JPS5715544A - Automatic threshold value control system for optical communication receiving system - Google Patents
Automatic threshold value control system for optical communication receiving systemInfo
- Publication number
- JPS5715544A JPS5715544A JP9088280A JP9088280A JPS5715544A JP S5715544 A JPS5715544 A JP S5715544A JP 9088280 A JP9088280 A JP 9088280A JP 9088280 A JP9088280 A JP 9088280A JP S5715544 A JPS5715544 A JP S5715544A
- Authority
- JP
- Japan
- Prior art keywords
- wave length
- light
- threshold value
- level
- signal 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.)
- Granted
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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
- H04B10/6911—Photodiode bias control, e.g. for compensating temperature variations
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Light Receiving Elements (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To achieve a wide dynamic range without being affected by a noise background light other than a signal light, by comparing an external noise light level and a signal light level and controlling the threshold value of an identifying reproducing device. CONSTITUTION:A light passing through an optical filter 11 in a short wave length cut interrupting a signal light wave length is made photoelectric conversion and amplified, and an external light level is measured with a peak detector 18 consisting of a low pass filter. On the other hand, a light passing through an optical filter 21 in a short wave length cut interrupting shorter wave length than the signal light wave length is also made photo electric conversion and amplified with an APD22 as photo detecting element, and after amplification at a preamplifier 23 and a main amplifier 24, it is applied to a peak detector consisting of a low pass filter through an equalizer 25 to obtain an output level. Said output level is compared with the external light level at a comparator 29 to exercise control for optimum threshold value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55090882A JPS6040223B2 (en) | 1980-07-02 | 1980-07-02 | Automatic threshold control method for optical communication receiving system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55090882A JPS6040223B2 (en) | 1980-07-02 | 1980-07-02 | Automatic threshold control method for optical communication receiving system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5715544A true JPS5715544A (en) | 1982-01-26 |
JPS6040223B2 JPS6040223B2 (en) | 1985-09-10 |
Family
ID=14010807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55090882A Expired JPS6040223B2 (en) | 1980-07-02 | 1980-07-02 | Automatic threshold control method for optical communication receiving system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6040223B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07193546A (en) * | 1993-12-27 | 1995-07-28 | Nec Corp | Light-receiving circuit |
JP2009027480A (en) * | 2007-07-19 | 2009-02-05 | Toyota Central R&D Labs Inc | Optical communication device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0532017Y2 (en) * | 1987-07-31 | 1993-08-17 |
-
1980
- 1980-07-02 JP JP55090882A patent/JPS6040223B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07193546A (en) * | 1993-12-27 | 1995-07-28 | Nec Corp | Light-receiving circuit |
JP2009027480A (en) * | 2007-07-19 | 2009-02-05 | Toyota Central R&D Labs Inc | Optical communication device |
Also Published As
Publication number | Publication date |
---|---|
JPS6040223B2 (en) | 1985-09-10 |
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