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GB8500728D0 - Monitoring of optical communications fibres - Google Patents

Monitoring of optical communications fibres

Info

Publication number
GB8500728D0
GB8500728D0 GB858500728A GB8500728A GB8500728D0 GB 8500728 D0 GB8500728 D0 GB 8500728D0 GB 858500728 A GB858500728 A GB 858500728A GB 8500728 A GB8500728 A GB 8500728A GB 8500728 D0 GB8500728 D0 GB 8500728D0
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.)
Pending
Application number
GB858500728A
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.)
CASTLE PETER F
Original Assignee
CASTLE PETER F
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 CASTLE PETER F filed Critical CASTLE PETER F
Priority to GB858500728A priority Critical patent/GB8500728D0/en
Priority to GB8600583A priority patent/GB2273407B/en
Publication of GB8500728D0 publication Critical patent/GB8500728D0/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
    • H04B10/80—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>
GB858500728A 1985-01-11 1985-01-11 Monitoring of optical communications fibres Pending GB8500728D0 (en)

Priority Applications (2)

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

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 (1)

Publication Number Publication Date
GB8500728D0 true GB8500728D0 (en) 1994-01-26

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 After (1)

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

Country Status (1)

Country Link
GB (2) GB8500728D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114884570A (en) * 2022-06-16 2022-08-09 北京泛在云科技有限公司 Optical fiber eavesdropping detection method and device

Families Citing this family (1)

* 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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4393518A (en) * 1981-01-16 1983-07-12 Bell Telephone Laboratories, Incorporated Optical communication arrangement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114884570A (en) * 2022-06-16 2022-08-09 北京泛在云科技有限公司 Optical fiber eavesdropping detection method and device
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

Also Published As

Publication number Publication date
GB2273407B (en) 1995-01-18
GB2273407A (en) 1994-06-15
GB8600583D0 (en) 1994-03-09

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