JPH0428463U - - Google Patents
Info
- Publication number
- JPH0428463U JPH0428463U JP6961190U JP6961190U JPH0428463U JP H0428463 U JPH0428463 U JP H0428463U JP 6961190 U JP6961190 U JP 6961190U JP 6961190 U JP6961190 U JP 6961190U JP H0428463 U JPH0428463 U JP H0428463U
- Authority
- JP
- Japan
- Prior art keywords
- bias current
- laser diode
- circuit
- flop
- flip
- 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
- 230000005856 abnormality Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Communication System (AREA)
Description
第１図は本考案によるレーザダイオードバイア
ス電流制御回路の一実施例を示すブロツク図、第
２図は従来のレーザダイオードバイアス電流制御
回路の一例を示すブロツク図である。
３……レーザダイオード、４……フオトダイオ
ード、６……バイアス電流制御回路、７……バイ
アス電流モニタ回路、８……バイアス電流異常検
出回路、１０……Ｒ−Ｓフリツプフロツプ（フリ
ツプフロツプ）、１１……バイアス電流遮断回路
、１２……パワーオンクリア回路。
FIG. 1 is a block diagram showing an embodiment of a laser diode bias current control circuit according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional laser diode bias current control circuit. 3... Laser diode, 4... Photo diode, 6... Bias current control circuit, 7... Bias current monitor circuit, 8... Bias current abnormality detection circuit, 10... R-S flip-flop (flip-flop), 11... ...Bias current cutoff circuit, 12...Power-on clear circuit.
Claims (1)
オードでモニタし、得られた光電流が一定となる
よう前記レーザダイオードのバイアス電流を制御
するレーザダイオードバイアス電流制御回路にお
いて、前記レーザダイオードのバイアス電流をモ
ニタするバイアス電流モニタ回路と、このバイア
ス電流モニタ回路の出力を入力とし前記レーザダ
イオードのバイアス電流異常を検出するバイアス
電流異常検出回路と、このバイアス電流異常検出
回路の出力をラツチするフリツプフロツプと、こ
のフリツプフロツプの出力でバイアス電流を遮断
する回路と、前記フリツプフロツプを電源投入時
リセツトするパワーオンクリア回路を備えてなる
ことを特徴とするレーザダイオードバイアス電流
制御回路。 A bias for monitoring the bias current of the laser diode in a laser diode bias current control circuit that monitors the optical output level of the laser diode with a photodiode and controls the bias current of the laser diode so that the obtained photocurrent is constant. a current monitor circuit, a bias current abnormality detection circuit that receives the output of the bias current monitor circuit as an input and detects a bias current abnormality of the laser diode, a flip-flop that latches the output of the bias current abnormality detection circuit, and an output of this flip-flop. 1. A laser diode bias current control circuit comprising: a circuit for cutting off a bias current when the flip-flop is turned on; and a power-on clear circuit for resetting the flip-flop when the power is turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6961190U JPH0428463U (en) | 1990-07-02 | 1990-07-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6961190U JPH0428463U (en) | 1990-07-02 | 1990-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0428463U true JPH0428463U (en) | 1992-03-06 |
Family
ID=31605070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6961190U Pending JPH0428463U (en) | 1990-07-02 | 1990-07-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428463U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06338646A (en) * | 1993-05-28 | 1994-12-06 | Nec Corp | Laser diode drive circuit |
| JP2006032903A (en) * | 2004-06-15 | 2006-02-02 | Hitachi Cable Ltd | Laser driver ic and optical transceiver using same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61174692A (en) * | 1985-01-29 | 1986-08-06 | Sharp Corp | Evaluation circuit for semiconductor laser |
| JPS6455882A (en) * | 1987-08-27 | 1989-03-02 | Matsushita Electric Ind Co Ltd | Stabilizing circuit for output of semiconductor laser light |
| JPS6459879A (en) * | 1987-08-31 | 1989-03-07 | Matsushita Electric Ind Co Ltd | Semiconductor laser protective circuit |
-
1990
- 1990-07-02 JP JP6961190U patent/JPH0428463U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61174692A (en) * | 1985-01-29 | 1986-08-06 | Sharp Corp | Evaluation circuit for semiconductor laser |
| JPS6455882A (en) * | 1987-08-27 | 1989-03-02 | Matsushita Electric Ind Co Ltd | Stabilizing circuit for output of semiconductor laser light |
| JPS6459879A (en) * | 1987-08-31 | 1989-03-07 | Matsushita Electric Ind Co Ltd | Semiconductor laser protective circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06338646A (en) * | 1993-05-28 | 1994-12-06 | Nec Corp | Laser diode drive circuit |
| JP2006032903A (en) * | 2004-06-15 | 2006-02-02 | Hitachi Cable Ltd | Laser driver ic and optical transceiver using same |