JPS6379578U - - Google Patents
Info
- Publication number
- JPS6379578U JPS6379578U JP17336786U JP17336786U JPS6379578U JP S6379578 U JPS6379578 U JP S6379578U JP 17336786 U JP17336786 U JP 17336786U JP 17336786 U JP17336786 U JP 17336786U JP S6379578 U JPS6379578 U JP S6379578U
- Authority
- JP
- Japan
- Prior art keywords
- laser diode
- section
- bias
- photoelectric conversion
- reference voltage
- 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
- 238000001514 detection method Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000006866 deterioration Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
Landscapes
- Testing Of Individual Semiconductor Devices (AREA)
Description
第１図は本考案の一実施例の構成図、第２図、
第３図はレーザダイオードの劣化を説明するため
の特性曲線を示す図、第４図は従来のレーザダイ
オード劣化検出装置を説明するための特性曲線を
示す図である。
１……レーザダイオード、２……フオトダイオ
ード、３……抵抗、４……コンデンサ、５……ク
ランプ回路、６，８……平滑回路、７……ひき算
器、９……比較器、１０……基準電圧発生部、２
０……光電変換部、３０……バイアス検出部。
Figure 1 is a configuration diagram of an embodiment of the present invention; Figure 2;
FIG. 3 is a diagram showing a characteristic curve for explaining the deterioration of a laser diode, and FIG. 4 is a diagram showing a characteristic curve for explaining a conventional laser diode deterioration detection device. 1... Laser diode, 2... Photo diode, 3... Resistor, 4... Capacitor, 5... Clamp circuit, 6, 8... Smoothing circuit, 7... Subtractor, 9... Comparator, 10 ...Reference voltage generation section, 2
0...Photoelectric conversion unit, 30...Bias detection unit.
Claims (1)
値を所定値に制御する駆動回路により駆動される
レーザダイオードの劣化検出装置において、前記
レーザダイオードの光を電気信号に変換する光電
変換部と、この光電変換部の出力に基づいて前記
レーザダイオードのバイアス成分を検出するバイ
アス検出部と、基準電圧を発生する基準電圧発生
部と、この基準電圧発生部により発生される基準
電圧と前記バイアス検出部により検出されたバイ
アス成分とを比較する比較部とを具備することを
特徴とするレーザダイオード劣化検出装置。 (2) 基準電圧発生部は、光電変換部に流れる暗
電流に相当する電圧とレーザダイオードが正常時
のバイアス電流に相当する電圧とを加えた電圧値
に基づく、閾値電圧を発生することを特徴とする
実用新案登録請求の範囲第(1)項記載のレーザダ
イオード劣化検出装置。[Claims for Utility Model Registration] (1) In a deterioration detection device for a laser diode driven by a drive circuit that controls the average value of light emission output to a predetermined value by changing a bias current, the light from the laser diode is converted into an electrical signal. a photoelectric conversion section that converts the output of the photoelectric conversion section into a bias component of the laser diode based on the output of the photoelectric conversion section; a reference voltage generation section that generates a reference voltage; A laser diode deterioration detection device, comprising: a comparison section that compares a reference voltage detected by the bias detection section with a bias component detected by the bias detection section. (2) The reference voltage generation section is characterized in that it generates a threshold voltage based on a voltage value that is the sum of a voltage corresponding to the dark current flowing in the photoelectric conversion section and a voltage corresponding to the bias current when the laser diode is normal. A laser diode deterioration detection device according to claim (1) of the utility model registration claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17336786U JPS6379578U (en) | 1986-11-13 | 1986-11-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17336786U JPS6379578U (en) | 1986-11-13 | 1986-11-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6379578U true JPS6379578U (en) | 1988-05-26 |
Family
ID=31110762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17336786U Pending JPS6379578U (en) | 1986-11-13 | 1986-11-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6379578U (en) |
-
1986
- 1986-11-13 JP JP17336786U patent/JPS6379578U/ja active Pending
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