JPS6014293B2 - optical receiver circuit - Google Patents
optical receiver circuitInfo
- Publication number
- JPS6014293B2 JPS6014293B2 JP54171044A JP17104479A JPS6014293B2 JP S6014293 B2 JPS6014293 B2 JP S6014293B2 JP 54171044 A JP54171044 A JP 54171044A JP 17104479 A JP17104479 A JP 17104479A JP S6014293 B2 JPS6014293 B2 JP S6014293B2
- Authority
- JP
- Japan
- Prior art keywords
- bias voltage
- temperature
- optical
- reception level
- optical receiver
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 title claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Light Receiving Elements (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明はアバランシェフオトダィオードを用いた光受信
回路に係り、特に動作中の光通信系を断にすることなく
このアバランシエフオトダイオ−ドの光受信レベルを監
視でき、光受信回路に付加して好適な光受信レベル監視
回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical receiving circuit using an avalanche photodiode, and in particular, to monitoring the optical reception level of the avalanche photodiode without interrupting the operating optical communication system. The present invention relates to an optical reception level monitoring circuit that can be added to an optical reception circuit.
従釆の光通信においては、信号系を断にすることなく、
受信回路への入力光のパワーを測定することができなか
った。In conventional optical communications, without interrupting the signal system,
It was not possible to measure the power of the input light to the receiving circuit.
本発明は、この様な点に鑑みてなされたもので、回線を
断にすることなく入力光のパワーをモニタすることによ
り、送信パワーの劣化や光フアィバ線路の減衰量を等を
監視できる様にした。The present invention has been made in view of these points, and it is possible to monitor the deterioration of the transmission power, the amount of attenuation of the optical fiber line, etc. by monitoring the power of input light without disconnecting the line. I made it.
本発明は受光素子のバイアス電圧をコントロールして、
その増倍率を制御してＡＧＣとしている光受信回路では
、光入力レベルとバイアス電圧が対応して動くことに着
目して、このバイアス電圧の値を検出する検出手段と、
この検出手段が検出したバイアス電圧値の温度変動を補
償する温度補償手段とを備え、該温度補償手段の出力信
号により光受信レベルを監視する光受信レベル監視回路
を提供し、上記目的を達成するものである。以下本発明
を実施例に基づいて説明する。図は、本発明の実施例を
示す図で、図中、ＲはＡＰＤのバイアス電圧Ｖ＾Ｐｏ検
出用の抵抗、ＲＴはサーミスタ、ＯＰはオベアンプ、Ｒ
″ま帰還抵抗である。The present invention controls the bias voltage of the light receiving element,
In an optical receiving circuit that uses AGC by controlling the multiplication factor, a detection means detects the value of the bias voltage by focusing on the fact that the optical input level and the bias voltage move in correspondence;
The above object is achieved by providing an optical reception level monitoring circuit comprising temperature compensation means for compensating for temperature fluctuations in the bias voltage value detected by the detection means, and monitoring the optical reception level by the output signal of the temperature compensation means. It is something. The present invention will be explained below based on examples. The figure shows an embodiment of the present invention. In the figure, R is a resistor for detecting the bias voltage V^Po of the APD, RT is a thermistor, OP is an obeamp, and R
``It is a feedback resistance.
動作を説明すると、ＡＰＤのバイアス電圧を抵抗Ｒで取
り出し、これをサーミスタＲ’を介して、オベアンプＯ
Ｐの“一”端子に入力する。To explain the operation, the bias voltage of the APD is taken out by the resistor R, and it is sent to the amplifier O via the thermistor R'.
Input to the “1” terminal of P.
オベアンプＯＰの“十”端子には、固定電源を接続する
。この構成により、ＡＰＤのバイアス電圧を温度補償し
て検出しているが、このことを更に詳細に説明する。Ａ
ＰＤの糟倍利得Ｍとバイアス電圧の関係は温度により変
化し、一定のＭを得るバイアス電圧の温度変動△Ｖ＾Ｐ
ｏはＶ＾Ｐ。Connect a fixed power supply to the “10” terminal of the obeamp OP. With this configuration, the bias voltage of the APD is detected with temperature compensation, which will be explained in more detail. A
The relationship between the PD multiplier gain M and the bias voltage changes depending on the temperature, and the temperature variation of the bias voltage to obtain a constant M is △V^P
o is V^P.
＝Ｖ＾Ｐ。（Ｔ。）・ＣＴＨ・（Ｔ−Ｔ。） ……｛１
｝という関係をもつ。ここで、Ｖ＾Ｐｏ（Ｔｏ）は温度
Ｔｏにおけるバイアス電圧、Ｃ州はＶ＾Ｐｏの温度係数
、（Ｔ−Ｔｏ）は温度の変化分である。=V^P. (T.)・CTH・(T-T.) ……{1
}. Here, V^Po(To) is the bias voltage at temperature To, C is the temperature coefficient of V^Po, and (T-To) is the change in temperature.
この様に光受信レベルが一定にも拘らず温度が変わると
バイアス電圧が変化する。In this way, even though the optical reception level is constant, when the temperature changes, the bias voltage changes.
したがってこういう場合にはその変化分を打ち消す必要
がある。このため本発明では、このＡＰＤのバイアス電
圧Ｖ＾Ｐｏの温度特性をサーミスタＲＴを用いた補償回
路で精度よく補償する。Therefore, in this case, it is necessary to cancel out the change. Therefore, in the present invention, the temperature characteristics of the bias voltage V^Po of the APD are accurately compensated by a compensation circuit using a thermistor RT.
図の回路における出力電圧ＶｏＵでの温度変動△ＶＯＵ
Ｔはげ ．△Ｖｉ
△ＶｏＵ’＝△ｒＴ
となる。Temperature fluctuation △VOU at output voltage VoU in the circuit shown in the figure
T-bald. △Vi △VoU'=△rT.
ここで△ｒ，はＴＯＯからＴ〇に変化した場合のサーミ
スタＲＴと抵抗Ｒの合成インピーダンスの変化を、ｒハ
ま帰還抵抗Ｒ５のインピーダンスを、△Ｖｉはサーミス
タＲＴに加わる電圧ｙｉのＴｏｏからＴｏ まで変化し
た場合の変化分を示す。Here, △r, is the change in the combined impedance of the thermistor RT and the resistor R when changing from TOO to T〇, r is the impedance of the feedback resistor R5, and △Vi is the change of the voltage yi applied to the thermistor RT from Too to Too. This shows the amount of change when the value changes to .
ＲｏをサーミスタＲＴと抵抗Ｒの温度Ｔにおける合成イ
ンピーダンスとすると、△ｒＴは△ｒＴ＝Ｋ●Ｒ。（Ｔ
−ふ）となり、△Ｖｏｕ，は△ＶＯＵＴ＝ｒ〆・Ｇ‐Ｖ
＾ＰＤ」−？。If Ro is the combined impedance of thermistor RT and resistor R at temperature T, then △rT is △rT=K●R. (T
-F), △Vou, is △VOUT=r〆・G-V
^PD”-? .
）ｑＴ−Ｔ。）Ｋ・Ｒ。（Ｔ−Ｔ。）ｒ〆．ＧＨ．Ｖ＾
Ｐｏ（Ｔｏ）
− Ｋ．Ｒ。)qT-T. )K.R. (T-T.) r〆. G.H. V^
Po(To)-K. R.
と表わせ、精度よく温度補償できる。The temperature can be compensated with high accuracy.
以上述べた様に、本発明によれば、ＡＰＤのバイアス電
圧を検出して受信レベルを監視する時に温度補償を行な
っているので、精度のよいレベル艦視を行なうことがで
きる。As described above, according to the present invention, since temperature compensation is performed when detecting the bias voltage of the APD and monitoring the reception level, highly accurate level observation can be performed.
図は本発明の実施例を示す図で、図中Ｒは抵抗、ＲＴは
サーミスタ、ＯＰはオベアンプである。The figure shows an embodiment of the present invention, in which R is a resistor, RT is a thermistor, and OP is an oven amplifier.
Claims (1)
い、該アバランシエフオトダイオードの出力を一定にす
る様にバイアス電圧を制御する光受信回路に付加された
該アバランシエフオトダイオードの光受信レベルを監視
する光受信レベル監視回路であって、 前記バイアス電
圧の値を検出する検出手段と、該検出手段が検出したバ
イアス電圧値の温度変動を補償する温度補償手段とを備
え、該温度補償手段の出力信号により、前記光受信レベ
ルを監視することを特徴とする光受信レベル監視回路。1. An optical receiver that uses an avalanche photodiode as a light receiving element and monitors the optical reception level of the avalanche photodiode, which is added to an optical receiver circuit that controls a bias voltage so as to keep the output of the avalanche photodiode constant. A level monitoring circuit, comprising a detection means for detecting the value of the bias voltage, and a temperature compensation means for compensating for temperature fluctuations in the bias voltage value detected by the detection means, and according to an output signal of the temperature compensation means, An optical reception level monitoring circuit that monitors the optical reception level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54171044A JPS6014293B2 (en) | 1979-12-28 | 1979-12-28 | optical receiver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54171044A JPS6014293B2 (en) | 1979-12-28 | 1979-12-28 | optical receiver circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5694226A JPS5694226A (en) | 1981-07-30 |
| JPS6014293B2 true JPS6014293B2 (en) | 1985-04-12 |
Family
ID=15916041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54171044A Expired JPS6014293B2 (en) | 1979-12-28 | 1979-12-28 | optical receiver circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6014293B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2733763B2 (en) * | 1987-01-30 | 1998-03-30 | 日本電信電話株式会社 | APD bias circuit |
| JPH0370223A (en) * | 1989-08-09 | 1991-03-26 | Fujitsu Ltd | Minimum light receiving level stabilizing method for light receiving circuit |
-
1979
- 1979-12-28 JP JP54171044A patent/JPS6014293B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5694226A (en) | 1981-07-30 |
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