JPS6420687A - Drive circuit for semiconductor laser - Google Patents
Drive circuit for semiconductor laserInfo
- Publication number
- JPS6420687A JPS6420687A JP17684787A JP17684787A JPS6420687A JP S6420687 A JPS6420687 A JP S6420687A JP 17684787 A JP17684787 A JP 17684787A JP 17684787 A JP17684787 A JP 17684787A JP S6420687 A JPS6420687 A JP S6420687A
- Authority
- JP
- Japan
- Prior art keywords
- light output
- average light
- semiconductor laser
- signal
- duty ratio
- 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
- 239000004065 semiconductor Substances 0.000 title abstract 4
- 238000012544 monitoring process Methods 0.000 abstract 4
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/06835—Stabilising during pulse modulation or generation
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
PURPOSE:To enable a constant peak output of a semiconductor laser to be maintained without depending on the duty ratio of a modulated input signal, by changing an average light output command of the semiconductor laser according to the duty ratio of the modulated input signal. CONSTITUTION:A photoelectric current, which varies directly with the light output of a semiconductor laser 5, flows through a photodiode 6 composing a means A for detecting light output to be converted into a voltage by a resistor 7. The laser 5 is drived by pulses produced through a modulated signal to vary a monitoring signal for the light output. This monitoring signal is smoothed and is converted the level thereof to be output as an average light output monitoring value by the means A. On the other hand, the modulated signal is supplied to a means B for outputting average light output command through an inverter 15 to become an average light output command at a variable resistor 23. An amplifier 12 amplifies the difference between the average light output command and the average light output monitoring value to drive a transistor 2. Therefore, the light output of the laser 5 is so controlled as to correspond to the average light output command, and the peak output thereof is so controlled as to be constant without depending on the duty ratio of the modulated signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17684787A JPS6420687A (en) | 1987-07-15 | 1987-07-15 | Drive circuit for semiconductor laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17684787A JPS6420687A (en) | 1987-07-15 | 1987-07-15 | Drive circuit for semiconductor laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6420687A true JPS6420687A (en) | 1989-01-24 |
Family
ID=16020871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17684787A Pending JPS6420687A (en) | 1987-07-15 | 1987-07-15 | Drive circuit for semiconductor laser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6420687A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06213440A (en) * | 1993-01-14 | 1994-08-02 | Nippondenso Co Ltd | Glow plug |
-
1987
- 1987-07-15 JP JP17684787A patent/JPS6420687A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06213440A (en) * | 1993-01-14 | 1994-08-02 | Nippondenso Co Ltd | Glow plug |
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