GB2273407B - Monitoring of optical communications fibres - Google Patents

Monitoring of optical communications fibres

Info

Publication number
GB2273407B
GB2273407B GB8600583A GB8600583A GB2273407B GB 2273407 B GB2273407 B GB 2273407B GB 8600583 A GB8600583 A GB 8600583A GB 8600583 A GB8600583 A GB 8600583A GB 2273407 B GB2273407 B GB 2273407B
Authority
GB
United Kingdom
Prior art keywords
monitoring
optical communications
fibres
bend
communications
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.)
Expired - Fee Related
Application number
GB8600583A
Other versions
GB8600583D0 (en
GB2273407A (en
Inventor
Alun James Harris
Peter Frank Castle
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB8600583D0 publication Critical patent/GB8600583D0/en
Publication of GB2273407A publication Critical patent/GB2273407A/en
Application granted granted Critical
Publication of GB2273407B publication Critical patent/GB2273407B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/07—Monitoring an optical transmission system using a supervisory signal
    • H04B2210/078—Monitoring an optical transmission system using a supervisory signal using a separate wavelength

Landscapes

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

Abstract

In a device for detecting the presence of a bend (5) used for the illicit tapping of communications through an optical fibre (1) a pilot beam of different frequency from the communications beam is generated by a source (8) and the relative attenuation of the two beams is measured at the receiving end. A change indicates the presence of a bend. <IMAGE>
GB8600583A 1985-01-11 1986-01-10 Monitoring of optical communications fibres Expired - Fee Related GB2273407B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858500728A GB8500728D0 (en) 1985-01-11 1985-01-11 Monitoring of optical communications fibres

Publications (3)

Publication Number Publication Date
GB8600583D0 GB8600583D0 (en) 1994-03-09
GB2273407A GB2273407A (en) 1994-06-15
GB2273407B true GB2273407B (en) 1995-01-18

Family

ID=10572724

Family Applications (2)

Application Number Title Priority Date Filing Date
GB858500728A Pending GB8500728D0 (en) 1985-01-11 1985-01-11 Monitoring of optical communications fibres
GB8600583A Expired - Fee Related GB2273407B (en) 1985-01-11 1986-01-10 Monitoring of optical communications fibres

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB858500728A Pending GB8500728D0 (en) 1985-01-11 1985-01-11 Monitoring of optical communications fibres

Country Status (1)

Country Link
GB (2) GB8500728D0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050174563A1 (en) * 2004-02-11 2005-08-11 Evans Alan F. Active fiber loss monitor and method
CN114884570B (en) * 2022-06-16 2024-01-19 北京泛在云科技有限公司 Optical fiber eavesdropping detection method and device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002632A1 (en) * 1981-01-16 1982-08-05 Western Electric Co An optical communication arrangement for reducing harmonic distortion

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002632A1 (en) * 1981-01-16 1982-08-05 Western Electric Co An optical communication arrangement for reducing harmonic distortion

Also Published As

Publication number Publication date
GB8500728D0 (en) 1994-01-26
GB8600583D0 (en) 1994-03-09
GB2273407A (en) 1994-06-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950418