | Motorola, Inc. | Two-dimensional angle of arrival detection device |
| KR100488415B1 (en) * | 2002-10-29 | 2005-05-11 | 한국전자통신연구원 | Optical spectral domain CDMA transmitting apparatus and method with bipolar capacity |
| JPWO2006018952A1 (en) * | 2004-08-20 | 2008-05-08 | 松下電器産業株式会社 | Multimode optical transmission equipment |
| US7773882B2 (en) * | 2005-05-26 | 2010-08-10 | Telcordia Technologies, Inc. | Optical code-routed networks |
| CN102135698A (en) * | 2011-03-15 | 2011-07-27 | 中国工程物理研究院激光聚变研究中心 | Transmission-type all-optical fiber light pulse coder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867290A (en) * | 1996-11-19 | 1999-02-02 | Rdl Commercial Technologies Corporation | High capacity spread spectrum optical communications system |
-
1999
- 1999-07-29 KR KR1020017001291A patent/KR20010072120A/en not_active Withdrawn
- 1999-07-29 EP EP99938889A patent/EP1101309A1/en not_active Withdrawn
- 1999-07-29 WO PCT/US1999/017258 patent/WO2000007317A1/en not_active Ceased
- 1999-07-29 BR BR9912598-6A patent/BR9912598A/en not_active Application Discontinuation
- 1999-07-29 AU AU53278/99A patent/AU5327899A/en not_active Abandoned
- 1999-07-29 JP JP2000563022A patent/JP2002521957A/en active Pending
- 1999-07-29 CA CA002339113A patent/CA2339113A1/en not_active Abandoned
- 1999-07-29 RU RU2001105929/09A patent/RU2001105929A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| AU5327899A (en) | 2000-02-21 |
| JP2002521957A (en) | 2002-07-16 |
| EP1101309A1 (en) | 2001-05-23 |
| RU2001105929A (en) | 2003-01-27 |
| KR20010072120A (en) | 2001-07-31 |
| CA2339113A1 (en) | 2000-02-10 |
| WO2000007317A1 (en) | 2000-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FA10 | Dismissal: dismissal - article 33 of industrial property law | ||
| B11Y | Definitive dismissal - extension of time limit for request of examination expired [chapter 11.1.1 patent gazette] | ||
| B15K | Others concerning applications: alteration of classification |
Ipc: H04J 11/00 (2006.01), H04B 10/50 (2013.0 |