JPS5812413A - Automatic gain control circuit for optical receiver and amplifier - Google Patents
Automatic gain control circuit for optical receiver and amplifierInfo
- Publication number
- JPS5812413A JPS5812413A JP56110469A JP11046981A JPS5812413A JP S5812413 A JPS5812413 A JP S5812413A JP 56110469 A JP56110469 A JP 56110469A JP 11046981 A JP11046981 A JP 11046981A JP S5812413 A JPS5812413 A JP S5812413A
- Authority
- JP
- Japan
- Prior art keywords
- output
- automatic gain
- preamplifier
- gain control
- amplifier
- 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
- Optical Communication System (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光受信増巾器の自動利得制御回路に係り、変調
方式のいかんにかかわらず可能で安価な光受信増巾器の
自動利得制御回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic gain control circuit for an optical reception amplifier, and more particularly, to an automatic gain control circuit for an optical reception amplifier that is possible and inexpensive regardless of the modulation method.
従来光通信に使用する受信増巾器の自動利得制御回路と
しては、ディジタル伝送方式では出力波形のピーク電圧
を検出してこの電圧により利得を制御する方式が多く使
用されており、周波数分割多重方式ではパイロット信号
を利用して利得を制御する方式が用いられている。第１
図に従来例のディジタル伝送方式に用いられている光受
信増巾器の自動利得制御回路のブロック図を示し第２図
に従来例のパイロット信号を利用する光受信増巾器の自
動利得制御回路のブロック図を示す。Conventional automatic gain control circuits for receiver amplifiers used in optical communications have often been based on digital transmission systems that detect the peak voltage of the output waveform and control the gain using this voltage. A method is used in which the gain is controlled using a pilot signal. 1st
Figure 2 shows a block diagram of an automatic gain control circuit for an optical receiver amplifier used in a conventional digital transmission system, and Figure 2 shows a conventional automatic gain control circuit for an optical receiver amplifier that uses a pilot signal. The block diagram is shown below.
図中１．１′は受光素子、２．２′は前置増巾器、９′
は伸長器、Ｖｋは基準電圧、氏、、 Ｒ，’、、鳥；。In the figure, 1.1' is the light receiving element, 2.2' is the preamplifier, and 9'
is the stretcher, Vk is the reference voltage, Mr., R,', Bird;.
Ｒ１′は抵抗、ＣＩ、ｈＣ１′はボンデ／すである。R1' is a resistor, CI and hC1' are bonders.
第１図の回路は受光素子１にて受光した光を電気信号に
変換し前置増巾器２にて増巾し自動利得制御器３を介し
電気信号を一定にして出力する。The circuit shown in FIG. 1 converts light received by a light receiving element 1 into an electrical signal, amplifies it in a preamplifier 2, and outputs the electrical signal through an automatic gain controller 3 while keeping it constant.
この場合出力信号のピーク値をピーク検出回路４にて検
出しこれを自動利得制御器３に負饋還し自動利得制御を
行っている。しかしこの回路では振巾変調の如き、ピー
ク値が信号の有無によりかわる通信方式Ｃとは使用出来
ない欠点がある。In this case, the peak value of the output signal is detected by the peak detection circuit 4 and fed back to the automatic gain controller 3 to perform automatic gain control. However, this circuit has the disadvantage that it cannot be used with communication method C, such as amplitude modulation, in which the peak value changes depending on the presence or absence of a signal.
第２図の回路は受光素子１′にて受光した光を電気信号
に変換し前置増巾器２′で増申し、次に廁Ｗｋ刹得制御
＠ ｓ Ｉにて必要なレベル壜で増巾しパイ冒シト信奇
を除く蕾域消＊Ｐ液＠ Ｓ ／を経て電気信号は出力さ
れ為〇一方過償側よ〕送信され九パイロット信号は蕾域
−波器６′にて取出され、パイ胃ット増巾器７’！１６
１器ｓｅｔ経九後伸長器９’にて伸長されその直流電圧
によ）自動利得制御＠ｓ’ｏ利得を調整して自動利得制
御＠ａ’ ０出力が一定になるよう自動利得制御を行９
ているＯしかしζ０回路では送信側に高領なバイロフト
発振器（図示されていｉｋい）中帯域Ｆ波−６′中帯域
消＊−波ｓｓＩが必要とな夛高偵で大形になる欠点があ
、＆。The circuit shown in Figure 2 converts the light received by the light receiving element 1' into an electrical signal, amplifies it with the preamplifier 2', and then increases it with the necessary level bottle in the control unit 2'. The electric signal is outputted through the P liquid @ S / and transmitted to the compensation side, and the nine pilot signals are extracted by the bud region transducer 6'. And pie stomach enlarger 7'! 16
After 1 set, it is expanded by the expander 9' and the DC voltage is used to adjust the gain.Automatic gain control @a' Automatic gain control is performed so that the 0 output is constant. 9
However, the ζ0 circuit requires a high-power virofft oscillator (not shown) and a mid-band F wave-6' mid-band canceler*-wave ssI on the transmitting side, which has the disadvantage of being large in size. a,&.
本発明の１的は上記の欠点ｔなくする九めに変調方式Ｏ
いかんにかかわらず可能で小形で安鯛な光受信増巾器の
自動利得制御回路の提供にあるＯ本発明は上記の目的を
達成するために光受信増巾器の自動利得制御回路におい
て、光電気変換後０１１ｍ成分を含む前置増巾器の出力
を、抵抗と制御電圧による抵抗可変素子にて分割し、光
電気変換をする先入力パワーにかかわらず咳分割点にお
ける直流レベルが一定となるよう、制御電圧による抵抗
可変素子に負饋還をかけることを特徴とする光受信増巾
器の自動利得制御回路である。The first object of the present invention is to eliminate the above-mentioned drawbacks.
To achieve the above object, the present invention provides an automatic gain control circuit for an optical receiver amplifier that is possible, small, and inexpensive regardless of the circumstances. After electrical conversion, the output of the preamplifier containing the 011m component is divided by a variable resistance element using a resistor and a control voltage, and the DC level at the division point is constant regardless of the input power before photoelectric conversion. This is an automatic gain control circuit for an optical receiver amplifier, which is characterized by applying negative feedback to a variable resistance element using a control voltage.
以下本発明の一実施例につき図に従って説明する。第３
図は本発明の実施例の光受信増巾器の自動利得制御（以
下ＡＧＯと称す）回路のブロック図である。An embodiment of the present invention will be described below with reference to the drawings. Third
The figure is a block diagram of an automatic gain control (hereinafter referred to as AGO) circuit of an optical receiver amplifier according to an embodiment of the present invention.
図中１’は受光素子、２＃は前置増巾器、９′は伸長器
、１０＃は後段増巾器、１１＃はＦ Ｂ Ｔ。In the figure, 1' is a light receiving element, 2# is a preamplifier, 9' is an expander, 10# is a rear amplifier, and 11# is an FBT.
氏′は帰還抵抗、曳“は分割抵抗、−“、ＲＩはＡＧＯ
圧縮比を決める抵抗、Ｃ−はコンデンサ、ＣＩ＃は交流
除去用コンデンサ、Ｖｋ”は基準電圧である。Mr' is the feedback resistor, Hiki' is the dividing resistor, -', RI is the AGO
A resistor that determines the compression ratio, C- is a capacitor, CI# is a capacitor for removing AC, and Vk'' is a reference voltage.
動作としては受光素子１’にて受光した光を電気信号に
変換し、前置増巾器２′にて増巾する〇前置増巾器２＃
の出力は抵抗Ｒ４′とＦＦｔＴｌｌ“のドレインＤソー
ス８の間のインピーダンスにより分割される。この分割
点の直流電位をＶＡとする。この直流電位ＶＡを抵絖へ
′を介して伸長器９＃に与える。この場合交流成分はコ
ンデンサＣｌにより除去されＡＧＯの圧縮率は抵抗鳥１
と馬１により定まる。この抵抗値は抵抗Ｒ４＃及びＦＥ
Ｔ１１＃のドレインＤソースＳ間のインピーダンスより
十分高くする。又ＦＢ’ｒｌ １’のドレインＤソース
Ｓの間のインピーダンスはゲー）Ｇへの制御電圧が高け
れば低くなり制御電圧が低ければ高くなる。基準電圧Ｖ
ｋ“ は光入力レベルが基準の値の時、伸長器９“の出
力電圧が、ＦＢ’ｌ’ｌｌ”の制御電圧の中心になるよ
うにする。又分割点の電位■ム（■ムく０）の絶対値は
光入力レベルが下がると小さくなり大きいと大きくなる
。このこ七により光入力レベルか基準値より下がると伸
長器９“の出力電圧は下がりＦＥＴｌ１．’のドレイン
ＤソースＳ間のインピーダンスは高くなり、光入力レベ
ルか基準値より上がると伸長器９′の出力電圧は上がり
ＦＥＴＩ １’のドレインＤソース間のインピーダンス
は低くなりＡＧＯかか、、ｌ！ｌ）ることになり、分割
点の電位■ムの変動が圧縮される。In operation, the light received by the light receiving element 1' is converted into an electrical signal and amplified by the preamplifier 2'.〇Preamplifier 2#
The output of is divided by the impedance between the resistor R4' and the drain D source 8 of FFtTll''.The DC potential at this dividing point is VA.This DC potential VA is sent to the resistor through the expander 9#. In this case, the AC component is removed by the capacitor Cl, and the compression ratio of the AGO is
and horse 1. This resistance value is the resistor R4# and FE
The impedance between the drain and source S of T11# should be sufficiently higher than that of T11#. Also, the impedance between the drain D and the source S of FB'rl1' becomes lower as the control voltage to G is higher and becomes higher as the control voltage is lower. Reference voltage V
k" is set so that when the optical input level is at the reference value, the output voltage of the expander 9" becomes the center of the control voltage of FB'l'll. Also, the potential of the dividing point 0) decreases as the optical input level decreases, and increases as the optical input level increases.As a result of this, when the optical input level decreases below the reference value, the output voltage of the expander 9'' decreases and the output voltage of the FET l1. The impedance between the drain and source S of FETI 1' becomes high, and when the optical input level rises above the reference value, the output voltage of the expander 9' increases, and the impedance between the drain and source of FETI 1' decreases, and the AGO or... ! (l) As a result, fluctuations in the potential at the dividing point are compressed.
従って分割点着こおいては交流成分もＦＥＴＩＩ“のイ
ンピーダンス変化に対応してその変動が圧縮され後綾増
巾器１０′の出力は光入力パワーの変動にかかわらず安
定した信号出力が得られる。従ってこの回路は光入力レ
ベルの大小による、前置増巾器２＃の出力の直流分の変
動でＡＧＯをかけず
帯域消去漏波器等も必要でない。Therefore, at the dividing point, the fluctuations of the alternating current component are compressed in response to changes in the impedance of FET II, and the output of the rear amplifier 10' provides a stable signal output regardless of fluctuations in the optical input power. Therefore, this circuit does not apply an AGO due to fluctuations in the DC component of the output of the preamplifier 2# due to the magnitude of the optical input level, and does not require a band-elimination leaker or the like.
以上詳細にＭした如く本発明によれば変調方式のいかん
にかかわらず、従りてディジタル通信る効果がある。As described in detail above, the present invention is effective in digital communication regardless of the modulation method.
第１図は従来例のディジタル通信方式に用いられる光受
信増巾器のＡＧＯ回路のブロック図、第２図は従来例の
パイロット″信号を利用する光受信増巾器のＡＧＯ回路
のブロック図、第３図は本発明の実施例の光受信増巾器
゛のＡＧＯ回路のブロック図である。Fig. 1 is a block diagram of an AGO circuit of an optical receiving amplifier used in a conventional digital communication system, and Fig. 2 is a block diagram of an AGO circuit of a conventional optical receiving amplifier using a pilot'' signal. FIG. 3 is a block diagram of an AGO circuit of an optical receiver amplifier according to an embodiment of the present invention.
Claims (1)
後の直流成分を含む前置増巾器の出力を、抵抗と、制御
電圧による抵抗可変素子にて分割し、光電気変換をする
光入力パワーにかかわらず該分割点に詔ける直流レベル
が一定となるよう、制御電圧による抵抗可変素子に負饋
還をかけることを特徴とする光受信増巾器の自動利得制
御回路。In the automatic gain control circuit of an optical receiver amplifier, the output of the preamplifier, which includes a DC component after photoelectric conversion, is divided by a resistor and a variable resistance element using a control voltage, and the output of the preamplifier is divided by a resistor and a variable resistance element using a control voltage. An automatic gain control circuit for an optical receiver amplifier, characterized in that negative feedback is applied to a variable resistance element by a control voltage so that the direct current level applied to the division point is constant regardless of input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56110469A JPS5812413A (en) | 1981-07-15 | 1981-07-15 | Automatic gain control circuit for optical receiver and amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56110469A JPS5812413A (en) | 1981-07-15 | 1981-07-15 | Automatic gain control circuit for optical receiver and amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5812413A true JPS5812413A (en) | 1983-01-24 |
Family
ID=14536490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56110469A Pending JPS5812413A (en) | 1981-07-15 | 1981-07-15 | Automatic gain control circuit for optical receiver and amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5812413A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4839611A (en) * | 1988-03-07 | 1989-06-13 | Digital Equipment Corporation | Voltage controlled high-frequency attenuator |
| US4868519A (en) * | 1988-11-02 | 1989-09-19 | Dnic Brokerage Company | Microprocessor-controlled amplifier |
| JPH0496149U (en) * | 1990-10-11 | 1992-08-20 | ||
| WO1999031830A2 (en) * | 1997-12-16 | 1999-06-24 | Nokia Networks Oy | Optical receiver including a transimpedance amplifier and a photodetector |
| EP2819305A1 (en) * | 2013-06-28 | 2014-12-31 | Ams Ag | Amplifier circuit for an opto-electric device, detector arrangement, and method to operate an amplifier circuit for an opto-electric device |
-
1981
- 1981-07-15 JP JP56110469A patent/JPS5812413A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4839611A (en) * | 1988-03-07 | 1989-06-13 | Digital Equipment Corporation | Voltage controlled high-frequency attenuator |
| US4868519A (en) * | 1988-11-02 | 1989-09-19 | Dnic Brokerage Company | Microprocessor-controlled amplifier |
| JPH0496149U (en) * | 1990-10-11 | 1992-08-20 | ||
| WO1999031830A2 (en) * | 1997-12-16 | 1999-06-24 | Nokia Networks Oy | Optical receiver including a transimpedance amplifier and a photodetector |
| EP2819305A1 (en) * | 2013-06-28 | 2014-12-31 | Ams Ag | Amplifier circuit for an opto-electric device, detector arrangement, and method to operate an amplifier circuit for an opto-electric device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU594071B2 (en) | Automatic gain control for hearing aid | |
| US4891605A (en) | Adaptive gain control amplifier | |
| KR890005973A (en) | Frequency response characteristics adjustment method and device | |
| MX9602253A (en) | Method and apparatus for amplifying a signal. | |
| US6792115B1 (en) | Apparatus for generating harmonics in an audio signal | |
| JPS5812413A (en) | Automatic gain control circuit for optical receiver and amplifier | |
| US3991272A (en) | Audio AGC amplifier | |
| JPH0530588A (en) | Automatic sound volume adjusting device | |
| JPS6047783B2 (en) | Automatic gain control method | |
| JPH04334137A (en) | Burst optical receiver | |
| JP3024246B2 (en) | Modulation degree stabilization circuit | |
| US20030159104A1 (en) | Apparatus and method for forward error correction | |
| JPS56131209A (en) | Power amplifying circuit | |
| JPH05145360A (en) | Optical reception circuit and optical transformation circuit | |
| JPS62208724A (en) | Optical receiver | |
| JPS6214760Y2 (en) | ||
| JP2888848B2 (en) | Gain control circuit | |
| JPS6221071Y2 (en) | ||
| EP2602933B1 (en) | Analog signal transfer system, variable compressor and variable expander | |
| JPH01149558A (en) | Light transmitting data receiving circuit | |
| JPS6327465Y2 (en) | ||
| JPH0638514Y2 (en) | Optical receiver | |
| JPH01138806A (en) | Transmission power controller | |
| JPH0382207A (en) | Power amplifying circuit | |
| JPS60226240A (en) | Automatic gain control circuit |