JPS63105541A - Optical receiver - Google Patents

Optical receiver

Info

Publication number
JPS63105541A
JPS63105541A JP61251122A JP25112286A JPS63105541A JP S63105541 A JPS63105541 A JP S63105541A JP 61251122 A JP61251122 A JP 61251122A JP 25112286 A JP25112286 A JP 25112286A JP S63105541 A JPS63105541 A JP S63105541A
Authority
JP
Japan
Prior art keywords
photodiode
apd
avalanche photodiode
optimum
signal
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.)
Granted
Application number
JP61251122A
Other languages
Japanese (ja)
Other versions
JPH0687549B2 (en
Inventor
Manabu Tanabe
学 田辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP61251122A priority Critical patent/JPH0687549B2/en
Publication of JPS63105541A publication Critical patent/JPS63105541A/en
Publication of JPH0687549B2 publication Critical patent/JPH0687549B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Light Receiving Elements (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To attain control giving an optimum multiplication factor to an avalanche photodiode by utilizing a reflected light decreasing the quantization efficiency of the avalanche photodiode so as to monitor the level of a received power at all times. CONSTITUTION:An optical signal from an optical fiber 9 is projected to the avalanche photodiode (APD) 7 and most of the signal is converted into a current, a part is reflected in the photodetecting face and made incident in a photodiode 8. An output current from the photodiode 8 is increased/decreased in proportion to the optical power of the reflected power to recognize the level of the photodetection power radiated to the APD 7. Based on the photodetection power, the optimum multiplication factor of the APD 7 is decided. An optimum signal generator 10 outputs a signal the same as the output current of the APD 7 at the optimum multiplier rate, an operational amplifier 12 compares the output with the actual output from the APD 7 to control the bias voltage applied to the APD 7 through a bias control section 12 thereby making the both equal to each other.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、光通信の分野で使用される、アバランシェ・
フォトダイオード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 is directed to an avalanche system used in the field of optical communications.
This invention relates to an optical receiver using a photodiode.

従来の技術 従来のアバランシェ・フォトダイオードを受光素子とし
て使用した光受信器には、例えば第3図のようなものが
ある。第3図において、1はアバランシェ・フォトダイ
オード、2はプリアンプ、3は可変利得アンプ、4は振
幅検出器、5はAGC(Automatic Ga1n
 Contorl )  回路である。光受信器の出力
電気信号6の振幅は、振幅検出器4で大きさを検出され
、その大きさに応じてAGC回路6が可変利得アンプ2
の利得およびアバランシェ・フォトダイオード1の増倍
率を変化することによって、受光電力が変動しても一定
となるように制御される。
2. Description of the Related Art An example of an optical receiver using a conventional avalanche photodiode as a light receiving element is shown in FIG. In Fig. 3, 1 is an avalanche photodiode, 2 is a preamplifier, 3 is a variable gain amplifier, 4 is an amplitude detector, and 5 is an AGC (Automatic Ga1n
Control) circuit. The amplitude of the output electrical signal 6 of the optical receiver is detected by the amplitude detector 4, and the AGC circuit 6 outputs the variable gain amplifier 2 according to the detected magnitude.
By changing the gain of the avalanche photodiode 1 and the multiplication factor of the avalanche photodiode 1, it is controlled to remain constant even if the received light power fluctuates.

一方、アバランシェ・フォトダイオード1の増倍率には
、出力電気信号のSN比を最大とする受光電力によって
決まる最適値が存在することが知られている。しかしな
がら、上記のような構成の光受信器では、受光電力を直
接知ることができないために、アバランシェ・フすトダ
イオードが常に最適増倍率をとるように制御することは
難しい。
On the other hand, it is known that the multiplication factor of the avalanche photodiode 1 has an optimum value determined by the received light power that maximizes the S/N ratio of the output electrical signal. However, in the optical receiver configured as described above, since the received light power cannot be directly known, it is difficult to control the avalanche star diode so that it always takes the optimum multiplication factor.

このため、従来の光受信器では、最小受光電力において
最適増倍率をとるように利得を調節し、それ以上の受光
電力では可変利得アンプ3の利得とアバランシェ・フォ
トダイオード1の増倍率Mをどちらか片方のみを変化さ
せる方法がとられることが多い。
For this reason, in conventional optical receivers, the gain is adjusted to take the optimum multiplication factor at the minimum received light power, and when the received light power is higher than that, the gain of the variable gain amplifier 3 and the multiplication factor M of the avalanche photodiode 1 are adjusted. In many cases, a method is used in which only one of the two is changed.

発明が解決しようとする問題点 光ファイバあるいは光源からの光信号は、アバランシェ
・フォトダイオード1に照射され、そこで大部分が電気
信号に変換されるが、その一部はアバランシェ・フォト
ダイオード1の受光面で反射されてしまう。この反射光
は、アバランシェ・フォトダイオード1の電子効率を低
下させる一因となっていた。
Problem to be Solved by the Invention An optical signal from an optical fiber or a light source is irradiated onto the avalanche photodiode 1, where most of it is converted into an electrical signal, but some of it is received by the avalanche photodiode 1. It gets reflected off the surface. This reflected light was a factor in reducing the electronic efficiency of the avalanche photodiode 1.

本発明はかかる点に鑑み、アバランシェ・フォトダイオ
ードにおける反射光を利用して受光電力の大きさをモニ
ターし、アバランシェ・フォトダイオードが最適増倍率
をとる制御を実現させる光受信器を提供することを目的
とする。
In view of the above, the present invention aims to provide an optical receiver that monitors the magnitude of received light power using reflected light from an avalanche photodiode, and realizes control in which the avalanche photodiode takes an optimal multiplication factor. purpose.

問題点を解決するだめの手段 本発明は、光受信器において、光ファイバまたは光源か
ら光信号が照射されるアバランシェ・フォトダイオード
と、そのアバランシェ・フォトダイオードからの光信号
の反射光を受ける光電素子とを有することを特徴とする
光受信器である。
Means for Solving the Problems The present invention provides an optical receiver that includes an avalanche photodiode to which an optical signal is irradiated from an optical fiber or a light source, and a photoelectric element that receives reflected light of the optical signal from the avalanche photodiode. An optical receiver is characterized in that it has:

作  用 前記の構成により、光電素子が受光したアバランシェ・
フォトダイオード反射光の光電力からアバランシェ・フ
ォトダイオードに照射されている受光電力の大きさを知
り、この大きさをもとにアバランシェ・フォトダイオー
ドが最適増倍率をとるように制御する。
Operation With the above configuration, the avalanche light received by the photoelectric element is
The magnitude of the received light power irradiated to the avalanche photodiode is determined from the optical power of the light reflected by the photodiode, and based on this magnitude, the avalanche photodiode is controlled so as to take the optimum multiplication factor.

実施例 第1図は本発明の実施例の光受信器に使用するアバラン
シェ曇フォトダイオード・モジュールの断面図を、第2
図にこのモジュールを用いた光受信器のブロック図を示
す。第1図において7はアバラン7エφフオトダイオー
ドであり、8は受光電力モニター用の光電素子であるフ
ォトダイオード、9は光ファイバである。また、第2図
において7,8は第1図と同様にそれぞれアバランシェ
・フォトダイオード、フォトダイオードであり、10は
フォトダイオード8の出力電流値に対応した信号を出力
する最適信号値発生器、11は最適信号値発生器1oの
出力とアバランシェ−フォトダイオ−ドアからの出力の
大きさを比較する演算増幅器、12は演算増幅器11の
結果によってアバランシェ・フォトダイオード10に印
加されるバイアス電圧を制御するバイアス制御部である
Embodiment FIG. 1 shows a cross-sectional view of an avalanche fog photodiode module used in an optical receiver according to an embodiment of the present invention, and FIG.
The figure shows a block diagram of an optical receiver using this module. In FIG. 1, 7 is an Avalan 7F photodiode, 8 is a photodiode which is a photoelectric element for monitoring received light power, and 9 is an optical fiber. Further, in FIG. 2, 7 and 8 are an avalanche photodiode and a photodiode, respectively, as in FIG. 1, and 10 is an optimum signal value generator that outputs a signal corresponding to the output current value of the photodiode 8; 12 is an operational amplifier that compares the magnitude of the output of the optimum signal value generator 1o and the output from the avalanche photodiode 10, and 12 controls the bias voltage applied to the avalanche photodiode 10 according to the result of the operational amplifier 11. This is a bias control section.

以上のように構成された本実施例の光受信器について、
以下にその動作を説明する。
Regarding the optical receiver of this embodiment configured as above,
The operation will be explained below.

第1図において、光ファイバ9からの光信号は、アバラ
ンシェ・フォトダイオード7に照射され、大部分が電流
に変換されるが、一部は受光面で反射される。一方、フ
ォトダイオード8は光ファイバ9からの光信号を遮らず
しかもアバランシェ・フォトダイオード7における反射
光のすべであるいはその一部を決まった割合で受光でき
るように配置する。このフォトダイオード8からの出力
電流は、反射光の光電力に正比例して増減するので。
In FIG. 1, an optical signal from an optical fiber 9 is irradiated onto an avalanche photodiode 7, and most of it is converted into current, but a portion is reflected by the light receiving surface. On the other hand, the photodiode 8 is arranged so that it does not block the optical signal from the optical fiber 9 and can receive all or part of the light reflected by the avalanche photodiode 7 at a predetermined ratio. The output current from the photodiode 8 increases or decreases in direct proportion to the optical power of the reflected light.

この電流値と前もって測定しておいたアバランシェ・フ
ォトダイオード7の受光面における反射率とからアバラ
ンシェ・フォトダイオード7に照射されている受光電力
の大きさを知ることができる。
The magnitude of the received light power irradiated to the avalanche photodiode 7 can be determined from this current value and the reflectance on the light receiving surface of the avalanche photodiode 7 measured in advance.

そして、この受光電力の値をもとにこの時のアバランシ
ェ・フォトダイオ−ドアの最適増倍率を決めることがで
きる。最適信号値発生器1oは、この最適増倍率におけ
るアバランシェ・フォトダイオード7の出力電流と同じ
大きさの信号を出力するようにしておく。そして、演算
増幅器12でこの出力とアバランシェ・フォトダイオー
ド7からの実際の出力の大きさを比較して後者の方が小
さい場合バイアス制御部12を通じてアバランシェ・フ
ォトダイオード7に印加されるバイアス電圧を上げ、反
対に後者が大きい場合にはバイアス電圧を下げて両者が
同じになるように制御する。このような構成とすること
によって、常にアバランシェ・フォトダイオード7の増
倍率を最適とする制御を実現することが可能となる。
Then, based on the value of the received light power, the optimum multiplication factor of the avalanche photodiode at this time can be determined. The optimum signal value generator 1o is configured to output a signal having the same magnitude as the output current of the avalanche photodiode 7 at this optimum multiplication factor. Then, the operational amplifier 12 compares this output with the actual output from the avalanche photodiode 7, and if the latter is smaller, the bias voltage applied to the avalanche photodiode 7 is increased through the bias control unit 12. On the other hand, if the latter is large, the bias voltage is lowered and controlled so that the two become the same. With such a configuration, it becomes possible to realize control that always optimizes the multiplication factor of the avalanche photodiode 7.

なお、フォトダイオード8からの出力は、それほど速い
応答が要求されないので十分広い受光面で受光できるう
えに高いSN比も必要とされないので、フォトダイオー
ド8に照射される光信号の反射光がごくわずかでも、上
記の制御が可能である。
Note that the output from the photodiode 8 does not require a very fast response, can be received over a sufficiently wide light-receiving surface, and does not require a high signal-to-noise ratio, so the reflected light of the optical signal irradiated to the photodiode 8 is negligible. However, the above control is possible.

発明の詳細 な説明したように、本発明によれば、アバランシェ・フ
ォトダイオードの量子効率を低下させていた反射光を利
用して、受光電力の大きさを常時モニターでき、アバラ
ンシェ・フォトダイオードが最適増倍率をとったときの
電気信号を出力する光受信器を簡単に実現きせることか
できる。
As described in detail, according to the present invention, the magnitude of the received light power can be constantly monitored by using reflected light, which lowers the quantum efficiency of avalanche photodiodes, and avalanche photodiodes are optimal. It is possible to easily realize an optical receiver that outputs an electrical signal when the multiplication factor is taken.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の光受信器に用いたアバラン
シェ拳フォトダイオード・モジュールの要部概念図、第
2図は本発明の一実施例の光受信器のブロック構成図、
第3図はアバランシェ・フォトダイオードを用いた従来
の光受信器のブロック構成図である。 7・・・・・・アバランシェ−フォトダイオード、8・
・・・・・フォトダイオード、9・・・・・・光ファイ
バ、10・・・・・・最適信号値発生器、11・・・・
・・バイアス制御部、12・・・・・・演算増幅器。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名で;
1≦ 1 図 第2[4 7アノやランンヱ7ォトダイオード 第3図
FIG. 1 is a conceptual diagram of main parts of an avalanche fist photodiode module used in an optical receiver according to an embodiment of the present invention, and FIG. 2 is a block configuration diagram of an optical receiver according to an embodiment of the present invention.
FIG. 3 is a block diagram of a conventional optical receiver using an avalanche photodiode. 7...Avalanche photodiode, 8.
...Photodiode, 9...Optical fiber, 10...Optimum signal value generator, 11...
...Bias control section, 12... operational amplifier. Name of agent: Patent attorney Toshio Nakao and one other person;
1 ≦ 1 Figure 2 [4 7 Annoya Run 7 Photodiode Figure 3

Claims (1)

【特許請求の範囲】[Claims]  光ファイバまたは光源から光信号が照射されるアバラ
ンシェ・フォトダイオードと、前記アバランシェ・フォ
トダイオードにおける前記光信号の反射光を受ける光電
素子と、前記光電素子からの出力値により前記アバラン
シェ・フォトダイオードの増倍率を制御する機能を有す
ることを特徴とする光受信器。
an avalanche photodiode that is irradiated with an optical signal from an optical fiber or a light source; a photoelectric element that receives reflected light of the optical signal in the avalanche photodiode; An optical receiver characterized by having a function of controlling magnification.
JP61251122A 1986-10-22 1986-10-22 Optical receiver Expired - Lifetime JPH0687549B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61251122A JPH0687549B2 (en) 1986-10-22 1986-10-22 Optical receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61251122A JPH0687549B2 (en) 1986-10-22 1986-10-22 Optical receiver

Publications (2)

Publication Number Publication Date
JPS63105541A true JPS63105541A (en) 1988-05-10
JPH0687549B2 JPH0687549B2 (en) 1994-11-02

Family

ID=17217990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61251122A Expired - Lifetime JPH0687549B2 (en) 1986-10-22 1986-10-22 Optical receiver

Country Status (1)

Country Link
JP (1) JPH0687549B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005093610A (en) * 2003-09-16 2005-04-07 Sumitomo Electric Ind Ltd Optical receiver
US7214924B2 (en) 2003-09-19 2007-05-08 Sumitomo Electric Industries, Ltd. Light-receiving method of an avalanche photodiode and a bias control circuit of the same
US7302193B2 (en) 2003-09-18 2007-11-27 Sumitomo Electric Industries, Ltd. Optical receiver
US7315698B2 (en) 2003-10-22 2008-01-01 Sumitomo Electric Industries, Ltd. Optical module and an optical receiver using the same
US7326905B2 (en) 2003-12-17 2008-02-05 Sumitomo Electric Industries, Ltd. Photodetector and optical receiver
US7366428B2 (en) 2003-09-16 2008-04-29 Sumitomo Electric Indutries, Ltd. Optical receiver

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005093610A (en) * 2003-09-16 2005-04-07 Sumitomo Electric Ind Ltd Optical receiver
US7067854B2 (en) 2003-09-16 2006-06-27 Sumitomo Electric Industries, Ltd. Optical receiver
US7366428B2 (en) 2003-09-16 2008-04-29 Sumitomo Electric Indutries, Ltd. Optical receiver
US7302193B2 (en) 2003-09-18 2007-11-27 Sumitomo Electric Industries, Ltd. Optical receiver
US7214924B2 (en) 2003-09-19 2007-05-08 Sumitomo Electric Industries, Ltd. Light-receiving method of an avalanche photodiode and a bias control circuit of the same
US7282692B2 (en) 2003-09-19 2007-10-16 Sumitomo Electric Industries, Ltd. Light receiving method of an avalanche photodiode and a bias control circuit of the same
US7315698B2 (en) 2003-10-22 2008-01-01 Sumitomo Electric Industries, Ltd. Optical module and an optical receiver using the same
US7326905B2 (en) 2003-12-17 2008-02-05 Sumitomo Electric Industries, Ltd. Photodetector and optical receiver

Also Published As

Publication number Publication date
JPH0687549B2 (en) 1994-11-02

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