GB2273407B - Monitoring of optical communications fibres - Google Patents
Monitoring of optical communications fibresInfo
- Publication number
- GB2273407B GB2273407B GB8600583A GB8600583A GB2273407B GB 2273407 B GB2273407 B GB 2273407B GB 8600583 A GB8600583 A GB 8600583A GB 8600583 A GB8600583 A GB 8600583A GB 2273407 B GB2273407 B GB 2273407B
- Authority
- GB
- United Kingdom
- Prior art keywords
- monitoring
- optical communications
- fibres
- bend
- communications
- 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.)
- Expired - Fee Related
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2210/00—Indexing scheme relating to optical transmission systems
- H04B2210/07—Monitoring an optical transmission system using a supervisory signal
- H04B2210/078—Monitoring an optical transmission system using a supervisory signal using a separate wavelength
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
In a device for detecting the presence of a bend (5) used for the illicit tapping of communications through an optical fibre (1) a pilot beam of different frequency from the communications beam is generated by a source (8) and the relative attenuation of the two beams is measured at the receiving end. A change indicates the presence of a bend. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858500728A GB8500728D0 (en) | 1985-01-11 | 1985-01-11 | Monitoring of optical communications fibres |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8600583D0 GB8600583D0 (en) | 1994-03-09 |
GB2273407A GB2273407A (en) | 1994-06-15 |
GB2273407B true GB2273407B (en) | 1995-01-18 |
Family
ID=10572724
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB858500728A Pending GB8500728D0 (en) | 1985-01-11 | 1985-01-11 | Monitoring of optical communications fibres |
GB8600583A Expired - Fee Related GB2273407B (en) | 1985-01-11 | 1986-01-10 | Monitoring of optical communications fibres |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB858500728A Pending GB8500728D0 (en) | 1985-01-11 | 1985-01-11 | Monitoring of optical communications fibres |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8500728D0 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050174563A1 (en) * | 2004-02-11 | 2005-08-11 | Evans Alan F. | Active fiber loss monitor and method |
CN114884570B (en) * | 2022-06-16 | 2024-01-19 | 北京泛在云科技有限公司 | Optical fiber eavesdropping detection method and device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982002632A1 (en) * | 1981-01-16 | 1982-08-05 | Western Electric Co | An optical communication arrangement for reducing harmonic distortion |
-
1985
- 1985-01-11 GB GB858500728A patent/GB8500728D0/en active Pending
-
1986
- 1986-01-10 GB GB8600583A patent/GB2273407B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1982002632A1 (en) * | 1981-01-16 | 1982-08-05 | Western Electric Co | An optical communication arrangement for reducing harmonic distortion |
Also Published As
Publication number | Publication date |
---|---|
GB8500728D0 (en) | 1994-01-26 |
GB8600583D0 (en) | 1994-03-09 |
GB2273407A (en) | 1994-06-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950418 |