JPH0246421U - - Google Patents
Info
- Publication number
- JPH0246421U JPH0246421U JP12474288U JP12474288U JPH0246421U JP H0246421 U JPH0246421 U JP H0246421U JP 12474288 U JP12474288 U JP 12474288U JP 12474288 U JP12474288 U JP 12474288U JP H0246421 U JPH0246421 U JP H0246421U
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- light receiving
- variable gain
- receiving circuit
- bias resistor
- 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 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Optical Communication System (AREA)
Description
第１図は、本考案の一実施例に係る光受信器の
要部構成を示す回路図、第２図は従来のＡＧＣ方
式の光受信器の要部構成を示す回路図、第３図は
、本実施例における受信光電力と利得制御電圧の
関係を示す線図である。
１…受光素子、２…プリアンプ、３…可変利得
アンプ、４…メインアンプ、５…ピーク検出回路
、６…ＡＧＣ電圧用アンプ、７…バツフアアンプ
、８，９…バイアス用抵抗。
FIG. 1 is a circuit diagram showing the main structure of an optical receiver according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the main structure of a conventional AGC type optical receiver, and FIG. 3 is a circuit diagram showing the main structure of a conventional AGC type optical receiver. , is a diagram showing the relationship between received optical power and gain control voltage in this example. 1... Light receiving element, 2... Preamplifier, 3... Variable gain amplifier, 4... Main amplifier, 5... Peak detection circuit, 6... AGC voltage amplifier, 7... Buffer amplifier, 8, 9... Bias resistor.
Claims (1)
上記電流信号を増幅する可変利得機能をもつたア
ンプを含むアンプ回路と、受光素子に直列に接続
されるバイアス用抵抗からなる光受信回路におい
て、バイアス抵抗に生じる直流電圧を、バツフア
アンプを介して該可変利得増幅器の利得制御端子
に入力することにより、可変利得増幅器の利得を
下げて、大入力の光レベルに対し受光回路出力の
飽和を防ぎ、信号の波形歪を防止することを特徴
とした光受信回路。 a light receiving element that converts the received optical signal into a current signal;
In an optical receiving circuit consisting of an amplifier circuit including an amplifier with a variable gain function for amplifying the above-mentioned current signal, and a bias resistor connected in series with the light receiving element, the DC voltage generated in the bias resistor is transferred to the amplifier circuit via the buffer amplifier. An optical system that lowers the gain of the variable gain amplifier by inputting it to the gain control terminal of the variable gain amplifier, thereby preventing saturation of the light receiving circuit output in response to large input light levels and preventing signal waveform distortion. receiving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12474288U JPH0246421U (en) | 1988-09-26 | 1988-09-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12474288U JPH0246421U (en) | 1988-09-26 | 1988-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0246421U true JPH0246421U (en) | 1990-03-29 |
Family
ID=31374740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12474288U Pending JPH0246421U (en) | 1988-09-26 | 1988-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246421U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0438194U (en) * | 1990-07-27 | 1992-03-31 |
-
1988
- 1988-09-26 JP JP12474288U patent/JPH0246421U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0438194U (en) * | 1990-07-27 | 1992-03-31 |