[go: up one dir, main page]

GB9119976D0 - Method and apparatus for transmitting information over an optical fiber with intrusion being detected and/or located - Google Patents

Method and apparatus for transmitting information over an optical fiber with intrusion being detected and/or located

Info

Publication number
GB9119976D0
GB9119976D0 GBGB9119976.0A GB9119976A GB9119976D0 GB 9119976 D0 GB9119976 D0 GB 9119976D0 GB 9119976 A GB9119976 A GB 9119976A GB 9119976 D0 GB9119976 D0 GB 9119976D0
Authority
GB
United Kingdom
Prior art keywords
intrusion
detected
optical fiber
transmitting information
information over
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.)
Granted
Application number
GBGB9119976.0A
Other versions
GB2303753B (en
GB2303753A (en
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.)
Alcatel CIT SA
Nokia Inc
Original Assignee
Alcatel CIT SA
Nokia Inc
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 Alcatel CIT SA, Nokia Inc filed Critical Alcatel CIT SA
Publication of GB9119976D0 publication Critical patent/GB9119976D0/en
Publication of GB2303753A publication Critical patent/GB2303753A/en
Application granted granted Critical
Publication of GB2303753B publication Critical patent/GB2303753B/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)
GB9119976A 1990-09-21 1991-09-19 Method and apparatus for transmitting information over an optical fiber with intrusion being detected and located Expired - Fee Related GB2303753B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9011685A FR2738430B1 (en) 1990-09-21 1990-09-21 METHOD AND DEVICE FOR TRANSMITTING INFORMATION ON FIBER OPTICS WITH INTRUSION DETECTION AND / OR LOCATION

Publications (3)

Publication Number Publication Date
GB9119976D0 true GB9119976D0 (en) 1997-01-08
GB2303753A GB2303753A (en) 1997-02-26
GB2303753B GB2303753B (en) 1997-07-09

Family

ID=9400534

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9119976A Expired - Fee Related GB2303753B (en) 1990-09-21 1991-09-19 Method and apparatus for transmitting information over an optical fiber with intrusion being detected and located

Country Status (7)

Country Link
CA (1) CA2051913C (en)
DE (1) DE4131009C1 (en)
FR (1) FR2738430B1 (en)
GB (1) GB2303753B (en)
IT (1) IT1269223B (en)
NL (1) NL9101538A (en)
SE (1) SE513651C2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6072614A (en) * 1997-08-21 2000-06-06 Nortel Networks Corporation Monitoring induced counterpropagating signals in optical communications systems

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134642A (en) * 1976-04-16 1979-01-16 Northern Telecom Limited Optical fibre with increased security
FR2453403A1 (en) * 1979-04-06 1980-10-31 Bertin & Cie Optical fibre link parasitic connection detector - uses second source whose amplitude and time shifts are memorised
US4386629A (en) * 1980-07-31 1983-06-07 Raychem Corporation Apparatus for internal pipe protection
JPS57118136A (en) * 1981-01-14 1982-07-22 Nippon Telegr & Teleph Corp <Ntt> Fault searching method by optical fiber
CA1205307A (en) * 1981-12-07 1986-06-03 Venkata A. Bhagavatula Low dispersion, low-loss single-mode optical waveguide
EP0117868B1 (en) * 1982-05-06 1989-10-04 Nippon Telegraph and Telephone Corporation Method and device for separating position of fault in light transmission line
GB8709900D0 (en) * 1987-04-27 1987-08-05 British Telecomm Surveillance system
DE3743678A1 (en) * 1987-12-23 1989-07-06 Philips Patentverwaltung OPTICAL BACKFLOW MEASURING DEVICE
JPH0227231A (en) * 1988-07-18 1990-01-30 Nippon Telegr & Teleph Corp <Ntt> Measurement of length-wise distortion for optical fiber
FR2635876B1 (en) * 1988-08-26 1992-10-16 Comp Generale Electricite SINGLE-MODE OPTICAL FIBER PROTECTED AGAINST HACKING OF TRANSMITTED INFORMATION AND TRANSMISSION METHOD USING THE SAME

Also Published As

Publication number Publication date
CA2051913C (en) 1999-02-16
SE513651C2 (en) 2000-10-16
GB2303753B (en) 1997-07-09
FR2738430B1 (en) 1998-03-13
CA2051913A1 (en) 1996-12-06
DE4131009C1 (en) 1997-05-22
NL9101538A (en) 1997-03-03
SE9102563L (en) 2000-02-09
IT1269223B (en) 1997-03-21
ITTO910710A0 (en) 1991-09-19
FR2738430A1 (en) 1997-03-07
GB2303753A (en) 1997-02-26
ITTO910710A1 (en) 1993-03-19

Similar Documents

Publication Publication Date Title
AU7195891A (en) Method for laying optical fiber unit and apparatus therefor
AU1631892A (en) Method for screening optical fiber and apparatus for carrying out method
HK1000532A1 (en) Method and apparatus for drawing optical fibers
EP0619275A3 (en) Method and apparatus for coating optical waveguide fibers.
KR0139547B1 (en) Method and system for optical fiber sensing
EP0405610A3 (en) Optical information recording method and recording apparatus
DE69125314D1 (en) Optical transmission system and method
IL99823A0 (en) Optical inspection method and apparatus
IL96483A0 (en) Optical inspection method and apparatus
IL81605A0 (en) Apparatus and method utilizing an optical fiber for polarizing an optical signal
EP0473425A3 (en) Optical disc apparatus for optically processing information
EP0509737A3 (en) Tip processing method and apparatus for jacketed optical fibres
GB9015800D0 (en) Optical long-path monitoring apparatus
GB2212940B (en) Method and apparatus for blowing an optical fibre member
HK1017785A1 (en) Method and apparatus for transmitting signals in an optical fibre
EP0482943A3 (en) Bidirectional optical transmission method and apparatus therefor
HU9200779D0 (en) Method and device for splitting optical fibres
JPS55159640A (en) Method and apparatus for transmitting signal via optical fiber
EP0301775A3 (en) Method and apparatus for terminating an optical fiber
EP0437417A3 (en) Method and apparatus for optical distance measurement
EP0612977A3 (en) Method and apparatus for determining the fiber orientation of paper.
AU660294B2 (en) Optical fiber connector apparatus and method
EP0660143A3 (en) Coupling apparatus between an optical fibre and optical waveguide.
EP0459153A3 (en) Optical fiber display apparatus, fixing device for optical fiber used therein, and decorative optical fiber usable therein
EP0464898A3 (en) An optical data processing device

Legal Events

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

Effective date: 20020919