CA2051913A1 - Process and device for transmitting informations over optical fibers with detection and/or localization of intrusions - Google Patents

Process and device for transmitting informations over optical fibers with detection and/or localization of intrusions

Info

Publication number
CA2051913A1
CA2051913A1 CA2051913A CA2051913A CA2051913A1 CA 2051913 A1 CA2051913 A1 CA 2051913A1 CA 2051913 A CA2051913 A CA 2051913A CA 2051913 A CA2051913 A CA 2051913A CA 2051913 A1 CA2051913 A1 CA 2051913A1
Authority
CA
Canada
Prior art keywords
intrusions
localization
wave
detection
optical fibers
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
CA2051913A
Other languages
French (fr)
Other versions
CA2051913C (en
Inventor
Jacques Auge
Jose Chesnoy
Philippe Darbon
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
Original Assignee
Alcatel CIT SA
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 filed Critical Alcatel CIT SA
Publication of CA2051913A1 publication Critical patent/CA2051913A1/en
Application granted granted Critical
Publication of CA2051913C publication Critical patent/CA2051913C/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)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Comme connu en soi on injecte sur une fibre de liaison (14) une onde principale (OP) porteuse d'information et une onde auxiliaire (OA) choisie pour se coupler plus facilement avec l'extérieur que cette onde principale. Selon l'invention on applique à cette onde auxiliaire une modulation de test dont on mesure la phase (A) sur l'onde (OR) rétrodiffusée par la fibre.
L'invention s'applique à la transmission d'informations confidentielles As known per se, a bonding fiber (14) is injected main wave (OP) carrying information and an auxiliary wave (OA) chosen to couple more easily with the outside than this main wave. According to the invention, this wave is applied auxiliary a test modulation whose phase (A) is measured on the wave (OR) backscattered by the fiber.
The invention applies to the transmission of information confidential

CA002051913A 1990-09-21 1991-09-20 Process and device for transmitting informations over optical fibers with detection and/or localization of intrusions Expired - Fee Related CA2051913C (en)

Applications Claiming Priority (2)

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
FR9011685 1990-09-21

Publications (2)

Publication Number Publication Date
CA2051913A1 true CA2051913A1 (en) 1996-12-06
CA2051913C CA2051913C (en) 1999-02-16

Family

ID=9400534

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002051913A Expired - Fee Related CA2051913C (en) 1990-09-21 1991-09-20 Process and device for transmitting informations over optical fibers with detection and/or localization of intrusions

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
GB9119976D0 (en) 1997-01-08
FR2738430A1 (en) 1997-03-07
NL9101538A (en) 1997-03-03
SE9102563L (en) 2000-02-09
GB2303753A (en) 1997-02-26
ITTO910710A0 (en) 1991-09-19
IT1269223B (en) 1997-03-21
FR2738430B1 (en) 1998-03-13
DE4131009C1 (en) 1997-05-22
SE513651C2 (en) 2000-10-16
ITTO910710A1 (en) 1993-03-19
GB2303753B (en) 1997-07-09
CA2051913C (en) 1999-02-16

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