WO2000003280A1 - Routeur de longueurs d'ondes pour une transmission de donnees bidirectionnelle optique - Google Patents

Routeur de longueurs d'ondes pour une transmission de donnees bidirectionnelle optique Download PDF

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Publication number
WO2000003280A1
WO2000003280A1 PCT/DE1999/001488 DE9901488W WO0003280A1 WO 2000003280 A1 WO2000003280 A1 WO 2000003280A1 DE 9901488 W DE9901488 W DE 9901488W WO 0003280 A1 WO0003280 A1 WO 0003280A1
Authority
WO
WIPO (PCT)
Prior art keywords
wavelength
coupling
add
filter
subscriber
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/DE1999/001488
Other languages
German (de)
English (en)
Inventor
Nikolaus Schunk
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to JP2000559460A priority Critical patent/JP2002520929A/ja
Priority to GB0031517A priority patent/GB2358305A/en
Publication of WO2000003280A1 publication Critical patent/WO2000003280A1/fr
Anticipated expiration legal-status Critical
Priority to GBGB0100791.3A priority patent/GB0100791D0/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
    • G02B6/2935—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means
    • G02B6/29352—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means in a light guide
    • G02B6/29355—Cascade arrangement of interferometers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
    • G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
    • G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
    • G02B6/29383—Adding and dropping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0209—Multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0215—Architecture aspects
    • H04J14/0216—Bidirectional architectures

Definitions

  • the invention is based on a genus as specified in independent claim 1.
  • a subscriber access network for such a data transmission contains a so-called end exchange, also called CO (central office).
  • CO central office
  • the outputs of a large number of transceivers, which are assigned to the individual subscribers and work with different optical wavelengths, are connected to the inputs of a wavelength router.
  • This provides a wavelength division multiplex at the output, which is fed to the input of a transmission line.
  • the output of the transmission line is connected to the input of a second wavelength router arranged in a cable splitter, which splits the transmitted wavelength division multiplex back into the individual wavelengths for the following subscriber lines.
  • the subscriber lines are again connected to the transceivers assigned to the individual subscribers.
  • the direction of transmission from the central office to the switch is generally referred to as the downstream direction, while the opposite direction from the subscriber to the central office is referred to as the upstream direction.
  • the coupling in of the signal of a subscriber to form the wavelength division multiplex and the coupling out of the signal from the wavelength division multiplex for decomposition into the individual wavelengths for the separate subscriber lines are carried out in a coupling-in / coupling-out filter, which in general and also in the description below with add / drop Filter is called.
  • a coupling-in / coupling-out filter which in general and also in the description below with add / drop Filter is called.
  • Such a filter contains two 3dB couplers, between which there is a reflection grating, in particular a so-called UV-induced Bragg grating, which is tuned to the wavelength of the coupled or decoupled signal.
  • the signal for a subscriber is decoupled in the add / drop filter fed by the transmission line in that the received signal with a certain wavelength is completely reflected on the Bragg grating and can be taken from a connection of the 3dB coupler.
  • the remaining wavelength division multiplex signal without the decoupled signal passes through the add / drop filter and is fed from its connection to the next add / drop filter for decoupling the signal with a different wavelength for the next subscriber.
  • the coupling of a signal for a subscriber to form the wavelength division multiplex takes place in that the signal is fed to the 3dB coupler of the add / drop filter.
  • the signal is completely reflected on the Bragg grating and thus inserted in the wavelength division multiplex running in the upstream direction via the add / drop filter and the transmission line.
  • Wavelength routers are known from the prior art which consist of a series connection of four drop filters (AN Rourke et al., "A low loss 4-channel wavelength demultiplexer based on fiber bragg gratings", Proc. ECOC'96, WeD.1.7 ., 3.151 ff.), Made in fiber technology. It is also known that this arrangement can be implemented in a PLC technology (Planar Lightwave Circuit Technology) (GE Kohnke et al., "Planar waveguide Mach-Zender bandpass filter fabricated with single exposure UV-induced gratings", Proc. OFC '96, ThQ6, pp.277ff).
  • the wavelength router with a large number of add / drop filters connected in series represents a considerable amount of circuitry, especially since an add / drop filter can only be used to couple or couple in the signal with one wavelength for one subscriber.
  • the invention has for its object to reduce the overall circuit complexity for the add / drop filter in the wavelength router. This object is achieved by the invention specified in claim 1.
  • the coupling and decoupling of the signal can take place in the same add / drop filter, ie the filter twice is used without interference or crosstalk between the signals.
  • the wavelength offset between coupling and decoupling effectively decouples these two processes.
  • the transceivers in the subscriber lines are so selectively tuned to a wavelength that interference from an adjacent wavelength cannot occur. If the same wavelength were used in an add / drop filter for the coupled signal and the coupled signal, tolerances in the components, temperature changes, insertion losses and the like would cause unbearable interference and crosstalk.
  • FIG. 1 shows an add / drop filter designed and operated according to the invention
  • FIG. 2 shows a wavelength router with a multiplicity of such add / drop filters connected in series and a bidirectional transmission over two separate fibers
  • FIG. 3 shows a wavelength router with a coupling and decoupling of the signals from or into the add / drop grating and a bidirectional transmission over only one fiber, as compared to FIG. 2,
  • Figure 4 shows a modification of Figure 3, in which the wavelengths for the two directions are not nested and
  • Figure 5 shows a combination of the design with only one subscriber line for each subscriber Tln and with the transmission over two fibers for the two directions.
  • the signal Se to be coupled in with the wavelength ⁇ M is fed to the connection 11, reaches the Bragg gratings 6, 7 via the 3dB coupler 2 and is completely reflected by them in the upstream direction u. It is thus inserted into the wavelength division multiplex already supplied to the connection 10 by the following add / drop filter and transmitted via the line 9 in the upstream direction u.
  • the signal Sa with the wavelength ⁇ i contained in the wavelength division multiplex and to be decoupled from the line 9 is, however, completely reflected on the Bragg gratings 4, 5 and reaches the connection 11 and via the 3dB coupler 2 can be fed from there to the corresponding transceiver for the subscriber with a wavelength ⁇ i.
  • the signals Se and Sa processed in the add / drop filter 1 at the same time each have different wavelengths, and thus interference between these signals, for example in the form of crosstalk, is avoided.
  • the difference between the wavelengths ⁇ j and ⁇ preferably corresponds to a wavelength spacing of the wavelength division multiplex.
  • the wavelengths ⁇ j on the one hand and ⁇ M on the other hand are preferably interleaved or interleaved in the wavelength axis.
  • all wavelengths ⁇ j for the coupling out lie in a first wavelength range and all wavelengths for the coupling in a second wavelength range lying adjacent in the frequency axis.
  • the coupling and decoupling of the signal do not have to take place at the same connection of the add / drop filter as shown in FIG. 1. It is also possible for the signal from a subscriber to be coupled into the wavelength division multiplex at the right end of the add / drop filter via the 3dB coupler 3. Instead of the two reflection filters 4, 5 and 6, 7 matched to the different wavelengths ⁇ j and ⁇ u, a broadband reflection filter can also be used, the bandwidth of which in each case varies over the wavelengths ⁇ and ⁇ ! extends.
  • FIG. 2 shows a wavelength router 14 with a multiplicity of add / drop filters 1 lying in series.
  • the wavelength division multiplex coming from the line or fiber 9a is fed to the first add / drop filter 1a, where the signal with the wavelength ⁇ i for the subscriber TIn 1 is coupled out in the manner described.
  • the wavelength multiplex passing through the add / drop filter 1a without the decoupled signal for TIn 1 then arrives at the next add / drop filter 1b, where the signal with the wavelength ⁇ 2 for the subscriber TIn 2 is decoupled in the same way.
  • the signals with the wavelengths ⁇ -, - ⁇ n for the subscribers TIn 1 to TIn n are output in succession in n add / drop filters 1a to 1n and the supplied to the respective selective transceivers for the individual subscribers TIn 1 - TIn n.
  • the decoupling and coupling of the signal at different connections of the add / drop filter take place in FIG. 2, for example with filter 1a at connections No. 4 and No. 2.
  • the outgoing connecting lines 13 lead from the subscribers TIn 1 to TIn n at the inputs of the wavelength router 14 to the individual add / drop filters 1a-1 n, where the selective signals are coupled in in the manner described and the wavelength division multiplex for transmission generate line 9b in the upstream direction u.
  • the transmission in the down-stream (drop) direction d and in the upstream (add) direction u thus takes place in FIG. 2 via separate fibers 9a and 9b, the wavelength division multiplex for transmission in the upstream direction u at the output (No. 3 ) of the last add / drop filter 1 n.
  • the transmission in the downstream direction d takes place according to FIG. 1 at the wavelengths ⁇ , and the transmission in the upstream direction u at the wavelengths ⁇ . ! .
  • the wavelength of the decoupled signal Sa ⁇ is again that of the coupled signal Se ⁇ , . ⁇ , the wavelength difference between ⁇ , and ⁇ , .-, preferably equal to one Wavelength spacing of the wavelength division multiplex is.
  • This wavelength offset between the decoupled signals for the transmission in the downstream direction d and the coupled signals for the transmission in the upstream direction u in each add / drop filter 1a-1n prevents interference and crosstalk between these signals.
  • FIG. 3 the transmission in the upstream direction u and in the downstream direction d takes place, in contrast to FIG. 2, via a common line or fiber 9, the coupling and the coupling out to the same connection (terminal 4) of each add / as in FIG. Drop filters 1 take place.
  • the bandwidth of the reflection filter extends over two adjacent wavelengths ⁇ , and ⁇ , .- ,, whereby again the wavelengths ⁇ , for the downstream direction and ⁇ for the upstream direction are interleaved or interleaved.
  • Figure 4 shows an embodiment in which the wavelengths ⁇ j for the downstream direction d and ⁇ !
  • the wavelength ranges for the two directions are placed next to one another, that is to say they follow one another in the frequency axis.
  • the coupling takes place at the wavelength ⁇ j + n ⁇ .
  • the bidirectional transmission again takes place via a single fiber 9.
  • the wavelength division multiplex is fed into the wavelength router 14 from the line or fiber 9a in the downstream direction d.
  • the add / drop filters 1 a to 1 n are arranged in the form of a column in the middle and are connected to one another in a meandering manner. No coupling is provided for the first add / drop filter 1 a and no coupling out is provided for the last add / drop filter 1 n.
  • Each subscriber TIn is connected to the wavelength router 14 only via a line for coupling out and coupling in. The transmission for the two directions takes place via two separate fibers 9a and 9b.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optical Communication System (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

Un routeur de longueurs d'ondes pour une transmission de données bidirectionnelle optique contient, pour l'injection des signaux servant à former un signal multiplexé en longueur d'onde et pour l'extraction sélective des signaux servant à la décomposition du signal multiplexé, une pluralité de filtres d'insertion/extraction (1). Un tel routeur de longueurs d'ondes est d'une complexité de circuit importante, cela principalement parce qu'il faut chaque fois un filtre d'insertion/d'extraction pour que le signal d'un abonné puisse être injecté ou extrait. L'objectif de l'invention est de réduire la complexité de circuit dans son ensemble pour un tel routeur de longueurs d'onde. L'extraction et l'injection, pour un abonné, se font chaque fois dans le même filtre d'insertion/extraction (1). Pour éviter une diaphonie, l'extraction se fait à une longueur d'onde lambda i et l'injection se fait à une longueur d'onde décalée à la baisse lambda i-1. La différence de longueur d'onde entre l'injection et l'extraction correspond, de préférence, à un écart de longueur d'onde du signal multiplexé en longueur d'onde.
PCT/DE1999/001488 1998-07-09 1999-05-18 Routeur de longueurs d'ondes pour une transmission de donnees bidirectionnelle optique Ceased WO2000003280A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2000559460A JP2002520929A (ja) 1998-07-09 1999-05-18 光学双方向データ転送のための波長ルータ
GB0031517A GB2358305A (en) 1998-07-09 1999-05-18 Wavelength router for optical bidirectional transmission of data
GBGB0100791.3A GB0100791D0 (en) 1998-07-09 2001-01-11 Wavelength router for optical bidirectional transmission of data

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19830735A DE19830735A1 (de) 1998-07-09 1998-07-09 Wellenlängenrouter für eine optische bidirektionale Datenübertragung
DE19830735.7 1998-07-09

Publications (1)

Publication Number Publication Date
WO2000003280A1 true WO2000003280A1 (fr) 2000-01-20

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PCT/DE1999/001488 Ceased WO2000003280A1 (fr) 1998-07-09 1999-05-18 Routeur de longueurs d'ondes pour une transmission de donnees bidirectionnelle optique

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JP (1) JP2002520929A (fr)
DE (1) DE19830735A1 (fr)
GB (2) GB2358305A (fr)
WO (1) WO2000003280A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100366056B1 (ko) * 2000-08-12 2002-12-27 한국과학기술원 4단자 파장선택 광경로 설정기 및 그를 이용한 양방향 애드/드롭 장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0961649A (ja) * 1995-08-21 1997-03-07 Kokusai Denshin Denwa Co Ltd <Kdd> 光合分波器
EP0814629A2 (fr) * 1996-06-21 1997-12-29 Lucent Technologies Inc. Dispositif d'interconnexion de fibres optiques à routage actif, pour le multiplexage et démultiplexage en longueur d'onde
DE19647789A1 (de) * 1996-11-19 1998-05-20 Alsthom Cge Alcatel Planarer optischer Wellenleiter, Planarer optischer Wellenleiter mit Bragg-Gitter und Herstellungsverfahren hierfür

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0961649A (ja) * 1995-08-21 1997-03-07 Kokusai Denshin Denwa Co Ltd <Kdd> 光合分波器
EP0814629A2 (fr) * 1996-06-21 1997-12-29 Lucent Technologies Inc. Dispositif d'interconnexion de fibres optiques à routage actif, pour le multiplexage et démultiplexage en longueur d'onde
DE19647789A1 (de) * 1996-11-19 1998-05-20 Alsthom Cge Alcatel Planarer optischer Wellenleiter, Planarer optischer Wellenleiter mit Bragg-Gitter und Herstellungsverfahren hierfür

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
CHEUNG K W: "WAVELENGTH-SELECTIVE CIRCUIT AND PACKET SWITCHING USING ACOUSTO- OPTIC TUNABLE FILTERS", COMMUNICATIONS: CONNECTING THE FUTURE, SAN DIEGO, DEC. 2 - 5, 1990, vol. 3, 2 December 1990 (1990-12-02), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 1541 - 1547, XP000218834, ISBN: 0-87942-632-2 *
CULLEN T J ET AL: "COMPACT ALL-FIBRE WAVELENGHT DROP AND INSERT FILTER", ELECTRONICS LETTERS, vol. 30, no. 25, 8 December 1994 (1994-12-08), pages 2160 - 2162, XP000502111, ISSN: 0013-5194 *
KASHYAP R ET AL: "LASER-TRIMMED FOUR-PORT BANDPASS FILTER FABRICATED IN SINGLE-MODE PHOTOSENSITIVE GE-DOPED PLANAR WAVEGUIDE", IEEE PHOTONICS TECHNOLOGY LETTERS, vol. 5, no. 2, 1 February 1993 (1993-02-01), pages 191 - 194, XP000362867, ISSN: 1041-1135 *
MIZUOCHI T ET AL: "INTERFEROMETRIC CROSSTALK-FREE OPTICAL ADD/DROP MULTIPLEXER USING MACH-ZEHNDER-BASED FIBER GRATINGS", JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 16, no. 2, 1 February 1998 (1998-02-01), pages 265 - 276, XP000750668, ISSN: 0733-8724 *
ROURKE H N: "A LOW LOSS 4-CHANNEL WAVELENGTH DEMULTIPLEXER BASED ON BIBRE BRAGG GRATINGS", ECOC'96, vol. 3, 15 September 1996 (1996-09-15) - 19 September 1996 (1996-09-19), OSLO, NORWAY, pages 151 - 154, XP002118836 *

Also Published As

Publication number Publication date
GB0031517D0 (en) 2001-02-07
GB0100791D0 (en) 2001-02-21
DE19830735A1 (de) 2000-01-13
GB2358305A (en) 2001-07-18
JP2002520929A (ja) 2002-07-09

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