GB2326041B - Optical receiving apparatus - Google Patents
Optical receiving apparatusInfo
- Publication number
- GB2326041B GB2326041B GB9819054A GB9819054A GB2326041B GB 2326041 B GB2326041 B GB 2326041B GB 9819054 A GB9819054 A GB 9819054A GB 9819054 A GB9819054 A GB 9819054A GB 2326041 B GB2326041 B GB 2326041B
- Authority
- GB
- United Kingdom
- Prior art keywords
- optical signal
- optical
- receiving apparatus
- signal
- modulated
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
-
- 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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
-
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/2931—Signal power control using AGC
-
- 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
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
An optical receiving apparatus comprising an optical branching device for separating an optical signal, containing a main optical signal and spontaneously emitted light modulated with an auxiliary signal, into a first optical signal containing the main optical signal and a second optical signal containing the modulated spontaneously emitted light; and demodulating means for performing demodulation to recover the auxiliary signal from the second optical signal. The optical branching device is an optical wavelength-division demultiplexer for separating the optical signal into the first optical signal containing the main optical signal and the second optical signal containing the modulated spontaneously emitted light but substantially not containing the main optical signal. A transmission system including the receiving apparatus is also disclosed.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6138479A JPH088835A (en) | 1994-06-21 | 1994-06-21 | Optical transmission system |
GB9503029A GB2290670B (en) | 1994-06-21 | 1995-02-16 | Auxiliary-signal transmission system |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9819054D0 GB9819054D0 (en) | 1998-10-28 |
GB2326041A GB2326041A (en) | 1998-12-09 |
GB2326041B true GB2326041B (en) | 1999-01-20 |
Family
ID=26306512
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9818894A Expired - Fee Related GB2326548B (en) | 1994-06-21 | 1995-02-16 | Optical transmission apparatus |
GB9819054A Expired - Fee Related GB2326041B (en) | 1994-06-21 | 1995-02-16 | Optical receiving apparatus |
GB9819053A Expired - Fee Related GB2326040B (en) | 1994-06-21 | 1995-02-16 | Optical receiving apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9818894A Expired - Fee Related GB2326548B (en) | 1994-06-21 | 1995-02-16 | Optical transmission apparatus |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9819053A Expired - Fee Related GB2326040B (en) | 1994-06-21 | 1995-02-16 | Optical receiving apparatus |
Country Status (1)
Country | Link |
---|---|
GB (3) | GB2326548B (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2245121A (en) * | 1990-06-16 | 1991-12-18 | Stc Plc | Telemetry |
-
1995
- 1995-02-16 GB GB9818894A patent/GB2326548B/en not_active Expired - Fee Related
- 1995-02-16 GB GB9819054A patent/GB2326041B/en not_active Expired - Fee Related
- 1995-02-16 GB GB9819053A patent/GB2326040B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2245121A (en) * | 1990-06-16 | 1991-12-18 | Stc Plc | Telemetry |
Also Published As
Publication number | Publication date |
---|---|
GB2326040B (en) | 1999-01-20 |
GB2326548A (en) | 1998-12-23 |
GB2326041A (en) | 1998-12-09 |
GB2326040A (en) | 1998-12-09 |
GB9819054D0 (en) | 1998-10-28 |
GB9818894D0 (en) | 1998-10-21 |
GB2326548B (en) | 1999-03-10 |
GB9819053D0 (en) | 1998-10-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010216 |