WO1998049794A3 - Low loss, optical add/drop wdm node - Google Patents

Low loss, optical add/drop wdm node Download PDF

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Publication number
WO1998049794A3
WO1998049794A3 PCT/SE1998/000801 SE9800801W WO9849794A3 WO 1998049794 A3 WO1998049794 A3 WO 1998049794A3 SE 9800801 W SE9800801 W SE 9800801W WO 9849794 A3 WO9849794 A3 WO 9849794A3
Authority
WO
WIPO (PCT)
Prior art keywords
node
channels
signal
passing
add
Prior art date
Application number
PCT/SE1998/000801
Other languages
French (fr)
Other versions
WO1998049794A2 (en
Inventor
Magnus Sundelin
Original Assignee
Ericsson Telefon Ab L M
Magnus Sundelin
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, Magnus Sundelin filed Critical Ericsson Telefon Ab L M
Priority to AU73562/98A priority Critical patent/AU7356298A/en
Priority to EP98920810A priority patent/EP0979564A2/en
Publication of WO1998049794A2 publication Critical patent/WO1998049794A2/en
Publication of WO1998049794A3 publication Critical patent/WO1998049794A3/en
Priority to US09/429,487 priority patent/US6091869A/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

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.
PCT/SE1998/000801 1997-04-30 1998-04-30 Low loss, optical add/drop wdm node WO1998049794A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
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
US09/429,487 US6091869A (en) 1998-04-30 1999-10-29 Low loss, optical add/drop WDM node

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9701668A SE519255C2 (en) 1997-04-30 1997-04-30 ADD / Drop node for low loss WDM
SE9701668-7 1997-04-30

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US09/429,487 Continuation US6091869A (en) 1998-04-30 1999-10-29 Low loss, optical add/drop WDM node

Publications (2)

Publication Number Publication Date
WO1998049794A2 WO1998049794A2 (en) 1998-11-05
WO1998049794A3 true WO1998049794A3 (en) 1999-02-04

Family

ID=20406822

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000801 WO1998049794A2 (en) 1997-04-30 1998-04-30 Low loss, optical add/drop wdm node

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
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
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
DE69942014D1 (en) 1998-12-08 2010-03-25 Nippon Telegraph & Telephone 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
US6236499B1 (en) 1999-04-15 2001-05-22 Nortel Networks Limited Highly scalable modular optical amplifier based subsystem
US6757098B2 (en) * 1999-04-15 2004-06-29 Nortel Network 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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242802A2 (en) * 1986-04-17 1987-10-28 Nec Corporation Optical-wavelength-division multiplex transmission system with an optical filter for spontaneous emission noise
WO1997006616A1 (en) * 1995-08-04 1997-02-20 Alcatel Alsthom Compagnie Generale D'electricite Improvements in or relating to optical add/drop wavelength division multiplex systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0242802A2 (en) * 1986-04-17 1987-10-28 Nec Corporation Optical-wavelength-division multiplex transmission system with an optical filter for spontaneous emission noise
WO1997006616A1 (en) * 1995-08-04 1997-02-20 Alcatel Alsthom Compagnie Generale D'electricite Improvements in or relating to optical add/drop wavelength division multiplex systems

Also Published As

Publication number Publication date
WO1998049794A2 (en) 1998-11-05
SE9701668D0 (en) 1997-04-30
SE519255C2 (en) 2003-02-04
EP0979564A2 (en) 2000-02-16
SE9701668L (en) 1998-10-31
AU7356298A (en) 1998-11-24

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