JPH03120115U - - Google Patents
Info
- Publication number
- JPH03120115U JPH03120115U JP2946290U JP2946290U JPH03120115U JP H03120115 U JPH03120115 U JP H03120115U JP 2946290 U JP2946290 U JP 2946290U JP 2946290 U JP2946290 U JP 2946290U JP H03120115 U JPH03120115 U JP H03120115U
- Authority
- JP
- Japan
- Prior art keywords
- avalanche photodiode
- voltage
- amplifier
- avalanche
- photodiode
- 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 4
- 230000015556 catabolic process Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Optical Radar Systems And Details Thereof (AREA)
- Amplifiers (AREA)
Description
第１図はこの考案による光受信回路の一実施例
の構成を示す図、第２図は従来の光受信回路の構
成を示す図、第３図は、ＡＰＤの増倍率とバイア
ス電圧の関係を示す図である。
図において、１……直流電源、２……アバラン
シエ・フオトダイオード、３……受信光、４……
増幅器、５……基準電源、６……比較器、７……
抵抗。なお、図中、同一符号は同一、又は相当部
分を示す。
FIG. 1 is a diagram showing the configuration of an embodiment of the optical receiver circuit according to this invention, FIG. 2 is a diagram showing the configuration of a conventional optical receiver circuit, and FIG. 3 is a diagram showing the relationship between the multiplication factor and bias voltage of the APD. FIG. In the figure, 1...DC power supply, 2...Avalanche photodiode, 3...Receiving light, 4...
Amplifier, 5... Reference power supply, 6... Comparator, 7...
resistance. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
トダイオードと、このアバランシエ・フオトダイ
オードに直列に接続され前記アバランシエ・フオ
トダイオードに入射した背景光による出力電流に
よつて生じる電圧降下により受信信号の信号対雑
音比が実質的に最適値となる前記アバランシエ・
フオトダイオードの増倍率が得られる前記アバラ
ンシエ・フオトダイオードのバイアス電圧が発生
するよう設定された抵抗値を有する抵抗と、前記
アバランシエ・フオトダイオードと前記抵抗の直
列回路に前記アバランシエ・フオトダイオードの
ブレークダウン電圧の近傍の値でありかつ前記ブ
レークダウン電圧よりも低い値の電圧を印加する
直流電源と、前記アバランシエ・フオトダイオー
ドからの出力電流を電圧信号に変換して増幅する
増幅器とを備えた光受信回路。 (2) 前記抵抗は、実質的に次式により求められ
る抵抗値としたことを特徴とする実用新案登録請
求の範囲第(1)項記載の光受信回路。 Ｒ＝ｅｘＶｃｍ〔４ＫＴＦＲＬ〕 ここでＲは前記抵抗値、ｅは電荷、ｘは前記ア
バランシエ・フオトダイオードの過剰雑音指数、
Ｖｃは前記直列回路への印加電圧、ｍは前記アバ
ランシエ・フオトダイオードの増倍率とバイアス
電圧の関係から決定される定数、ｋはボルツマン
定数、Ｔは絶対温度、Ｆは増幅器の雑音指数、Ｒ
Ｌは増幅器の入力抵抗である。[Claims for Utility Model Registration] (1) An avalanche photodiode that photoelectrically converts received light, and an output current generated by background light that is connected in series with the avalanche photodiode and that is incident on the avalanche photodiode. The avalanche filter in which the signal-to-noise ratio of the received signal becomes substantially the optimum value due to the voltage drop.
A resistor having a resistance value set to generate a bias voltage for the avalanche photodiode to obtain a multiplication factor of the photodiode, and a series circuit of the avalanche photodiode and the resistor include a breakdown of the avalanche photodiode. an optical receiver comprising: a DC power source that applies a voltage close to the breakdown voltage and lower than the breakdown voltage; and an amplifier that converts the output current from the avalanche photodiode into a voltage signal and amplifies it. circuit. (2) The optical receiver circuit according to claim 1, wherein the resistor has a resistance value substantially determined by the following equation. R=exV cm [ 4 KTFRL] where R is the resistance value, e is the charge, x is the excess noise figure of the avalanche photodiode,
V c is the voltage applied to the series circuit, m is a constant determined from the relationship between the multiplication factor of the avalanche photodiode and the bias voltage, k is Boltzmann's constant, T is the absolute temperature, F is the noise figure of the amplifier, R
L is the input resistance of the amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2946290U JPH03120115U (en) | 1990-03-22 | 1990-03-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2946290U JPH03120115U (en) | 1990-03-22 | 1990-03-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03120115U true JPH03120115U (en) | 1991-12-10 |
Family
ID=31532217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2946290U Pending JPH03120115U (en) | 1990-03-22 | 1990-03-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03120115U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286669A (en) * | 2007-05-18 | 2008-11-27 | Sokkia Topcon Co Ltd | Light wave range finder |
| JP2014192895A (en) * | 2013-03-26 | 2014-10-06 | Excelitas Canada Inc | DIFFERENTIAL OPTICAL RECEIVER FOR AVALANCHE PHOTODIODE AND SiPM |
-
1990
- 1990-03-22 JP JP2946290U patent/JPH03120115U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008286669A (en) * | 2007-05-18 | 2008-11-27 | Sokkia Topcon Co Ltd | Light wave range finder |
| JP2014192895A (en) * | 2013-03-26 | 2014-10-06 | Excelitas Canada Inc | DIFFERENTIAL OPTICAL RECEIVER FOR AVALANCHE PHOTODIODE AND SiPM |
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