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
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)
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 (it) | 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 (it) |
| DE (1) | DE4131009C1 (it) |
| FR (1) | FR2738430B1 (it) |
| GB (1) | GB2303753B (it) |
| IT (1) | IT1269223B (it) |
| NL (1) | NL9101538A (it) |
| SE (1) | SE513651C2 (it) |
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 |
| 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 (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 GB GB9119976A patent/GB2303753B/en not_active Expired - Fee Related
- 1991-09-19 IT ITTO910710A patent/IT1269223B/it active IP Right Grant
- 1991-09-20 CA CA002051913A patent/CA2051913C/fr not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9119976D0 (en) | 1997-01-08 |
| FR2738430A1 (fr) | 1997-03-07 |
| NL9101538A (nl) | 1997-03-03 |
| SE9102563L (sv) | 2000-02-09 |
| GB2303753A (en) | 1997-02-26 |
| IT1269223B (it) | 1997-03-21 |
| CA2051913A1 (en) | 1996-12-06 |
| FR2738430B1 (fr) | 1998-03-13 |
| DE4131009C1 (de) | 1997-05-22 |
| SE513651C2 (sv) | 2000-10-16 |
| ITTO910710A1 (it) | 1993-03-19 |
| GB2303753B (en) | 1997-07-09 |
| CA2051913C (fr) | 1999-02-16 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 0001 | Granted | ||
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19980831 |