[go: up one dir, main page]

WO1999059281A1 - Optical multiplexer and optical demultiplexer - Google Patents

Optical multiplexer and optical demultiplexer Download PDF

Info

Publication number
WO1999059281A1
WO1999059281A1 PCT/DE1999/001305 DE9901305W WO9959281A1 WO 1999059281 A1 WO1999059281 A1 WO 1999059281A1 DE 9901305 W DE9901305 W DE 9901305W WO 9959281 A1 WO9959281 A1 WO 9959281A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
lambda
band
filter
filters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1999/001305
Other languages
German (de)
French (fr)
Inventor
Peter Krummrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AU47678/99A priority Critical patent/AU4767899A/en
Publication of WO1999059281A1 publication Critical patent/WO1999059281A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0307—Multiplexers; Demultiplexers

Definitions

  • Optical transmission systems are increasingly using the long-wavelength multiplex method, in which several channels with different wavelengths are transmitted over the same transmission path. At the beginning of the route, the individual channels must be brought together to form a transmission band, which is divided into individual channels again at the end of the route.
  • the channels are, for example, using a non-wavelength-selective power splitter fiber coupler
  • Demultiplexers that are implemented with 1: N couplers and filters also have high vapors.
  • the object of the invention is to provide optical multiplexers and demultiplexers with low vapors.
  • FIG. 1 shows an optical demultiplexer according to the invention
  • Figure 2 shows an optical multiplexer according to the invention.
  • the demultiplexer DMUX shown in FIG. 1 is designed as a filter cascade which has the structure of a binary tree. Each filter has one input and two outputs, each of which is connected to inputs of filters of the next filter stage. Accordingly, the number of filters doubles in each subsequent stage.
  • An input of the optical DE De ultiplexers DMUX or Fl of the first filter is a transmission band ⁇ - 8 supplied and ⁇ - in a lower sub-band 4 and an upper sub-band ⁇ 5-8 divided up.
  • a second filter FD2 divides the lower sub-band into two further sub-bands ⁇ lf2 and ⁇ 3 , 4 which are adjacent in terms of wavelength; Accordingly, the upper subband is divided in a third filter FD3 into likewise adjacent further adjacent subbands ⁇ 5 , 6 and ⁇ 7 , e.
  • the lower and upper sub-band are thus in each case again lower in another and another upper subband split
  • Wavelength filters can be used as filters, combining a high pass and. correspond to a low pass. It is of course also possible to use filters with bandpass characteristics in whole or in part in order to suppress interference outside the wavelength ranges used.
  • FIG. 2 shows an optical multiplexer MUX, which is also implemented as a filter cascade with the same tree structure. The filters each have two inputs ME1, ME2; ... and an output MA on. The first filter stage FM4 to FM7 is used to combine two adjacent transmission channels ⁇ i, ⁇ 2 ; ⁇ 3 , ⁇ 4 , ... to ⁇ 7 , ⁇ 6 .
  • the number of transmission channels usually corresponds to a power of 2.
  • the optical multiplexer or demultiplexer can of course also be implemented for any number of channels.
  • the filters used are known components, for example from E-TEK Dynamics, ENC. , 1855 Lundy Avenue, San Jose, CA 95131 USA.
  • Demultiplexers and multiplexers can be built modularly and expanded according to the number of transmission channels required. In the simplest case, only two channels, for example ⁇ i and ⁇ 5 , can be transmitted, for which purpose only the filters FM1 and FD1 are required. In a first ER can wide treatment stage with the aid of the filter and FM2 FM5 and FD2 and FD5 four channels, for example, ⁇ : ⁇ 3, ⁇ 5 and ⁇ are 7 / transfer, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

Optical multiplexer (MUX) and optical demultiplexer (DMUX) with a cascade structure according to the principle of a binary tree. In the case of the demultiplexer, a transmission band ( lambda 1-8), is split into a lower partial band ( lambda 1-4) and an upper partial band ( lambda 5-8) in a first optical filter (FD1). The partial bands are split into further partial bands ( lambda 1,2... lambda 7,8) or into transmission channels ( lambda 1- lambda 8). Individual transmission channels are grouped correspondingly in the multiplexer. Low insertion loss and gradual expandability provides additional advantages.

Description

1 Beschreibung 1 description

Optischer Multiplexer und optischer DemultiplexerOptical multiplexer and optical demultiplexer

Optische Ubertragungssysteme nutzen zunehmend das ellenlan- gen-Multiplexverfahren, bei dem mehrere Kanäle mit unterschiedlichen Wellenlangen über dieselbe Übertragungsstrecke übertragen werden. Am Anfang der Strecke m ssen die einzelnen Kanäle zu einem Ubertragungsband zusammengeführt werden, das am Ende der Strecke wieder in einzelne Kanäle aufgeteilt wird.Optical transmission systems are increasingly using the long-wavelength multiplex method, in which several channels with different wavelengths are transmitted over the same transmission path. At the beginning of the route, the individual channels must be brought together to form a transmission band, which is divided into individual channels again at the end of the route.

In bisher eingesetzten Wellenlangenmultiplex-Ubertragungs- systemen werden die Kanäle beispielsweise mit Hilfe eines nicht wellenlangenselektiven Leistungsteiler-FaserkopplersIn wavelength division multiplex transmission systems used to date, the channels are, for example, using a non-wavelength-selective power splitter fiber coupler

(Power Combiner) zusammengef hrt. Diese Komponente laßt sich zwar ohne Anpassung für eine Vielzahl von Wellenlangenkombi- nationen verwenden, ihr Hauptnachteil besteht jedoch m der hohen Emfugedampfung.(Power Combiner) merged. Although this component can be used for a large number of wavelength combinations without adaptation, its main disadvantage lies in the high level of vaporization.

Demultiplexer, die mit l:N-Kopplern und Filtern realisiert werden, weisen ebenfalls hohe Dampfungen auf.Demultiplexers that are implemented with 1: N couplers and filters also have high vapors.

Aufgabe der Erfindung ist es, optische Multiplexer und Demul- tiplexer mit geringen Dampfungen anzugeben.The object of the invention is to provide optical multiplexers and demultiplexers with low vapors.

Diese Aufgabe wird durch die unabhängigen Ansprüche gelost.This task is solved by the independent claims.

Der Vorteil dieser Losung liegt nicht nur m der geringen Emfugedampfung, der Multiplexer oder Demultiplexer kann auch entsprechend den Anforderungen stufenweise weiter ausgebaut werden.The advantage of this solution lies not only in the low level of vaporization, the multiplexer or demultiplexer can also be gradually expanded according to the requirements.

Vorteilhafte Weiterbildungen der Erfindung sind m den Un- teranspruchen angegeben. 2Advantageous developments of the invention are specified in the subclaims. 2

Im Folgenden werden Ausführungsbeispiele der Erfindung anhand von Figuren näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to figures.

Es zeigen:Show it:

Figur 1 einen erfindungsgemäßen optischen Demultiplexer und1 shows an optical demultiplexer according to the invention and

Figur 2 einen erfindungsgemäßen optischen Multiplexer.Figure 2 shows an optical multiplexer according to the invention.

Der in Figur 1 dargestellte Demultiplexer DMUX ist als Filterkaskade ausgeführt, die die Struktur eines binären Baumes aufweist. Jedes Filter weist einen Eingang und zwei Ausgänge auf, die jeweils mit Eingängen von Filtern der nächsten Filterstufe verbunden sind. Entsprechend verdoppelt sich die An- zahl der Filter in jeder folgenden Stufe.The demultiplexer DMUX shown in FIG. 1 is designed as a filter cascade which has the structure of a binary tree. Each filter has one input and two outputs, each of which is connected to inputs of filters of the next filter stage. Accordingly, the number of filters doubles in each subsequent stage.

Einem Eingang DE des optischen De ultiplexers DMUX bzw. des ersten Filters Fl wird ein Übertragungsband λι-8 zugeführt und in ein unteres Teilband λι-4 und ein oberes Teilband λ5-8 auf- geteilt. In der nächsten Filterstufe wird durch ein zweites Filter FD2 das untere Teilband in zwei wellenlängenmäßig benachbarte weitere Teilbänder λlf2 und λ3,4 aufgeteilt; entsprechend wird das obere Teilband in einem dritten Filter FD3 in ebenfalls benachbarte weitere benachbarte Teilbänder λ5,6 und λ7,e aufgeteilt. Das untere und das obere Teilband werden also jeweils wieder in ein weiteres unteres und ein weiteres oberes Teilband aufgeteilt Jedes dieser weiteren Teilbänder wird in einer dritten und hier letzten Filterstufe durch Filter FD4 bis FD7 in jeweils zwei wellenlängenmäßig benachbarte Übertragungskanäle λi, λ2jbis λ7, λ8 aufgeteilt, die an den Ausgängen DA1 bis DA8 abgegeben werden.An input of the optical DE De ultiplexers DMUX or Fl of the first filter is a transmission band λι- 8 supplied and λι- in a lower sub-band 4 and an upper sub-band λ 5-8 divided up. In the next filter stage, a second filter FD2 divides the lower sub-band into two further sub-bands λ lf2 and λ 3 , 4 which are adjacent in terms of wavelength; Accordingly, the upper subband is divided in a third filter FD3 into likewise adjacent further adjacent subbands λ 5 , 6 and λ 7 , e. The lower and upper sub-band are thus in each case again lower in another and another upper subband split Each of these additional subbands .lambda..sub.i in a third and final here filter stage by filters FD4 to FD7 in two wavelength moderately adjacent transmission channels λ 2j to λ 7 , λ 8 , which are output at the outputs DA1 to DA8.

Als Filter können Wellenlängenweichen eingesetzt werden, die der Kombination eines Hochpasses und. eines Tiefpasses ent- sprechen. Selbstverständlich können auch ganz oder teilweise Filter mit Bandpaßcharakter verwendet werden, um Störungen außerhalb der genutzten Wellenlängenbereiche zu unterdrücken. In Figur 2 ist ein optischer Multiplexer MUX dargestellt, der ebenso als Filterkaskade mit der gleichen Baumstruktur realisiert ist. Die Filter weisen jeweils zwei Eingänge ME1, ME2; ... und einen Ausgang MA auf. Die erste Filterstufe FM4 bis FM7 dient zum Zusammenfassen von jeweils zwei benachbarten Übertragungskanälen λi, λ2; λ3, λ4, ... bis λ7, λ6.Wavelength filters can be used as filters, combining a high pass and. correspond to a low pass. It is of course also possible to use filters with bandpass characteristics in whole or in part in order to suppress interference outside the wavelength ranges used. FIG. 2 shows an optical multiplexer MUX, which is also implemented as a filter cascade with the same tree structure. The filters each have two inputs ME1, ME2; ... and an output MA on. The first filter stage FM4 to FM7 is used to combine two adjacent transmission channels λi, λ 2 ; λ 3 , λ 4 , ... to λ 7 , λ 6 .

Die jeweils am Ausgang eines dieser Filter abgegebenen weite- ren Teilbänder λ:, λ2 bis λ7, λ8 werden zu einem unteren Teilband λι-4 und einem oberen Teilband λ5-8 zusammengefasst in den Filtern FM2 und FM3 und in einem ersten Filter FM1 zum Übertragungsband λi-β kombiniert, das am Ausgang MA des Multiple- xers abgegeben wird.The output in each case at the output of this filter weite- ren subbands λ: λ 2 to λ 7, λ 8 are λι- to a lower sub-band 4 and an upper sub-band λ 5-8 summarized in the filters FM2 and FM3, and in a first Filter FM1 combined to the transmission band λi-β, which is delivered at the output MA of the multiple.

Die Anzahl der Übertragungskanäle entspricht meist einer Potenz von 2. Der optische Multiplexer bzw. Demultiplexer kann selbstverständlich auch für beliebige Kanalzahlen realisiert werden.The number of transmission channels usually corresponds to a power of 2. The optical multiplexer or demultiplexer can of course also be implemented for any number of channels.

Die verwendeten Filter sind bekannte Bauelemente, die beispielsweise von der Firma E-TEK Dynamics, ENC . , 1855 Lundy Avenue, San Jose, CA 95131 USA bezogen werden können.The filters used are known components, for example from E-TEK Dynamics, ENC. , 1855 Lundy Avenue, San Jose, CA 95131 USA.

Demultiplexer und Multiplexer können modular aufgebaut werden und entsprechend der Anzahl der benötigten Übertragungskanäle erweitert werden. So können im einfachsten Fall nur zwei Kanäle, beispielsweise λi und λ5 übertragen werden, wozu nur die Filter FM1 und FDl erforderlich sind. In einer ersten Er- weiterungsstufe können mit Hilfe der Filter FM2 und FM5 sowie FD2 und FD5 vier Kanäle, z.B. λ:, λ3, λ5 und λ7/ übertragen werden, usw. Demultiplexers and multiplexers can be built modularly and expanded according to the number of transmission channels required. In the simplest case, only two channels, for example λi and λ 5 , can be transmitted, for which purpose only the filters FM1 and FD1 are required. In a first ER can wide treatment stage with the aid of the filter and FM2 FM5 and FD2 and FD5 four channels, for example, λ: λ 3, λ 5 and λ are 7 / transfer, etc.

Claims

Patentansprüche claims 1. Optischer Wellenlängen-Demultiplexer (DMUX) zum Aufteilen eines Übertragungsbandes (λι-8) in Übertragungskanäle (λι-λ8) , dadurch gekennzeichnet, daß er als Filterkaskade mit optischen Filtern (FD1-FD7) ausgebildet ist, die jeweils einen Eingang und zwei Ausgänge ausweisen, daß ein erstes Filter (FDl) vorgesehen ist, durch das ein Übertragungsband (λι_8) in ein unteres Teilband (λ^) und ein oberes Teilband (λ5-8) aufgeteilt wird, und daß weitere Filter (FD2, FD3; FD4 - FD7 ) vorgesehen sind, durch die die Teilbänder (λlι2, λ5-8) in weitere obere und untere benachbarte Teilbänder (λlf2, λ3,4; λ5,6, λ7/8) oder in ein- zelne Übertragungskanäle (λi, λ2, λ3, ...λ8) aufgeteilt werden.1. Optical wavelength demultiplexer (DMUX) for dividing a transmission band (λι- 8 ) into transmission channels (λι-λ 8 ), characterized in that it is designed as a filter cascade with optical filters (FD1-FD7), each having an input and two outputs identify that a first filter (FDL) is provided, through which a transfer tape (λι_ 8) in a lower sub-band (λ ^) and an upper sub-band (λ 5-8) is divided, and in that further filters (FD2, FD3; FD4 - FD7) are provided, through which the subbands (λ lι2 , λ 5 - 8 ) into further upper and lower adjacent subbands (λ lf2 , λ 3 , 4 ; λ 5 , 6 , λ 7/8 ) or in individual transmission channels (λi, λ 2 , λ 3 , ... λ 8 ) can be divided. 2. Optischer Wellenlängen-Demultiplexer nach Anspruch 1, dadurch gekennzeichnet, daß 2N (N = 2 ,3,4,...) Ausgänge vorgesehen sind.2. Optical wavelength demultiplexer according to claim 1, characterized in that 2 N (N = 2, 3.4, ...) outputs are provided. 3. Optischer Wellenlängen-Demultiplexer nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß er modular aufgebaut und durch mindestens eine Filterstufe (FD4 - FD8) erweiterbar ist.3. Optical wavelength demultiplexer according to claim 1 or claim 2, characterized in that it is modular and expandable by at least one filter stage (FD4 - FD8). 4. Optischer Multiplexer (MUX) zum Zusammenfassen mehrerer Übertragungskanäle (λι~λ8) , dadurch gekennzeichnet, daß er als Filterkaskade mit optischen Filtern (FM1 - FM7 ) ausgebildet ist, die jeweils zwei Eingänge (ME1, ME2; ...) und einen Ausgang aufweisen, daß an den Eingängen der Eingangsfilter (FM4 - FM7) benach- barte Übertragungskanäle (λi, λ2; λ3, λ4; ...) anliegen, die zunächst zu weiteren benachbarten Teilbändern (λ:,2; λ3/4;...) zusammengefaßt werden, 5 daß weitere Filter (FM2, FM3; FMl) vorgesehen sind, durch die die weiteren benachbarten Teilbändern (λι,2; λ3/4;...) zu umfassenderen Teilbändern (λι- ; λ5_8) oder zu einem Übertragungsband (λi-β) zusammengefaßt werden.4. Optical multiplexer (MUX) for combining several transmission channels (λι ~ λ 8 ), characterized in that it is designed as a filter cascade with optical filters (FM1 - FM7), each with two inputs (ME1, ME2; ...) and having an output that at the inputs of the input filter (FM4 - FM7) neigh- bouring transmission channels (.lambda..sub.i, λ 2; λ 3, λ 4 ...) lie, the first λ to another adjacent sub-bands (:, 2; λ 3/4 ; ...) are summarized, 5 that further filters (FM2, FM3; FM1) are provided, through which the further adjacent subbands (λι, 2 ; λ 3/4 ; ...) to form more extensive subbands (λι-; λ 5 _ 8 ) or to a transmission band (λi-β) can be summarized. 5. Optischer Wellenlängen-Multiplexer nach Anspruch 4, dadurch gekennzeichnet, daß 2N (N= 2,3,4...) Eingänge vorgesehen sind.5. Optical wavelength multiplexer according to claim 4, characterized in that 2 N (N = 2,3,4 ...) inputs are provided. 6. Optischer Wellenlängen-Multiplexer nach Anspruch 4 oder Anspruch 5, dadurch gekennzeichnet, daß er modular aufgebaut und durch mindestens eine weitere Filterstufe (FM4-FM7) erweiterbar ist. 6. Optical wavelength multiplexer according to claim 4 or claim 5, characterized in that it has a modular structure and can be expanded by at least one further filter stage (FM4-FM7).
PCT/DE1999/001305 1998-05-12 1999-05-03 Optical multiplexer and optical demultiplexer Ceased WO1999059281A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47678/99A AU4767899A (en) 1998-05-12 1999-05-03 Optical multiplexer and optical demultiplexer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19821245A DE19821245C1 (en) 1998-05-12 1998-05-12 Optical multiplexer and optical demultiplexer
DE19821245.3 1998-05-12

Publications (1)

Publication Number Publication Date
WO1999059281A1 true WO1999059281A1 (en) 1999-11-18

Family

ID=7867517

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/001305 Ceased WO1999059281A1 (en) 1998-05-12 1999-05-03 Optical multiplexer and optical demultiplexer

Country Status (3)

Country Link
AU (1) AU4767899A (en)
DE (1) DE19821245C1 (en)
WO (1) WO1999059281A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6353497B1 (en) 2000-03-03 2002-03-05 Optical Coating Laboratory, Inc. Integrated modular optical amplifier
US6389188B1 (en) 1999-02-23 2002-05-14 Optical Coating Laboratory, Inc. Hybrid wavelength selective optical router and switch
US6792210B1 (en) 1999-08-23 2004-09-14 Optical Coating Laboratory, Inc. Hybrid optical add/drop multiplexing devices
US6885824B1 (en) 2000-03-03 2005-04-26 Optical Coating Laboratory, Inc. Expandable optical array

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005050739B4 (en) * 2005-10-22 2011-07-07 ESA Patentverwertungsagentur Sachsen-Anhalt GmbH, 39114 Demultiplexed polymer fiber transfer receiver and method of making the same
DE102019133096A1 (en) 2019-12-05 2021-06-10 Sick Ag Optoelectronic sensor and method for detecting an object

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997008574A1 (en) * 1995-08-29 1997-03-06 Arroyo Optics, Inc. Wavelength selective grating assisted optical couplers
US5652814A (en) * 1994-12-21 1997-07-29 E-Tek Dynamics, Inc. Integrable fiberoptic coupler and resulting devices and systems
US5748350A (en) * 1996-06-19 1998-05-05 E-Tek Dynamics, Inc. Dense wavelength division multiplexer and demultiplexer devices
WO1998036302A1 (en) * 1997-02-14 1998-08-20 Aofr Pty. Ltd. Optical devices and methods

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4041047A1 (en) * 1990-12-20 1991-11-07 Siemens Ag ARRANGEMENT FOR DEMULTIPLEXING LIGHT OF DIFFERENT WAVELENGTH
DE4302133A1 (en) * 1993-01-27 1994-07-28 Kabelmetal Electro Gmbh Three wavelength multiplexer-demultiplexer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652814A (en) * 1994-12-21 1997-07-29 E-Tek Dynamics, Inc. Integrable fiberoptic coupler and resulting devices and systems
WO1997008574A1 (en) * 1995-08-29 1997-03-06 Arroyo Optics, Inc. Wavelength selective grating assisted optical couplers
US5748350A (en) * 1996-06-19 1998-05-05 E-Tek Dynamics, Inc. Dense wavelength division multiplexer and demultiplexer devices
WO1998036302A1 (en) * 1997-02-14 1998-08-20 Aofr Pty. Ltd. Optical devices and methods

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KUANG-YI WU ET AL: "Self-routing wavelength switches", 1997 DIGEST OF THE IEEE/LEOS SUMMER TOPICAL MEETINGS: VERTICAL-CAVITY LASERS/TECHNOLOGIES FOR A GLOBAL INFORMATION INFRASTRUCTURE/WDM COMPONENTS TECHNOLOGY/ADVANCED SEMICONDUCTOR LASERS AND APPLICATIONS/GALLIUM NITRIDE MATERIALS, PROCESSING, AND DEVI, 1997, New York, NY, USA, IEEE, USA, pages 30 - 31, XP002115273, ISBN: 0-7803-3891-X *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6389188B1 (en) 1999-02-23 2002-05-14 Optical Coating Laboratory, Inc. Hybrid wavelength selective optical router and switch
US6792210B1 (en) 1999-08-23 2004-09-14 Optical Coating Laboratory, Inc. Hybrid optical add/drop multiplexing devices
US6353497B1 (en) 2000-03-03 2002-03-05 Optical Coating Laboratory, Inc. Integrated modular optical amplifier
US6885824B1 (en) 2000-03-03 2005-04-26 Optical Coating Laboratory, Inc. Expandable optical array

Also Published As

Publication number Publication date
DE19821245C1 (en) 2000-03-02
AU4767899A (en) 1999-11-29

Similar Documents

Publication Publication Date Title
DE69535053T2 (en) Tunable optical insertion / branch method and apparatus
DE60202354T2 (en) Apparatus for optical (de) multiplexing and method for (de) multiplexing optical signals
EP0049822A1 (en) Optical wavelength multiplex system
DE69432814T2 (en) Optical bandpass filter
DE69938225T2 (en) Cross-connection device and method for mediating and grouping channels
EP1079248B1 (en) Adjustable add-drop-continue module
WO1999059281A1 (en) Optical multiplexer and optical demultiplexer
EP1971060A1 (en) Controllable optical multiplexer
DE2316436B1 (en) Frequency filter
EP1997345B1 (en) Wavelength-selective switch and method for channel-by-channel switching for a wavelength-selective switch
EP1602188B1 (en) Add-drop device and cross-connect device for wavelength multiplex signals
DE60129936T2 (en) DEVICE AND METHOD FOR WAVELENGTHELECTIVE SWITCHING
EP0766358B1 (en) Fibre amplifier for a plurality of signals of different wavelengths comprising a wavelength demultiplexer and wavelength multiplexer
DE19536230C2 (en) Fiber amplifier for multiple signals with different wavelengths using a Fabry-Perot filter
DE10046585B4 (en) Modular expandable ADD-DROP optical module
DE69934058T2 (en) Device for insertion and removal of a wavelength division multiplexed optical signal
EP0520203B1 (en) Channel selection circuit
EP1077552A2 (en) Arrangement for dropping optical signals
DE102005051292A1 (en) Add-drop device for wavelength-multiplex signal, has series circuit comprising two split filters that are switched at one output, where series circuit uncouples one signal of wavelength multiplex signal
DE10300934B4 (en) Optical filter arrangement for an optical wavelength division multiplex transmission system
DE3819587C1 (en)
DE10116649C2 (en) Device for temporary wiring, in particular emergency wiring, of communication networks
WO2004066534A1 (en) Optical filter arrangement for an optical wavelength multiplex transmission system
DE4203174A1 (en) Channel selection circuit esp. for telecommunication satellite - has ring of switches interconnected with bridging by one out of every three four-position rotary switches
DE102004012492A1 (en) WDMS adjustable drop unit has wavelength selective circuit constructing channel groups for optical amplification and channel filtering

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU CA CN JP RU US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase