JPH02280512A - Optical receiver - Google Patents
Optical receiverInfo
- Publication number
- JPH02280512A JPH02280512A JP1102607A JP10260789A JPH02280512A JP H02280512 A JPH02280512 A JP H02280512A JP 1102607 A JP1102607 A JP 1102607A JP 10260789 A JP10260789 A JP 10260789A JP H02280512 A JPH02280512 A JP H02280512A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- pulse
- apd
- voltage
- 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 title claims description 16
- 230000010355 oscillation Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract description 2
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
- Optical Communication System (AREA)
- Light Receiving Elements (AREA)
Abstract
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ＡＰＤ （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 an APD (avalanche photodiode) light receiving element 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４図に示すような
構成であった。光信号はＡＰＤ５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。2. Description of the Related Art A conventional optical receiver using an APD has a configuration as shown in FIG. The optical signal is converted into a current signal by the APD 5 and amplified by the charging current multiplication effect.
ＡＰＤ５の出力電流信号は前置増幅器７の入力インピー
ダンスと負荷抵抗６により電圧信号に変換され、前置増
幅器７、および増幅器８により増幅され、等制器９によ
り波形整形して出力端子１０より出力信号が出力される
。また、出力信号をピーク検出回路１９、電圧制御回路
２０、昇圧トランスで構成したＤＣ−ＤＣコンバータ２
１１：Ｊ：す、ＡＰＤ５の印加電圧を変化させることに
より、ＡＰＤの電流増倍率を変化させ、出力信号を一定
にするＡＧＣ回路を構成し、幅広い受光レベルで動作可
能としていた。The output current signal of the APD 5 is converted into a voltage signal by the input impedance of the preamplifier 7 and the load resistance 6, amplified by the preamplifier 7 and amplifier 8, waveform shaped by the equalizer 9, and output from the output terminal 10. A signal is output. In addition, a DC-DC converter 2 comprising an output signal, a peak detection circuit 19, a voltage control circuit 20, and a step-up transformer.
11:J: By changing the voltage applied to the APD 5, the current multiplication factor of the APD was changed, and an AGC circuit was configured to keep the output signal constant, making it possible to operate at a wide range of light reception levels.
発明が解決しようとする課題
ＡＰＤには出力信号のＳ／Ｎ （信号／雑音の比）を最
良にする最適充電流増倍率があり、ＡＰＤ印加電圧を調
整することにより可能となる。しかし、このような従来
の構成では、受光レベル低下に伴って、出力信号を一定
にするためにＡＰＤの印加電圧は最適な印加電圧より高
くなり、出力信号のＳ／Ｎが急激に劣化し、動作受光レ
ベル範囲が狭くなるという課題があった。Problems to be Solved by the Invention The APD has an optimal charging current multiplication factor that optimizes the S/N (signal/noise ratio) of the output signal, and this can be achieved by adjusting the voltage applied to the APD. However, in such a conventional configuration, as the received light level decreases, the voltage applied to the APD becomes higher than the optimal voltage in order to keep the output signal constant, and the S/N of the output signal deteriorates rapidly. There was a problem that the operating light receiving level range became narrower.
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ＡＰＤ印加電圧の最適化することにより、動作受光
レベル範囲の広い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 is intended to solve these problems, and aims to provide an optical receiver with a wide operating light reception level range by optimizing the APD applied voltage with a simple configuration.
課題を解決するための手段
本発明は、上記課題を解決するために、パルス発振回路
の出力パルス信号をパルス振幅調整回路に人力し、パル
ス振幅を調整した出力パルス信号を倍電圧整流回路に入
力することにより高電圧を得て、この高電圧を積分回路
に入力して直流高電圧にしてＰＡＤに印加して光受信器
を構成する。Means for Solving the Problems In order to solve the above problems, the present invention provides a method in which the output pulse signal of a pulse oscillation circuit is manually inputted to a pulse amplitude adjustment circuit, and the output pulse signal whose pulse amplitude has been adjusted is inputted to a voltage doubler rectifier circuit. By doing so, a high voltage is obtained, and this high voltage is input to an integrating circuit to be converted into a DC high voltage and applied to the PAD to configure an optical receiver.
作用
このような構成により、ＡＰＤ印加電圧の最適化により
、動作受光レベル範囲に広い光受信器を得ることができ
る。Effect: With such a configuration, an optical receiver with a wide operating light reception level range can be obtained by optimizing the APD applied voltage.
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はパルス信号発生器、２はノ（ルス撮幅調整
回路、３は倍電圧整流回路、４は積分回路、５はＡＰＤ
、６は負荷抵抗、７は前置増幅器、８は増幅器、９は等
制器、１０は出力端子である。Embodiment FIG. 1 is a block diagram of an optical receiver showing an embodiment of the present invention. 1 is a pulse signal generator, 2 is a pulse width adjustment circuit, 3 is a voltage doubler rectifier circuit, 4 is an integration circuit, 5 is an APD
, 6 is a load resistor, 7 is a preamplifier, 8 is an amplifier, 9 is an equalizer, and 10 is an output terminal.
パルス信号発生器１は出力パルス信号をパルス振幅調整
回路２に入力し、出力パルスの振幅を調整する。パルス
振幅調整回路２の出力パルス信号は倍電圧整流回路３に
入力し高電圧を得る。この高電圧は、抵抗１１とコンデ
ンサ１２により構成した積分回路４により整流し直流高
電圧に変換し、ＡＰＤ５のカソードに印加する。The pulse signal generator 1 inputs an output pulse signal to a pulse amplitude adjustment circuit 2 to adjust the amplitude of the output pulse. The output pulse signal of the pulse amplitude adjustment circuit 2 is input to a voltage doubler rectifier circuit 3 to obtain a high voltage. This high voltage is rectified and converted into a DC high voltage by an integrating circuit 4 constituted by a resistor 11 and a capacitor 12, and is applied to the cathode of the APD 5.
光信号は、ＡＰＤ５により電流信号に変換されるととも
に、直流高電圧により充電流増倍作用によって電流増幅
され、負荷抵抗６により電圧信号に変換し、前置増幅器
７、増幅器８により増幅され、等制器９により波形整形
して出力される。低受光レベル時、出力信号のＳ／Ｎが
最良になるように、パルス振幅調整回路２の出力パルス
振幅を調整し、ＡＰＤ５に印加する直流高電圧をＡＰＤ
５の最適充電流増倍率を得る。The optical signal is converted into a current signal by the APD 5, current amplified by a charging current multiplication effect using a DC high voltage, converted into a voltage signal by a load resistor 6, amplified by a preamplifier 7, an amplifier 8, etc. The waveform is shaped by the controller 9 and output. When the received light level is low, the output pulse amplitude of the pulse amplitude adjustment circuit 2 is adjusted so that the S/N of the output signal is the best, and the DC high voltage applied to the APD 5 is adjusted so that the S/N of the output signal is the best.
An optimal charge current multiplication factor of 5 is obtained.
倍電圧整流回路３は、コツククロフト回路とも呼ばれ、
この一実施例を第２図に示す。この回路は、入力パルス
信号を複数個のダイオード群１５と複数個のコンデンサ
群１６によりコンデンサに充電して直流高電圧を得るこ
とができる。倍電圧整流回路３のコンデンサ群１６の容
量値を小さ（すると出力許容電流値が小さくなり、第３
図の倍電圧整流回路出力特性１７に示すように出力電流
が増加すると出力電圧が低下する。このため、倍電圧整
流回路をＡＰＤ印加電圧用回路として用いると、光信号
レベルが増加すると、ＡＰＤ素子に流れる電流が増加し
、これに伴って、倍電圧整流回路の出力高電圧も低下す
る。また、積分回路４を構成している抵抗１１、および
、抵抗１２によってもＡＰＤ５の端子間の電圧降下を生
じる。The voltage doubler rectifier circuit 3 is also called a Kotsukucroft circuit,
An example of this is shown in FIG. This circuit can obtain a DC high voltage by charging a capacitor with an input pulse signal using a plurality of diode groups 15 and a plurality of capacitor groups 16. Decrease the capacitance value of the capacitor group 16 of the voltage doubler rectifier circuit 3 (this will reduce the output allowable current value, and
As shown in voltage doubler rectifier circuit output characteristic 17 in the figure, as the output current increases, the output voltage decreases. Therefore, when a voltage doubler rectifier circuit is used as an APD applied voltage circuit, when the optical signal level increases, the current flowing through the APD element increases, and accordingly, the output high voltage of the voltage doubler rectifier circuit also decreases. Further, a voltage drop between the terminals of the APD 5 also occurs due to the resistor 11 and the resistor 12 that constitute the integrating circuit 4.
積分回路出力は第２図に示す積分回路出力特性１８とな
る。このように積分回路４の抵抗の値により直流高電圧
の低下の傾きを調整することが可能となる。The integrating circuit output has an integrating circuit output characteristic 18 shown in FIG. In this way, the slope of the drop in the DC high voltage can be adjusted by the value of the resistance of the integrating circuit 4.
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
な構成で任意の直流高電圧を得ることができ、光信号レ
ベルが増加するとＡＰＤの印加電圧が低下することによ
って、自動的にＡＰＤの充電流増倍率が低下し、無帰還
で応答速度の速いＡＧＣ回路を構成することが可能とな
るとともに、低受光レベル時はＡＰＤの最適電流増倍率
に調整した印加電圧となり、動作受光レベル範囲を広い
光受信器となる。さらに、昇圧トランスを用いたＤＣ−
ＤＣコンバータを使用していないためパルス信号の振幅
を大きくする必要がないため低ノイズであり、小形・低
価格が図れるため実用的に極めて有用である。Effects of the Invention As described above, according to the present invention, any desired DC high voltage can be obtained with an extremely simple configuration, and when the optical signal level increases, the voltage applied to the APD decreases, thereby automatically The charge current multiplication factor of the APD is reduced, making it possible to configure an AGC circuit with no feedback and a fast response speed.At the same time, when the received light level is low, the applied voltage is adjusted to the optimal current multiplication factor of the APD, and the operating light receiving It becomes an optical receiver with a wide level range. Furthermore, DC-
Since it does not use a DC converter, there is no need to increase the amplitude of the pulse signal, resulting in low noise, and it is extremely useful in practice because it can be made compact and inexpensive.
第１図は本発明の一実施例における光受信器のΦ
ブロック図、第２図は倍電圧整流回路′ビー実施例１略
図、第３図は倍電圧整流回路および積分回路の出力特性
図、第４図は従来の光受信器を示すブロック図である。
ｌ・・・・・・パルス発振回路、２・・・・・・パルス
振幅調整回路、３・・・・・・倍電圧整流回路、４・・
・・・・積分回路、５・・・・・・ＡＰＤ、６・・・・
・・負荷抵抗、７・旧・・前置増幅器、８・・・・・・
増幅器、９・・・・・・等酒器、１ｏ・・・・・・出力
端子、１１・・・・・・抵抗、１２・・・・・・コンデ
ンサ、１３・・・・・・パルス入力端子、１４・・・・
・・高電圧出力端子、１５・・・・・・ダイオード群、
１６・・・・・・コンデンサ群、１７・・・・・・倍電
圧整流回路出力特性、１８・旧・・積分回路出力特性。
代理人の氏名 弁理士 粟野重孝 ほか１名≦負荷氾抗Fig. 1 is a Φ block diagram of an optical receiver according to an embodiment of the present invention, Fig. 2 is a schematic diagram of the voltage doubler rectifier circuit 'B Embodiment 1, and Fig. 3 is an output characteristic diagram of the voltage doubler rectifier circuit and the integrating circuit. FIG. 4 is a block diagram showing a conventional optical receiver. l... Pulse oscillation circuit, 2... Pulse amplitude adjustment circuit, 3... Voltage doubler rectifier circuit, 4...
...Integrator circuit, 5...APD, 6...
...Load resistance, 7.Old...Preamplifier, 8...
Amplifier, 9... etc. Liquor cup, 1o... Output terminal, 11... Resistor, 12... Capacitor, 13... Pulse input Terminal, 14...
...High voltage output terminal, 15...Diode group,
16...Capacitor group, 17...Voltage doubler rectifier circuit output characteristics, 18. Old...Integrator circuit output characteristics. Name of agent: Patent attorney Shigetaka Awano and 1 other person ≦ Load flood protection
Claims (1)
に入力し、上記パルス振幅調整回路の出力パルス信号を
倍電圧整流回路に入力し、上記倍電圧整流回路の出力高
電圧を積分回路に入力し、上記積分回路の出力直流高電
圧をＡＰＤに印加することを特徴とする光受信器。inputting the output pulse signal of the pulse oscillation circuit to a pulse amplitude adjustment circuit, inputting the output pulse signal of the pulse amplitude adjustment circuit to a voltage doubler rectifier circuit, inputting the output high voltage of the voltage doubler rectifier circuit to an integrating circuit, An optical receiver characterized in that the output DC high voltage of the integrating circuit is applied to an APD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102607A JPH02280512A (en) | 1989-04-21 | 1989-04-21 | Optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102607A JPH02280512A (en) | 1989-04-21 | 1989-04-21 | Optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02280512A true JPH02280512A (en) | 1990-11-16 |
Family
ID=14331927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1102607A Pending JPH02280512A (en) | 1989-04-21 | 1989-04-21 | Optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02280512A (en) |
-
1989
- 1989-04-21 JP JP1102607A patent/JPH02280512A/en active Pending
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