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SE9701668D0 - Low loss, optical add / drop WDM node - Google Patents

Low loss, optical add / drop WDM node

Info

Publication number
SE9701668D0
SE9701668D0 SE9701668A SE9701668A SE9701668D0 SE 9701668 D0 SE9701668 D0 SE 9701668D0 SE 9701668 A SE9701668 A SE 9701668A SE 9701668 A SE9701668 A SE 9701668A SE 9701668 D0 SE9701668 D0 SE 9701668D0
Authority
SE
Sweden
Prior art keywords
node
channels
signal
passing
add
Prior art date
Application number
SE9701668A
Other languages
Swedish (sv)
Other versions
SE519255C2 (en
SE9701668L (en
Inventor
Magnus Sundelin
Original Assignee
Ericsson Telefon Ab L M
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 Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Priority to SE9701668A priority Critical patent/SE519255C2/en
Publication of SE9701668D0 publication Critical patent/SE9701668D0/en
Priority to PCT/SE1998/000801 priority patent/WO1998049794A2/en
Priority to AU73562/98A priority patent/AU7356298A/en
Priority to EP98920810A priority patent/EP0979564A2/en
Publication of SE9701668L publication Critical patent/SE9701668L/en
Publication of SE519255C2 publication Critical patent/SE519255C2/en

Links

Classifications

    • 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
    • H04J14/0204—Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or 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
    • H04J14/0205—Select and combine arrangements, e.g. with an optical combiner at the output after adding or 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
    • H04J14/0206—Express channels arrangements
    • 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
    • H04J14/0213—Groups of channels or wave bands arrangements

Landscapes

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

Abstract

An add/drop (7) node for an optical fiber network of WDM type has preamplifiers (19, 21) connected to the input fibers (3, 11). Part of the incoming signal power is tapped off by means of drop couplers or splitters (47, 49) and the tapped-off power is provided to a demultiplexer (51) where WDM information channels to be extracted from the network in the node are separated from each other and then fed to opto-electrical receivers (15). WDM information channels to be added in the node from electro-optical transmitters (17) are first combined in a multiplexer (61), the resulting signal being provided to add couplers (57, 59) to which also the signals incoming to the node are provided so that a combined signal is obtained for transmission to the opposite side of the node (7). Channels are thus added in the node to channels passing substantially ininterruptedly through the node. In order to have a low attenuation of the passing signals, the power per channel in the added signal is given approximately the same level as the power of each passing channel by an optical amplifier (65, 67) arranged in the input line to the add coupler from the multiplexer (61). By this arrangement it is possible to maintain a low attenuation of the passing signals within the optical add/drop node, since no extra attenuating devices are needed for the light signal containing the passing channels. The signal to noise ratio of these channels can thus be kept high.
SE9701668A 1997-04-30 1997-04-30 ADD / Drop node for low loss WDM SE519255C2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9701668A SE519255C2 (en) 1997-04-30 1997-04-30 ADD / Drop node for low loss WDM
PCT/SE1998/000801 WO1998049794A2 (en) 1997-04-30 1998-04-30 Low loss, optical add/drop wdm node
AU73562/98A AU7356298A (en) 1997-04-30 1998-04-30 Low loss, optical add/drop wdm node
EP98920810A EP0979564A2 (en) 1997-04-30 1998-04-30 Low loss, optical add/drop wdm node

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9701668A SE519255C2 (en) 1997-04-30 1997-04-30 ADD / Drop node for low loss WDM

Publications (3)

Publication Number Publication Date
SE9701668D0 true SE9701668D0 (en) 1997-04-30
SE9701668L SE9701668L (en) 1998-10-31
SE519255C2 SE519255C2 (en) 2003-02-04

Family

ID=20406822

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9701668A SE519255C2 (en) 1997-04-30 1997-04-30 ADD / Drop node for low loss WDM

Country Status (4)

Country Link
EP (1) EP0979564A2 (en)
AU (1) AU7356298A (en)
SE (1) SE519255C2 (en)
WO (1) WO1998049794A2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE520876C2 (en) * 1998-06-10 2003-09-09 Ericsson Telefon Ab L M ADD / Drpo node for an optical WDM network that has traffic only between neighboring nodes
SE520943C2 (en) * 1998-06-10 2003-09-16 Ericsson Telefon Ab L M Add / drop node arranged to be connected in a wdm-type fiber optic network
US6626590B1 (en) 1998-12-08 2003-09-30 Nippon Telegraph And Telephone Corporation Optical communication network
US6377392B1 (en) 1999-02-26 2002-04-23 Ciena Corporation Optical amplifier
US6509986B1 (en) * 1999-02-26 2003-01-21 Ciena Corporation WDM ring transmission system having amplified dropped channels
JP4044253B2 (en) * 1999-04-05 2008-02-06 株式会社東芝 Optical add / drop node equipment
US6757098B2 (en) * 1999-04-15 2004-06-29 Nortel Network Limited Highly scalable modular optical amplifier based subsystem
US6236499B1 (en) 1999-04-15 2001-05-22 Nortel Networks Limited Highly scalable modular optical amplifier based subsystem
GB2352104B (en) * 1999-07-15 2003-01-15 Marconi Comm Ltd Communications systems
EP1133082A1 (en) * 2000-03-10 2001-09-12 Corning Incorporated Optical monitoring system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0681119B2 (en) * 1986-04-17 1994-10-12 日本電気株式会社 WDM optical transmission system
GB9516017D0 (en) * 1995-08-04 1995-10-04 Stc Submarine Systems Ltd Optical level control in wavelength add-drop multiplexing branching units

Also Published As

Publication number Publication date
EP0979564A2 (en) 2000-02-16
SE519255C2 (en) 2003-02-04
WO1998049794A3 (en) 1999-02-04
AU7356298A (en) 1998-11-24
WO1998049794A2 (en) 1998-11-05
SE9701668L (en) 1998-10-31

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Legal Events

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