ITTO910710A0 - - Google Patents

Info

Publication number
ITTO910710A0
ITTO910710A0 IT91TO710A ITTO910710A ITTO910710A0 IT TO910710 A0 ITTO910710 A0 IT TO910710A0 IT 91TO710 A IT91TO710 A IT 91TO710A IT TO910710 A ITTO910710 A IT TO910710A IT TO910710 A0 ITTO910710 A0 IT TO910710A0
Authority
IT
Italy
Application number
IT91TO710A
Other languages
Italian (it)
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 filed Critical
Publication of ITTO910710A0 publication Critical patent/ITTO910710A0/it
Publication of ITTO910710A1 publication Critical patent/ITTO910710A1/it
Application granted granted Critical
Publication of IT1269223B publication Critical patent/IT1269223B/it

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80Optical 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
    • H04B10/85Protection 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)
ITTO910710A 1990-09-21 1991-09-19 Procedimento e dispositivo per la trasmissione di informazioni su fibra ottica IT1269223B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9011685A FR2738430B1 (fr) 1990-09-21 1990-09-21 Procede et dispositif de transmission d'information sur fibre optique avec detection et/ou localisation d'intrusion

Publications (3)

Publication Number Publication Date
ITTO910710A0 true ITTO910710A0 (en:Method) 1991-09-19
ITTO910710A1 ITTO910710A1 (it) 1993-03-19
IT1269223B IT1269223B (it) 1997-03-21

Family

ID=9400534

Family Applications (1)

Application Number Title Priority Date Filing Date
ITTO910710A IT1269223B (it) 1990-09-21 1991-09-19 Procedimento e dispositivo per la trasmissione di informazioni su fibra ottica

Country Status (7)

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

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 (fr) * 1979-04-06 1980-10-31 Bertin & Cie Procede et dispositif de verification d'une fibre optique transmettant une information
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
DE3380681D1 (en) * 1982-05-06 1989-11-09 Nippon Telegraph & Telephone 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 (de) * 1987-12-23 1989-07-06 Philips Patentverwaltung Optisches rueckstreumessgeraet
JPH0227231A (ja) * 1988-07-18 1990-01-30 Nippon Telegr & Teleph Corp <Ntt> 光ファイバ長手方向ひずみ測定方法
FR2635876B1 (fr) * 1988-08-26 1992-10-16 Comp Generale Electricite Fibre optique monomode protegee contre le detournement d'informations transmises et procede de transmission utilisant cette fibre

Also Published As

Publication number Publication date
CA2051913C (fr) 1999-02-16
GB2303753A (en) 1997-02-26
SE9102563L (sv) 2000-02-09
NL9101538A (nl) 1997-03-03
ITTO910710A1 (it) 1993-03-19
CA2051913A1 (en) 1996-12-06
GB9119976D0 (en) 1997-01-08
FR2738430A1 (fr) 1997-03-07
SE513651C2 (sv) 2000-10-16
DE4131009C1 (de) 1997-05-22
GB2303753B (en) 1997-07-09
FR2738430B1 (fr) 1998-03-13
IT1269223B (it) 1997-03-21

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19980831