JPH02280516A - optical receiver - Google Patents
optical receiverInfo
- Publication number
- JPH02280516A JPH02280516A JP1102601A JP10260189A JPH02280516A JP H02280516 A JPH02280516 A JP H02280516A JP 1102601 A JP1102601 A JP 1102601A JP 10260189 A JP10260189 A JP 10260189A JP H02280516 A JPH02280516 A JP H02280516A
- Authority
- JP
- Japan
- Prior art keywords
- preamplifier
- optical receiver
- apd
- voltage
- comparator
- 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
Landscapes
- Amplifiers (AREA)
- Optical Communication System (AREA)
- Control Of Amplification And Gain Control (AREA)
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
【発明の詳細な説明】
産業上の利用分野
本発明は、光通信分野における五ＰＤ（アバランシェホ
トダイオード）受光素子を用いた光受信器に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical receiver using five PD (avalanche photodiode) light receiving elements in the field of optical communications.
従来の技術
従来のＡＰＤを用いた光受信器は、第２図に示すような
構成であった。光入力信号は、ＡＰＤ１により電流信号
に変換されるとともに充電流増倍作用によって増幅され
る。ムＰＩ）１の出力電流信号線、ＡＰＤ１とアース間
に接続された２個の抵抗Ｒ１，１２と、前置増幅器２０
入カインピーダンスによ）電圧信号に変換され、前置増
幅器２によシ増幅され、等酒器３によシ波形整形して出
力される。また、等酒器３の出力信号をｎｃ−ｎｃコン
バータ４に入力し、ム−ＰＤ１の印加電圧を変化させる
ことにより、ＡＰＤ１の電流増倍率を変化させ、等酒器
３の出力電圧を一定にする１８０回路を構成している。2. Description of the Related Art A conventional optical receiver using an APD has a configuration as shown in FIG. The optical input signal is converted into a current signal by the APD 1 and amplified by the charging current multiplication effect. The output current signal line of the main PI) 1, two resistors R1 and 12 connected between APD 1 and ground, and the preamplifier 20
The signal is converted into a voltage signal (depending on the input impedance), amplified by the preamplifier 2, shaped into a waveform by the alcohol dispenser 3, and output. In addition, by inputting the output signal of the alcohol dispenser 3 to the NC-NC converter 4 and changing the voltage applied to the Mu-PD 1, the current multiplication factor of the APD 1 is changed, and the output voltage of the liquor dispenser 3 is kept constant. It consists of 180 circuits.
さらに、ＡＰＤ１とアースの間に接続した２個の抵抗Ｒ
１，Ｒ２のアース側の抵抗Ｒ２０両端の電圧を差動増幅
器６を介して前置増幅器２に入力して、前置増幅器２の
利得を制御することによシ、等酒器３の出力電圧を一定
にするための制御を容易にしている。（例えば、特開昭
６２−２０８７２４号公報）
発明が解決しようとする課題
このような従来の構成では、前置増幅器の利得が受光レ
ベルに対して逐次変化するため、前置増幅器を安定に動
作させることが困難になるという課題があった。Furthermore, two resistors R connected between APD1 and ground
By inputting the voltage across the resistor R20 on the ground side of R2 to the preamplifier 2 via the differential amplifier 6 and controlling the gain of the preamplifier 2, the output voltage of the liquor dispenser 3 can be adjusted. This makes it easy to control to keep it constant. (For example, Japanese Unexamined Patent Publication No. 62-208724) Problems to be Solved by the Invention In such a conventional configuration, the gain of the preamplifier changes sequentially with respect to the received light level, so it is difficult to operate the preamplifier stably. The problem was that it was difficult to do so.
本発明は、このような課題を解決するもので、簡易な構
成で前置増幅器の利得を変化させることによシ、出力信
号を一定に制御することを容易にする光受信器を提供す
ることを目的とするものである。The present invention solves these problems and provides an optical receiver that makes it easy to control the output signal to a constant level by changing the gain of the preamplifier with a simple configuration. The purpose is to
課題を解決するための手段
本発明社、上記課題を解決するために、受光素子とアー
スの間に直列に２個の抵抗を接続し、アース側に接続し
た抵抗の両端の電圧を入力する比較器と、上記比較器の
出力信号を入力することにより利得を制御する前置増幅
器から光受信器を構成する。Means for Solving the Problems In order to solve the above problems, the present invention company has developed a comparison method in which two resistors are connected in series between the light receiving element and the ground, and the voltage across the resistors connected to the ground side is input. and a preamplifier whose gain is controlled by inputting the output signal of the comparator.
作用
このような構成によシ、前置増幅器の利得を制御し、出
力電圧を一定にするための制御を容易にする光受信器を
得ることができる。Operation: With such a configuration, it is possible to obtain an optical receiver that can easily control the gain of the preamplifier and keep the output voltage constant.
実施例
第１図は本発明の一実施例を示す光受信部のブロック図
である。１はＡＰＤ、２は前置増幅器、３は等酒器、４
は比較器、６はＤＣ−ＤＣコンバータである。Embodiment FIG. 1 is a block diagram of an optical receiver showing an embodiment of the present invention. 1 is the APD, 2 is the preamplifier, 3 is the drinker, 4
is a comparator, and 6 is a DC-DC converter.
ＡＰＤ受光素子１とアースの間に２個の抵抗Ｒ１，Ｒ２
を接続している。前置増幅器２０入力インピーダンスに
対してＲ１は十分大きく、さら４Ｃ，Ｒ１に対してＲ２
は十分大きい。Two resistors R1 and R2 between APD light receiving element 1 and ground
are connected. R1 is sufficiently large with respect to the input impedance of the preamplifier 20, and R2 with respect to 4C and R1.
is large enough.
光信号は、ＡＰＤ１によ）電流信号に変換されるととも
に、直流高電圧によシ光電流増倍作用によって電流増幅
され、前置増幅器２の入力インピーダンスによルミ圧信
号に変換し、前置増幅器２によシ増幅され、等酒器３に
よシ波形整形して出力される。等酒器３の出力はＤＣ−
Ｉｎコンバータ４に入力され、ＡＰＤＩＫ印加する直流
高電圧を制御することによシＡＰＤ１の充電流増倍率を
変化させ、等酒器３の出力電圧を一定に制御している。The optical signal is converted into a current signal (by the APD 1), amplified by the photocurrent multiplication effect using a DC high voltage, converted into a Luminescence pressure signal by the input impedance of the preamplifier 2, and then The signal is amplified by an amplifier 2, shaped into a waveform by a sake brewer 3, and output. The output of sake cup 3 is DC-
By controlling the DC high voltage input to the In converter 4 and applied to the APDIK, the charging current multiplication factor of the APD 1 is changed, and the output voltage of the alcohol dispenser 3 is controlled to be constant.
さらに、ＡＰＤ１とアースの間に直列に接続した２個の
抵抗Ｒ１，Ｒ２のアース側に接続した抵抗Ｒ２の両端の
電圧を比較器６に入力し、比較器６の任意の基準電圧と
比較し、ＩｌｉｇｈまたはＬｏｗの信号を出力する。比
較１ｉｅｓの出力信号を前置増幅器２に入力することに
よシ、前置増幅器２の利得を制御することによシ装置増
幅器２の飽和動作による歪の発生を防止し、等酒器３の
出力電圧を一定にするための制御を容易にしている。Furthermore, the voltage across the resistor R2 connected to the ground side of the two resistors R1 and R2 connected in series between the APD 1 and the ground is input to the comparator 6, and compared with an arbitrary reference voltage of the comparator 6. , Illight or Low signal. By inputting the output signal of the comparator 1ies to the preamplifier 2, by controlling the gain of the preamplifier 2, generation of distortion due to saturation operation of the device amplifier 2 is prevented, and the output signal of the equalizer 3 is controlled. This facilitates control to keep the output voltage constant.
また、抵抗Ｒ２と並列にコンデンサを接続して比較器６
の入力電圧を安定化するとともに、比較器６にヒステリ
シス特性を有する比較器を使用することＫよシ、前置増
幅器２の利得制御をよシ安定化することが可能となる。In addition, a capacitor is connected in parallel with the resistor R2, and the comparator 6
In addition to stabilizing the input voltage of the preamplifier 2, by using a comparator having hysteresis characteristics as the comparator 6, it is possible to further stabilize the gain control of the preamplifier 2.
発明の効果
以上述べてきたように１本発明によれば、きわめて簡単
な構成で前置増幅器の利得を制御可能であシ、出力信号
を一定に制御することが安定に、かつ、容易になシ、動
作受光レベル範囲の広い光受信器を得ることができ、実
用的に極めて有用である。Effects of the Invention As described above, according to the present invention, the gain of the preamplifier can be controlled with an extremely simple configuration, and the output signal can be stably and easily controlled to a constant level. Moreover, it is possible to obtain an optical receiver having a wide operating light receiving level range, which is extremely useful in practice.
第１図は本発明の一実施例における光受信器のブロック
図、第２図は従来の光受信器を示すブロック図である。
１・・・・・・ＡＰＤ、２・・・・・・前置増幅器、３
・・・・・・等酒器、４・・・・・・ＤＣ−ＤＣコンバ
ータ、６・・曲比較ａ、６・・・・・・差動増幅器。
代理人の氏名 弁理士 粟 野 重 孝 はが１名第
１／？Ｍ？ １
図
嬉
図FIG. 1 is a block diagram of an optical receiver according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional optical receiver. 1...APD, 2...Preamplifier, 3
・・・・・・Liquor cup, 4：DC-DC converter, 6：Song comparison a, 6：Differential amplifier. Name of agent: Patent attorney Shigetaka Awano Haga 1 person No. 1/? M? 1 Illustration
Claims (1)
アース側に接続した抵抗の両端の電圧を入力する比較器
と、上記比較器の出力信号を入力することにより利得を
制御する前置増幅器から構成することを特徴とする光受
信器。Before controlling the gain by connecting two resistors in series between the APD and ground, and inputting the voltage across the resistor connected to the ground side, and the comparator inputting the output signal of the above comparator. An optical receiver comprising a stationary amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102601A JPH02280516A (en) | 1989-04-21 | 1989-04-21 | optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102601A JPH02280516A (en) | 1989-04-21 | 1989-04-21 | optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02280516A true JPH02280516A (en) | 1990-11-16 |
Family
ID=14331756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1102601A Pending JPH02280516A (en) | 1989-04-21 | 1989-04-21 | optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02280516A (en) |
-
1989
- 1989-04-21 JP JP1102601A patent/JPH02280516A/en active Pending
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