NO920406L - AA MONITORING MONITORING MONITORING AN OPTICAL CHAIRMAN - Google Patents

AA MONITORING MONITORING MONITORING AN OPTICAL CHAIRMAN

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Publication number
NO920406L
NO920406L NO92920406A NO920406A NO920406L NO 920406 L NO920406 L NO 920406L NO 92920406 A NO92920406 A NO 92920406A NO 920406 A NO920406 A NO 920406A NO 920406 L NO920406 L NO 920406L
Authority
NO
Norway
Prior art keywords
monitoring
monitoring circuit
fiber
chairman
optical
Prior art date
Application number
NO92920406A
Other languages
Norwegian (no)
Other versions
NO920406D0 (en
Inventor
Peter Healey
David William Smith
Original Assignee
British Telecomm
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
Priority claimed from GB898917488A external-priority patent/GB8917488D0/en
Application filed by British Telecomm filed Critical British Telecomm
Publication of NO920406D0 publication Critical patent/NO920406D0/en
Publication of NO920406L publication Critical patent/NO920406L/en

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Abstract

En overvåkningsenhet (1) for å detektere fysisk påvirk- ning på en kommunikasjonsfiber (4) i et transmisjonssystem (2), omfatter en overvåkningskrets (9) koplet til kommunika- sjonsfiberen (4). En del av et signal som sendes langs kommunikasjonsfiberen (4), koples ut av fiberen 4 og inn i overvåkningsenheten (1). Et filter (8) tillater bare en av de to ortogonalt polariserte feltkomponentene å passere gjennom seg til overvåkningskretsen (9). Ved å detektere fluktuasjo- ner i polarisasjons-tilstanden for det filtrerte optiske signalet, tillater overvåkningskretsen (9) at deteksjon av ytre påvirkninger kan bestemmes.A monitoring unit (1) for detecting physical influence on a communication fiber (4) in a transmission system (2) comprises a monitoring circuit (9) coupled to the communication fiber (4). A portion of a signal sent along the communication fiber (4) is unplugged from the fiber 4 and into the monitoring unit (1). A filter (8) allows only one of the two orthogonally polarized field components to pass through it to the monitoring circuit (9). By detecting fluctuations in the polarization state of the filtered optical signal, the monitoring circuit (9) allows detection of external influences to be determined.

NO92920406A 1989-07-31 1992-01-30 AA MONITORING MONITORING MONITORING AN OPTICAL CHAIRMAN NO920406L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898917488A GB8917488D0 (en) 1989-07-31 1989-07-31 A monitor unit for monitoring an optical waveguide
PCT/GB1990/001180 WO1991002416A1 (en) 1989-07-31 1990-07-30 A monitor unit for monitoring an optical waveguide

Publications (2)

Publication Number Publication Date
NO920406D0 NO920406D0 (en) 1992-01-30
NO920406L true NO920406L (en) 1992-03-31

Family

ID=26295685

Family Applications (1)

Application Number Title Priority Date Filing Date
NO92920406A NO920406L (en) 1989-07-31 1992-01-30 AA MONITORING MONITORING MONITORING AN OPTICAL CHAIRMAN

Country Status (1)

Country Link
NO (1) NO920406L (en)

Also Published As

Publication number Publication date
NO920406D0 (en) 1992-01-30

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