JPS6416036A - Automatic reception level control system for coherent light communication - Google Patents
Automatic reception level control system for coherent light communicationInfo
- Publication number
- JPS6416036A JPS6416036A JP62171570A JP17157087A JPS6416036A JP S6416036 A JPS6416036 A JP S6416036A JP 62171570 A JP62171570 A JP 62171570A JP 17157087 A JP17157087 A JP 17157087A JP S6416036 A JPS6416036 A JP S6416036A
- Authority
- JP
- Japan
- Prior art keywords
- level
- local oscillation
- detection
- light
- oscillation light
- 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
- Optical Communication System (AREA)
Abstract
PURPOSE:To keep the detection output automatically to a constant level independently of the fluctuation of a receiving light level by controlling the intensity of the local oscillation light in response to the detection level of a detection signal. CONSTITUTION:The level of the detection signal 4 is detected in the coherent optical communication system where the received light 1 and the local oscillation light 2 are mixed and the result is made incident on the photodetector 3 to obtain a detection signal 4, to control the intensity of the local oscillation light 2 in response to the detected level. That is, in the heterodyne detection, since an intermediate frequency signal proportional to the product of the strength between the received light and the local oscillation light is obtained, the intensity of the local oscillation light is controlled so as to make the product constant, that is, the level of the detection signal is made constant. Thus, the detection output of a prescribed level is obtained without using the electric AGC (automatic gain control) circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62171570A JPS6416036A (en) | 1987-07-09 | 1987-07-09 | Automatic reception level control system for coherent light communication |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62171570A JPS6416036A (en) | 1987-07-09 | 1987-07-09 | Automatic reception level control system for coherent light communication |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6416036A true JPS6416036A (en) | 1989-01-19 |
Family
ID=15925595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62171570A Pending JPS6416036A (en) | 1987-07-09 | 1987-07-09 | Automatic reception level control system for coherent light communication |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416036A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013145942A (en) * | 2012-01-13 | 2013-07-25 | Mitsubishi Electric Corp | Optical transmitting/receiving apparatus |
JP2014168176A (en) * | 2013-02-28 | 2014-09-11 | Nippon Telegr & Teleph Corp <Ntt> | Photoreceiver |
JP2014230162A (en) * | 2013-05-23 | 2014-12-08 | 日本電信電話株式会社 | Optical reception device and optical reception method |
JP2015084594A (en) * | 2011-01-20 | 2015-04-30 | 日本電気株式会社 | Coherent light receiver and coherent light receiving method |
JP2019146235A (en) * | 2013-03-15 | 2019-08-29 | 日本電気株式会社 | Optical transmitter-receiver and optical transmission-reception method |
-
1987
- 1987-07-09 JP JP62171570A patent/JPS6416036A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015084594A (en) * | 2011-01-20 | 2015-04-30 | 日本電気株式会社 | Coherent light receiver and coherent light receiving method |
JP2013145942A (en) * | 2012-01-13 | 2013-07-25 | Mitsubishi Electric Corp | Optical transmitting/receiving apparatus |
JP2014168176A (en) * | 2013-02-28 | 2014-09-11 | Nippon Telegr & Teleph Corp <Ntt> | Photoreceiver |
JP2019146235A (en) * | 2013-03-15 | 2019-08-29 | 日本電気株式会社 | Optical transmitter-receiver and optical transmission-reception method |
JP2020115676A (en) * | 2013-03-15 | 2020-07-30 | 日本電気株式会社 | Optical transmitter-receiver and optical transmission-reception method |
US10880003B2 (en) | 2013-03-15 | 2020-12-29 | Nec Corporation | Optical transmission/ reception device, optical communication system and optical transmission/ reception method |
US11277202B2 (en) | 2013-03-15 | 2022-03-15 | Nec Corporation | Optical transmission/reception device, optical communications system and optical transmission/reception method |
JP2014230162A (en) * | 2013-05-23 | 2014-12-08 | 日本電信電話株式会社 | Optical reception device and optical reception method |
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