GB9025304D0 - Optical transmission monitoring - Google Patents

Optical transmission monitoring

Info

Publication number
GB9025304D0
GB9025304D0 GB909025304A GB9025304A GB9025304D0 GB 9025304 D0 GB9025304 D0 GB 9025304D0 GB 909025304 A GB909025304 A GB 909025304A GB 9025304 A GB9025304 A GB 9025304A GB 9025304 D0 GB9025304 D0 GB 9025304D0
Authority
GB
United Kingdom
Prior art keywords
link
optical transmission
optical
transmission monitoring
receiver
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.)
Pending
Application number
GB909025304A
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.)
Telent Technologies Services Ltd
Plessey Telecommunications Ltd
Original Assignee
Telent Technologies Services Ltd
Plessey Telecommunications Ltd
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 Telent Technologies Services Ltd, Plessey Telecommunications Ltd filed Critical Telent Technologies Services Ltd
Priority to GB909025304A priority Critical patent/GB9025304D0/en
Publication of GB9025304D0 publication Critical patent/GB9025304D0/en
Priority to GB9124574A priority patent/GB2253533B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]

Abstract

A method of testing an optical transmission link comprising the steps of transmitting a first optical communications signal from one end B of the link along an optical fibre to the other end A of the link, returning a predetermined part of said first optical signal using wavelength independent means NTU to said one end of the link and to a first receiver thereat and monitoring the returned signal received at the first receiver. <IMAGE>
GB909025304A 1990-11-21 1990-11-21 Optical transmission monitoring Pending GB9025304D0 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB909025304A GB9025304D0 (en) 1990-11-21 1990-11-21 Optical transmission monitoring
GB9124574A GB2253533B (en) 1990-11-21 1991-11-20 Optical transmission monitoring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB909025304A GB9025304D0 (en) 1990-11-21 1990-11-21 Optical transmission monitoring

Publications (1)

Publication Number Publication Date
GB9025304D0 true GB9025304D0 (en) 1991-01-02

Family

ID=10685735

Family Applications (2)

Application Number Title Priority Date Filing Date
GB909025304A Pending GB9025304D0 (en) 1990-11-21 1990-11-21 Optical transmission monitoring
GB9124574A Expired - Fee Related GB2253533B (en) 1990-11-21 1991-11-20 Optical transmission monitoring

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB9124574A Expired - Fee Related GB2253533B (en) 1990-11-21 1991-11-20 Optical transmission monitoring

Country Status (1)

Country Link
GB (2) GB9025304D0 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2641674B2 (en) * 1992-05-28 1997-08-20 国際電信電話株式会社 Fault location method and apparatus for optical repeater system and optical repeater
JP2968394B2 (en) * 1992-06-10 1999-10-25 ケイディディ株式会社 Monitoring method of optical repeater system, return circuit, and transmission / reception circuit
JP3132638B2 (en) * 1995-08-08 2001-02-05 日本電気株式会社 Optical WDM transmission system
JP2748908B2 (en) * 1995-10-19 1998-05-13 日本電気株式会社 Optical transmission line characteristic measuring method and apparatus, and optical wavelength multiplex transmission method and apparatus
JP3055452B2 (en) * 1996-01-10 2000-06-26 日本電気株式会社 Optical transmission line monitoring method
WO2012048975A1 (en) * 2010-10-13 2012-04-19 Telefonaktiebolaget L M Ericsson (Publ) Determining asymmetries in a communication network

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3380681D1 (en) * 1982-05-06 1989-11-09 Nippon Telegraph & Telephone Method and device for separating position of fault in light transmission line
DE3224998A1 (en) * 1982-07-03 1984-01-05 Philips Kommunikations Industrie AG, 8500 Nürnberg DEVICE DETECTING DEVICE IN AN OPTICAL MESSAGE TRANSMISSION SYSTEM
EP0111582B1 (en) * 1982-12-18 1986-10-22 ANT Nachrichtentechnik GmbH Fault locating arrangement for an optical fibre cable link
SE458328B (en) * 1987-07-16 1989-03-13 Ericsson Telefon Ab L M DEVICE FOR COMMON LOCATION IN A DOUBLE-DIRECT OPTICAL LINE LINK
JPH0828680B2 (en) * 1987-07-23 1996-03-21 国際電信電話株式会社 Failure point monitoring method for bidirectional optical fiber communication system

Also Published As

Publication number Publication date
GB2253533A (en) 1992-09-09
GB2253533B (en) 1994-09-07
GB9124574D0 (en) 1992-01-08

Similar Documents

Publication Publication Date Title
HU910315D0 (en) Process for signal transmission on optical fibre
WO2003007024A3 (en) Fiber optic telecommunications card with security detection
DE58908763D1 (en) Transceiver part for a bidirectional coherent optical transmission system.
CA2088459A1 (en) System for optically transmitting digital communications over an optical fiber with dispersion at the operating wavelength
EP0889562A3 (en) Bidirectional optical telecommunication system comprising a bidirectional optical amplifier
DE529104T1 (en) REMOTE TRANSMISSION SYSTEM.
FR2681203B1 (en) OPTICAL TRANSMISSION SYSTEM, AND OPTICAL TRANSMITTER AND RECEIVER.
EP0233617A3 (en) Optical send and receive module
EP0782290A3 (en) Optical communication method and optical communication system
ATE100946T1 (en) OPTELECTRICAL TRANSMITTER AND RECEIVER DEVICE.
CA2172431A1 (en) Output light wavelength control method in optical communication system for transmitting optical signal output from optical transmitter, optical transmitter and optical transmitter/receiver used in the optical communication system, and optical communication system using the same
EP0361368A3 (en) Light signal transmission system
EP1215836A3 (en) Wavelength agile optical transponder for bi-directional, single fiber WDM system testing
ES2155961T3 (en) OPTICAL SYSTEM WITH ONE OR MORE STABILIZED LASER SIGNAL SOURCES.
EP0845882A3 (en) A passive optical network transceiver circuit
GB2253533B (en) Optical transmission monitoring
CA2040756A1 (en) Long range bidirectional optical fiber communication link
HU912965D0 (en) Method for bidirectional data transfer and bidirectional communication system effectuating said method
IL145338A0 (en) Atmospheric optical communication
KR920011114A (en) Remote measurement method and transmission / reception station
DE59307745D1 (en) Transceiver circuit in a passive optical telecommunication system
EP0389165A3 (en) Fiber optic data link system
NO901316D0 (en) COMMUNICATION SYSTEM, PRINCIPLES BASED ON OPTICAL TRANSMISSION SYSTEM.
EP0876010A3 (en) Optical transmitting apparatus, optical receiving apparatus, and optical transmitting-receiving system
NZ330704A (en) Optical fibre telecommunications system, fibre has dispersion compensator between fibre and receiver