JPS587373U - Laser diode drive current monitor circuit - Google Patents
Laser diode drive current monitor circuitInfo
- Publication number
- JPS587373U JPS587373U JP10014581U JP10014581U JPS587373U JP S587373 U JPS587373 U JP S587373U JP 10014581 U JP10014581 U JP 10014581U JP 10014581 U JP10014581 U JP 10014581U JP S587373 U JPS587373 U JP S587373U
- Authority
- JP
- Japan
- Prior art keywords
- laser diode
- coaxial cable
- diode drive
- drive current
- monitor circuit
- 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.)
- Granted
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のレーザダイオード駆動電流モニタ回路の
回路図、第２図はレーザダイオードの駆動電流−光出力
の関係を示すグラフ、第３図は本考案に係るレーザダイ
オード駆動電流モニタ回路、−の第１の実施例の回路図
、第４図は本考案に係る第１の実施例の具体例を示す回
路図、第５図は本考案に係る第４図の回路により測定し
たレーザダイオード駆動電流のオシロスコープ上の波形
写真、第６図は本考案の他の実施例である。
ＬＤ−Ｌ／−ザダイオード、Ｒｃ、 Ｒｍ、 Ｒｔ、
ＤＰ−抵抗、ＳＰ・・・サージプロテクタ、ＭＯＮ・・
・同軸コネクタ、ＴＲ１，ＴＲ２・・・トランジスタ、
ＴＰ・・・モニタ端子、■・・・レーザダイオード電流
、Ｐ・・・光出力、Ｉ□・・・バイアス電流、１１・・
・信号電流、Ｃ，ＴＣ・・・同軸ケーブル、Ｚｏ・・・
同軸ケーブルの特性インピーダンス、Ｏ８・・・オシロ
スコープ、ＩＮ・・・オシロスコープ入力端、■□・・
・抵抗Ｒｃに発生する電圧、Ｖ２・・・同軸ケーブルの
終端抵抗に発生する電圧、Ｄｌ。
Ｄ２・・・シリコンダイオード。
第５図 、FIG. 1 is a circuit diagram of a conventional laser diode drive current monitor circuit, FIG. 2 is a graph showing the relationship between laser diode drive current and optical output, and FIG. 3 is a laser diode drive current monitor circuit according to the present invention. FIG. 4 is a circuit diagram showing a specific example of the first embodiment according to the present invention, and FIG. 5 is a laser diode drive measured by the circuit shown in FIG. 4 according to the present invention. A photograph of the current waveform on an oscilloscope, FIG. 6, is another embodiment of the present invention. LD-L/-The diode, Rc, Rm, Rt,
DP-resistance, SP... surge protector, MON...
・Coaxial connector, TR1, TR2...transistor,
TP...Monitor terminal, ■...Laser diode current, P...Optical output, I□...Bias current, 11...
・Signal current, C, TC...Coaxial cable, Zo...
Characteristic impedance of coaxial cable, O8...Oscilloscope, IN...Oscilloscope input end, ■□...
- Voltage generated at the resistor Rc, V2...Voltage generated at the terminating resistor of the coaxial cable, Dl. D2...Silicon diode. Figure 5,
Claims (1)
、レーザダイオードの接地側に同軸ケーブルの特性イン
ピーダンスに比べ十分低い抵抗Ｒｃと、同軸ケーブルの
特性インピーダンスに等しい抵抗Ｒｍを接続し、該抵抗
Ｒｍの出力側に同軸ケーブルを接続して該同軸ケーブル
の終端には外部と接続する接続手段と、同軸ケーブルの
特性インピーダンス゛に等しい終端抵抗を接続して成る
レーザダイオード駆動電流モニタ回路。In a laser diode drive circuit that performs constant current drive, a resistor Rc that is sufficiently lower than the characteristic impedance of the coaxial cable and a resistor Rm that is equal to the characteristic impedance of the coaxial cable are connected to the ground side of the laser diode, and the output side of the resistor Rm is connected to the ground side of the laser diode. A laser diode drive current monitor circuit comprising: a coaxial cable connected to the coaxial cable; a connecting means for connecting an external device to the terminal end of the coaxial cable; and a terminating resistor equal to the characteristic impedance of the coaxial cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10014581U JPS587373U (en) | 1981-07-07 | 1981-07-07 | Laser diode drive current monitor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10014581U JPS587373U (en) | 1981-07-07 | 1981-07-07 | Laser diode drive current monitor circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS587373U true JPS587373U (en) | 1983-01-18 |
| JPH0353513Y2 JPH0353513Y2 (en) | 1991-11-22 |
Family
ID=29894850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10014581U Granted JPS587373U (en) | 1981-07-07 | 1981-07-07 | Laser diode drive current monitor circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS587373U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543661U (en) * | 1977-06-10 | 1979-01-11 |
-
1981
- 1981-07-07 JP JP10014581U patent/JPS587373U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS543661U (en) * | 1977-06-10 | 1979-01-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0353513Y2 (en) | 1991-11-22 |
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