SE513651C2 - Förfarande och apparat för att överföra information via en optisk fiber, varvid störning detekteras och/eller lokaliseras - Google Patents
Förfarande och apparat för att överföra information via en optisk fiber, varvid störning detekteras och/eller lokaliserasInfo
- Publication number
- SE513651C2 SE513651C2 SE9102563A SE9102563A SE513651C2 SE 513651 C2 SE513651 C2 SE 513651C2 SE 9102563 A SE9102563 A SE 9102563A SE 9102563 A SE9102563 A SE 9102563A SE 513651 C2 SE513651 C2 SE 513651C2
- Authority
- SE
- Sweden
- Prior art keywords
- wave
- auxiliary
- link
- main
- test signal
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 20
- 239000013307 optical fiber Substances 0.000 title description 5
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 230000003287 optical effect Effects 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 14
- 238000010168 coupling process Methods 0.000 claims description 14
- 238000005859 coupling reaction Methods 0.000 claims description 14
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 abstract description 38
- 238000001514 detection method Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002168 optical frequency-domain reflectometry Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005577 local transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000001850 reproductive effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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)
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 (2)
| Publication Number | Publication Date |
|---|---|
| SE9102563L SE9102563L (sv) | 2000-02-09 |
| SE513651C2 true SE513651C2 (sv) | 2000-10-16 |
Family
ID=9400534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE9102563A SE513651C2 (sv) | 1990-09-21 | 1991-09-06 | Förfarande och apparat för att överföra information via en optisk fiber, varvid störning detekteras och/eller lokaliseras |
Country Status (7)
| Country | Link |
|---|---|
| CA (1) | CA2051913C (cs) |
| DE (1) | DE4131009C1 (cs) |
| FR (1) | FR2738430B1 (cs) |
| GB (1) | GB2303753B (cs) |
| IT (1) | IT1269223B (cs) |
| NL (1) | NL9101538A (cs) |
| SE (1) | SE513651C2 (cs) |
Families Citing this family (1)
| 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)
| 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 |
| WO1983004150A1 (fr) * | 1982-05-06 | 1983-11-24 | Nippon Telegraph And Telephone Public Corporation | Procede et dispositif de detection de points defaillants dans une ligne de transmission de lumiere |
| 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 |
-
1990
- 1990-09-21 FR FR9011685A patent/FR2738430B1/fr not_active Expired - Fee Related
-
1991
- 1991-09-06 SE SE9102563A patent/SE513651C2/sv not_active IP Right Cessation
- 1991-09-12 NL NL9101538A patent/NL9101538A/nl not_active Application Discontinuation
- 1991-09-18 DE DE4131009A patent/DE4131009C1/de not_active Expired - Fee Related
- 1991-09-19 IT ITTO910710A patent/IT1269223B/it active IP Right Grant
- 1991-09-19 GB GB9119976A patent/GB2303753B/en not_active Expired - Fee Related
- 1991-09-20 CA CA002051913A patent/CA2051913C/fr not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO910710A0 (cs) | 1991-09-19 |
| NL9101538A (nl) | 1997-03-03 |
| GB2303753B (en) | 1997-07-09 |
| GB2303753A (en) | 1997-02-26 |
| DE4131009C1 (de) | 1997-05-22 |
| CA2051913C (fr) | 1999-02-16 |
| CA2051913A1 (en) | 1996-12-06 |
| IT1269223B (it) | 1997-03-21 |
| FR2738430A1 (fr) | 1997-03-07 |
| GB9119976D0 (en) | 1997-01-08 |
| SE9102563L (sv) | 2000-02-09 |
| ITTO910710A1 (it) | 1993-03-19 |
| FR2738430B1 (fr) | 1998-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |