JPS56164642A - Optical digital transmitter - Google Patents
Optical digital transmitterInfo
- Publication number
- JPS56164642A JPS56164642A JP6713180A JP6713180A JPS56164642A JP S56164642 A JPS56164642 A JP S56164642A JP 6713180 A JP6713180 A JP 6713180A JP 6713180 A JP6713180 A JP 6713180A JP S56164642 A JPS56164642 A JP S56164642A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- level
- comparator
- automatic
- chopping
- 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
- H04B10/50—Transmitters
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Semiconductor Lasers (AREA)
- Optical Communication System (AREA)
Abstract
PURPOSE:To operate an automatic chopping circuit correctly, by giving a hysteresis characteristic to a circuit where the comparison with the reference value of an automatic chopping circuit is made, and keeping the light source in a chopped state even if the input level of the comparison circuit is changed after being chopped once. CONSTITUTION:An LD(semiconductor laser)2 is driven with a driving circuit 1 according to an input signal. Further, it is monitored by a photodiode 3 and an LD level is detected by a peak detecting circuit 5. This level is fed to an APC (automatic output controlling circuit)6 and feedback is given to the circuit 1. On the other hand, the peak value level is inputted to a comparator 8 having hysteresis to be compared with the reference value, and if the peak level is low, the input signal is cut off with a chopping gate 9 and deteriorated LDs are chopped. After that, although the input to the comparator 8 is increased up to a pseudo output level by a protection circuit 10, since the upper-limit threshold level is set higher than the pseudo output level, the output of the comparator 8 is not changed, allowing to complete the automatic chopping of an LD2 smoothly.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6713180A JPS56164642A (en) | 1980-05-22 | 1980-05-22 | Optical digital transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6713180A JPS56164642A (en) | 1980-05-22 | 1980-05-22 | Optical digital transmitter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56164642A true JPS56164642A (en) | 1981-12-17 |
Family
ID=13336031
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6713180A Pending JPS56164642A (en) | 1980-05-22 | 1980-05-22 | Optical digital transmitter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56164642A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021585A (en) * | 1983-07-15 | 1985-02-02 | Hitachi Koki Co Ltd | Laser diode control circuit |
JPS6068683A (en) * | 1983-08-30 | 1985-04-19 | Yokogawa Hewlett Packard Ltd | Laser protecting circuit |
-
1980
- 1980-05-22 JP JP6713180A patent/JPS56164642A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021585A (en) * | 1983-07-15 | 1985-02-02 | Hitachi Koki Co Ltd | Laser diode control circuit |
JPS6068683A (en) * | 1983-08-30 | 1985-04-19 | Yokogawa Hewlett Packard Ltd | Laser protecting circuit |
JPH0348674B2 (en) * | 1983-08-30 | 1991-07-25 | Hewlett Packard Co |
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