JPS5685945A - Automatic gain control system for photoreceiver - Google Patents
Automatic gain control system for photoreceiverInfo
- Publication number
- JPS5685945A JPS5685945A JP16329079A JP16329079A JPS5685945A JP S5685945 A JPS5685945 A JP S5685945A JP 16329079 A JP16329079 A JP 16329079A JP 16329079 A JP16329079 A JP 16329079A JP S5685945 A JPS5685945 A JP S5685945A
- Authority
- JP
- Japan
- Prior art keywords
- output
- apd1
- photodetection
- avalanche photodiode
- current
- 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
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
- H04B10/691—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)
- Optical Communication System (AREA)
Abstract
PURPOSE:To elevate the reliability of an avalanche photodiode, by detecting whether the avalanche photodiode has detected light or not, and controlling the bias voltage of the avalanche photodiode so that it becomes a constant value, when the photodetection has been cut off. CONSTITUTION:When a light signal has been input to the avalanche photodiode (APD)1, a signal current is output from the APD1, the current-voltage conversion is executed by the amplifier 2, and it is output to the terminal 7. At the time of photodetection, whether light has been detected or not is detected by the carrier detector 8, the relay 10 is controlled by its output, the output of the AGC comparator 4 is connected to the DC amplifier 6, and the bias voltage of the APD1 is controlled so that the output current of the APD1 becomes constant. When the photodetection has been cut off, the detector 8 detects it, and controls the relay 10 so that the reference voltage 9 and the amplifier 6 are connected. In this way, the bias voltage of the APD1 drops, and when it has become a photodetecting state again, an excess current does not flow into the APD at the time of starting the photodetection, by detecting said state and closing the AGC loop, and the reliability of the APD is elevated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16329079A JPS5685945A (en) | 1979-12-14 | 1979-12-14 | Automatic gain control system for photoreceiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16329079A JPS5685945A (en) | 1979-12-14 | 1979-12-14 | Automatic gain control system for photoreceiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5685945A true JPS5685945A (en) | 1981-07-13 |
Family
ID=15771004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16329079A Pending JPS5685945A (en) | 1979-12-14 | 1979-12-14 | Automatic gain control system for photoreceiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5685945A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0633517A2 (en) * | 1993-07-09 | 1995-01-11 | Hamamatsu Photonics K.K. | Bias circuit for avalanche photodiode |
-
1979
- 1979-12-14 JP JP16329079A patent/JPS5685945A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0633517A2 (en) * | 1993-07-09 | 1995-01-11 | Hamamatsu Photonics K.K. | Bias circuit for avalanche photodiode |
EP0633517A3 (en) * | 1993-07-09 | 1996-11-27 | Hamamatsu Photonics Kk | Bias circuit for avalanche photodiode. |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3644740A (en) | Control circuit for biasing a photodetector so as to maintain a selected false alarm rate | |
JPS6157746B2 (en) | ||
JPS5685945A (en) | Automatic gain control system for photoreceiver | |
JPS5488704A (en) | Automatic gain control system | |
JPS5542304A (en) | Tracking mirror protector of optical information reader | |
JPS5583280A (en) | Output stabilizing system for semiconductor laser | |
JPS57168513A (en) | Automatic gain controlling system of optical receiver | |
SE7906152L (en) | CIRCUIT FOR AUTOMATIC AMPLIFIER CONTROL | |
JPS57180234A (en) | Malfunction preventing circuit for photodetector | |
JPS5437403A (en) | Automatic gain control method for light receiving circuit | |
JPS63151205A (en) | Optical receiving circuit | |
JPS5742218A (en) | Delay automatic gain control circuit | |
JPS56143738A (en) | Automatic gain controlling system of light receiver | |
JPS57207446A (en) | Optical reception squeltch circuit | |
JPS5564452A (en) | Photo receiver circuit | |
JPS56100539A (en) | Light agc system | |
JPS56140789A (en) | Color balance control circuit | |
JP2600462B2 (en) | Optical receiving circuit | |
JPS57111144A (en) | Optical automatic gain control system | |
JPS54120561A (en) | Automatic gain control amplifier | |
JPS5752210A (en) | Automatic switching and releasing circuit in automatic gain controlling circuit | |
JPS5757049A (en) | Light agc system | |
JPS5754444A (en) | Optical communication system | |
JPS56169443A (en) | Detecting circuit for input signal interruption | |
SU943788A1 (en) | Fire alarm device |