JPS6458137A - Optical signal transmission system - Google Patents
Optical signal transmission systemInfo
- Publication number
- JPS6458137A JPS6458137A JP21621287A JP21621287A JPS6458137A JP S6458137 A JPS6458137 A JP S6458137A JP 21621287 A JP21621287 A JP 21621287A JP 21621287 A JP21621287 A JP 21621287A JP S6458137 A JPS6458137 A JP S6458137A
- Authority
- JP
- Japan
- Prior art keywords
- loopback
- signal light
- photodiode
- terminal station
- repeater
- 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.)
- Pending
Links
Landscapes
- Dc Digital Transmission (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To prevent a loop from being formed in an optical transmission line when loopback is operated by decreasing a feeding voltage level to a photoelectric conversion capability missing level or below in the 1st photodetector in response to an output signal when a loopback signal light is made incident in the 2nd photodetector. CONSTITUTION:In applying optical loopback from a terminal station A to an incoming side of a repeater Rep 2 to apply fault monitor as to the optical line between the terminal stations A, B, the loopback signal light is made incident in a photodiode 1222 of the repeater Rep2. The output signal from a photodiode 1222 is inputted to an equalizer 1622 together with an output signal of a photodiode 1022 receiving a main signal light from the terminal station B. A DC-DC converter 1422 reduces the DC voltage levelfed to the photodiode 1022. Thus, only the loopback signal light from the terminal station A is returned to the repeater Rep1 and the terminal station A. Thus, the loop for the loopback signal light is not formed in the optical line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21621287A JPS6458137A (en) | 1987-08-28 | 1987-08-28 | Optical signal transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21621287A JPS6458137A (en) | 1987-08-28 | 1987-08-28 | Optical signal transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6458137A true JPS6458137A (en) | 1989-03-06 |
Family
ID=16685033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21621287A Pending JPS6458137A (en) | 1987-08-28 | 1987-08-28 | Optical signal transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6458137A (en) |
-
1987
- 1987-08-28 JP JP21621287A patent/JPS6458137A/en active Pending
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