JPH0390143U - - Google Patents
Info
- Publication number
- JPH0390143U JPH0390143U JP14974589U JP14974589U JPH0390143U JP H0390143 U JPH0390143 U JP H0390143U JP 14974589 U JP14974589 U JP 14974589U JP 14974589 U JP14974589 U JP 14974589U JP H0390143 U JPH0390143 U JP H0390143U
- Authority
- JP
- Japan
- Prior art keywords
- output level
- resistor
- photodiode
- laser diode
- optical output
- 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
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Communication System (AREA)
Description
第１図は本考案の一実施例による光出力レベル
切替回路を含む光送信回路のブロツク図、第２図
は従来の光出力レベル切替回路を含む光送信回路
のブロツク図である。
１１……レーザダイオード駆動回路、１２……
レーザダイオード、１３……フオトダイオード、
１４……光出力レベル切替回路、１５……制御回
路、１６……電源、１７……基準電圧源、Ｒ……
直列固定抵抗、Ｒ１，Ｒ２……固定抵抗、ＲＶ…
…可変抵抗。
FIG. 1 is a block diagram of an optical transmission circuit including an optical output level switching circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional optical transmission circuit including an optical output level switching circuit. 11... Laser diode drive circuit, 12...
Laser diode, 13... photo diode,
14... Optical output level switching circuit, 15... Control circuit, 16... Power supply, 17... Reference voltage source, R...
Series fixed resistance, R 1 , R 2 ...Fixed resistance, RV...
...variable resistance.
Claims (1)
ザダイオードを駆動するレーザダイオード駆動回
路と、前記レーザダイオードの背光を受けて光出
力レベルに比例した電流を取り出すフオトダイオ
ードと、前記光出力レベルに比例した電流を電圧
に変換する負荷抵抗と、該負荷抵抗より変換され
た電圧と基準電圧を比較して、前記レーザダイオ
ードの光出力が常に一定になるように制御する制
御回路を含む光送信回路において、前記負荷抵抗
は、複数の固定抵抗を直列接続した直列固定抵抗
と可変抵抗を並列接続した抵抗ネツトワークから
構成し、前記制御回路の入力を、前記フオトダイ
オードと前記可変抵抗の接続点と前記直列固定抵
抗の任意の接続点に切替え可能としたことを特徴
とする光出力レベル切替回路。 A laser diode drive circuit that drives a laser diode using a pulse modulation signal and a DC bias current, a photodiode that receives the backlight of the laser diode and extracts a current proportional to the optical output level, and a photodiode that outputs a current proportional to the optical output level using a voltage. In the optical transmission circuit, the optical transmission circuit includes a load resistor that converts the voltage into is composed of a resistor network in which a plurality of fixed resistors are connected in series and a variable resistor is connected in parallel, and the input of the control circuit is connected between the connection point of the photodiode and the variable resistor and the series fixed resistor. An optical output level switching circuit characterized by being able to switch to any connection point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14974589U JPH0390143U (en) | 1989-12-26 | 1989-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14974589U JPH0390143U (en) | 1989-12-26 | 1989-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0390143U true JPH0390143U (en) | 1991-09-13 |
Family
ID=31696122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14974589U Pending JPH0390143U (en) | 1989-12-26 | 1989-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0390143U (en) |
-
1989
- 1989-12-26 JP JP14974589U patent/JPH0390143U/ja active Pending