SE9701834D0 - An add and drop node for optical communication systems - Google Patents

An add and drop node for optical communication systems

Info

Publication number
SE9701834D0
SE9701834D0 SE9701834A SE9701834A SE9701834D0 SE 9701834 D0 SE9701834 D0 SE 9701834D0 SE 9701834 A SE9701834 A SE 9701834A SE 9701834 A SE9701834 A SE 9701834A SE 9701834 D0 SE9701834 D0 SE 9701834D0
Authority
SE
Sweden
Prior art keywords
node
couplers
power
add
demultiplexers
Prior art date
Application number
SE9701834A
Other languages
Swedish (sv)
Other versions
SE9701834L (en
SE509807C2 (en
Inventor
Robert Batchellor
Dag Bonnedal
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 SE9701834A priority Critical patent/SE509807C2/en
Publication of SE9701834D0 publication Critical patent/SE9701834D0/en
Priority to PCT/SE1998/000905 priority patent/WO1998052314A2/en
Priority to AU75606/98A priority patent/AU7560698A/en
Publication of SE9701834L publication Critical patent/SE9701834L/en
Publication of SE509807C2 publication Critical patent/SE509807C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07955—Monitoring or measuring power
    • 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
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H04J14/0294—Dedicated protection at the optical channel (1+1)
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0011—Construction using wavelength conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0013—Construction using gating amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0015—Construction using splitting combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0041—Optical control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

Landscapes

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

Abstract

An add/drop (7) node for an optical fiber network of WDM type has preamplifiers (21, 23) connected to the input fibers (3, 11). Part of the incoming signal power is tapped off by means of drop couplers or splitters (45, 47). The tapped-off power is provided to demultiplexers (49, 51), one demultiplexer being used for each direction, in which WDM information channels are separated from each other. The output signals of the two demultiplexers which comprise the same wavelength interval are combined in combining couplers (73, 75, 77) and then fed to optoelectrical receivers (15), where the information of the dropped channels is converted to electrical signals. In order to monitor and maintain a satisfactory transmission quality of the signal from the node (7), the optical power in each wavelength channel of the multiplexed light signal transmitted in the network is measured, independently for west and east traffic, by adding splitting couplers (61, 63, 65; 67, 69, 71) to the outputs of the demultiplexers (49, 51). These splitting couplers deflect a portion of the signal power to optical power detectors (53), which provide signals informing on the individual power levels. This design gives a node having a minimum number of multiplexers and also the node has a better performance in failure states. WDM information channels to be added in the node from electro-optical transmitters (17) are combined in a multiplexer (29), the resulting signal being split (31) and provided to add couplers (33, 35) to which also the signals incoming to the node are provided.
SE9701834A 1997-05-15 1997-05-15 Device at add / drop node in a path length multiplexed optical communication system. SE509807C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9701834A SE509807C2 (en) 1997-05-15 1997-05-15 Device at add / drop node in a path length multiplexed optical communication system.
PCT/SE1998/000905 WO1998052314A2 (en) 1997-05-15 1998-05-15 An add and drop node for optical communication systems
AU75606/98A AU7560698A (en) 1997-05-15 1998-05-15 An add and drop node for optical communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9701834A SE509807C2 (en) 1997-05-15 1997-05-15 Device at add / drop node in a path length multiplexed optical communication system.

Publications (3)

Publication Number Publication Date
SE9701834D0 true SE9701834D0 (en) 1997-05-15
SE9701834L SE9701834L (en) 1998-11-16
SE509807C2 SE509807C2 (en) 1999-03-08

Family

ID=20406970

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9701834A SE509807C2 (en) 1997-05-15 1997-05-15 Device at add / drop node in a path length multiplexed optical communication system.

Country Status (3)

Country Link
AU (1) AU7560698A (en)
SE (1) SE509807C2 (en)
WO (1) WO1998052314A2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516316C2 (en) 1999-03-18 2001-12-17 Cisco Systems Sweden Ab Receiver transponder for protected networks
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
US6748175B1 (en) * 1999-06-15 2004-06-08 Lucent Technologies Inc. Optical ring network having enhanced security and reduced loss
EP1143646A1 (en) 2000-04-05 2001-10-10 Telefonaktiebolaget Lm Ericsson Optical communication system with two parallel transmission paths
US7231148B2 (en) 2002-03-28 2007-06-12 Fujitsu Limited Flexible open ring optical network and method
US7076163B2 (en) * 2002-03-27 2006-07-11 Fujitsu Limited Method and system for testing during operation of an open ring optical network
US7116905B2 (en) 2002-03-27 2006-10-03 Fujitsu Limited Method and system for control signaling in an open ring optical network
US7283739B2 (en) 2002-05-29 2007-10-16 Fujitsu Limited Multiple subnets in an optical ring network and method
US7184663B2 (en) 2002-05-29 2007-02-27 Fujitsu Limited Optical ring network with hub node and method
US7283740B2 (en) 2002-05-29 2007-10-16 Fujitsu Limited Optical ring network with optical subnets and method
US7321729B2 (en) * 2003-05-29 2008-01-22 Fujitsu Limited Optical ring network with selective signal regeneration and wavelength conversion
US7483637B2 (en) 2003-11-26 2009-01-27 Fujitsu Limited Optical ring network with optical subnets and method
US20050286896A1 (en) * 2004-06-29 2005-12-29 Fujitsu Limited Hybrid optical ring network
US7120360B2 (en) 2005-01-06 2006-10-10 Fujitsu Limited System and method for protecting traffic in a hubbed optical ring network
GB2427518A (en) * 2005-06-20 2006-12-27 Marconi Comm Ltd Optical add-drop multiplexer in which data input at a plurality of different ports is dropped using a common bank of transponders
EP3249834B1 (en) 2015-04-16 2019-08-14 Huawei Technologies Co., Ltd. Add/drop multiplexer and method for processing signal in add/drop multiplexer

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1234092A (en) * 1990-12-17 1992-07-22 Aster Corporation Optical communication monitoring and control
DE69534360D1 (en) * 1994-02-17 2005-09-08 Toshiba Kk Central source of several wavelengths
GB9516017D0 (en) * 1995-08-04 1995-10-04 Stc Submarine Systems Ltd Optical level control in wavelength add-drop multiplexing branching units
IT1277204B1 (en) * 1995-10-19 1997-11-05 Pirelli S P A Ora Pirelli Cavi TRANSPARENT OPTICAL COMMUNICATION NETWORK WITH SELF-PROTECTED RING

Also Published As

Publication number Publication date
WO1998052314A2 (en) 1998-11-19
SE9701834L (en) 1998-11-16
AU7560698A (en) 1998-12-08
WO1998052314A3 (en) 1999-02-18
SE509807C2 (en) 1999-03-08

Similar Documents

Publication Publication Date Title
US8396361B2 (en) Method for the protection of a passive optical transmission network as well as a passive optical transmission network with a corresponding protection mechanism
SE9701834D0 (en) An add and drop node for optical communication systems
US6198721B1 (en) Method and system for data transmission in a ring network
JP3117018B2 (en) Network equipment
SE9703107L (en) Device and method related to optical transmission
JP2977024B2 (en) Optical circuit for wavelength division multiplexing communication and optical transmission communication system including the same
US6091869A (en) Low loss, optical add/drop WDM node
GB2340326A (en) Optical add-drop multiplexer for adding/dropping groups of wavelengths
US11374673B2 (en) Apparatus and method for coherent optical multiplexing 1+1 protection
US6249620B1 (en) Reconfigurable branching unit for a submarine communications system
SE9701668D0 (en) Low loss, optical add / drop WDM node
CA2235050A1 (en) Wavelength dividing circuit with arrayed-waveguide grating monitor port
RU95111133A (en) Optical communication device
US20050259988A1 (en) Bi-directional optical access network
JP2518021B2 (en) WDM module with monitoring function
KR20000044538A (en) Bidirectional line switching ring network typed 4 lines in wdm system
JPS6281136A (en) Wavelength multiplex optical receiver
KR19980048476A (en) Optical branch coupling device for two-wire bidirectional line transfer ring network
KR100434454B1 (en) Daisy chain wavelength division multiplexing device and daisy chain wavelength division multiplexing system and transmission network utilizing the device
CA2475858A1 (en) Add/drop node for an optical communications network
JP3039430B2 (en) Optical add / drop circuit and optical transmission method
JPH06104868A (en) Wavelength multiplexed optical relay transmission system
KR100908239B1 (en) Channel Pass / Coupling Optical Module and Channel Pass / Coupling Method in OMD Node Using the Same
JPH1022919A (en) Optical branching device
JP3149915B2 (en) WDM optical monitoring system and WDM optical monitoring system

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 9701834-5

Format of ref document f/p: F