JPH08125619A - Burst light reception circuit - Google Patents
Burst light reception circuitInfo
- Publication number
- JPH08125619A JPH08125619A JP6259996A JP25999694A JPH08125619A JP H08125619 A JPH08125619 A JP H08125619A JP 6259996 A JP6259996 A JP 6259996A JP 25999694 A JP25999694 A JP 25999694A JP H08125619 A JPH08125619 A JP H08125619A
- Authority
- JP
- Japan
- Prior art keywords
- differential amplifier
- burst
- reception circuit
- output
- circuit
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光通信システムに用いる
光伝送モジュールの受信回路に関し、特にバースト信号
の受信を行う受信回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver circuit for an optical transmission module used in an optical communication system, and more particularly to a receiver circuit for receiving burst signals.
【０００２】[0002]
【従来の技術】光通信システムに使用される直流結合受
信回路において直流変動を直流帰還により制御を行う光
受信回路の例が特開平２−５０５０４号公報に記載され
ている。2. Description of the Related Art An example of an optical receiving circuit for controlling DC fluctuations by DC feedback in a DC coupling receiving circuit used in an optical communication system is described in JP-A-2-50504.
【０００３】この方法は、図３に示すように、光素子１
と前置増幅器２と直流帰還回路３により構成される。光
素子１により受光し、前置増幅器２より電流電圧変換、
増幅を行い、直流帰還回路３により帰還をかけ出力端子
の直流電位が一定になるように制御を行っている。This method, as shown in FIG.
And a preamplifier 2 and a DC feedback circuit 3. Light is received by the optical element 1, and current-voltage conversion is performed by the preamplifier 2.
Amplification is performed, feedback is performed by the DC feedback circuit 3, and control is performed so that the DC potential of the output terminal becomes constant.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来技術はバースト信号の場合については触れられてな
く、かつ具体的方策についても述べられていない。However, the above-mentioned prior art does not mention the case of the burst signal, nor does it describe a concrete measure.
【０００５】光素子と前置増幅器間が直流結合である場
合、温度変動により前置増幅器に使用しているトランジ
スタのベース・エミッタ電位などが変動し、前置増幅器
や差動増幅器の出力が変動する。When the optical element and the preamplifier are DC-coupled, the base-emitter potential of the transistor used in the preamplifier fluctuates due to temperature fluctuation, and the output of the preamplifier or differential amplifier fluctuates. To do.
【０００６】従って、本発明の目的はバースト信号にお
いてもこのような前置増幅器や差動増幅器の出力変動を
無くし、差動増幅器出力の直流電位を安定にする事であ
る。Therefore, an object of the present invention is to eliminate such output fluctuations of the preamplifier and the differential amplifier even in a burst signal and stabilize the DC potential of the output of the differential amplifier.
【０００７】[0007]
【課題を解決するための手段】上記目的は、バースト信
号のローレベル電位を抽出し増幅器出力変動を差動増幅
器のリファレンス入力に返し、信号側入力変動を相殺さ
せることにより達成される。The above object is achieved by extracting the low level potential of the burst signal, returning the amplifier output fluctuation to the reference input of the differential amplifier, and canceling the signal side input fluctuation.
【０００８】[0008]
【作用】光素子と前置増幅器が直結接続されている場
合、前置増幅器に使用しているトランジスタのベース・
エミッタ間電位などの変動により前置増幅器出力が直流
変動する。したがって、後段に接続されている差動増幅
器出力も変動する。[Function] When the optical element and the preamplifier are directly connected, the base of the transistor used in the preamplifier
The output of the preamplifier fluctuates due to fluctuations in the potential between the emitters. Therefore, the output of the differential amplifier connected to the subsequent stage also changes.
【０００９】この差動増幅器出力から直流成分のみを取
り出し差動増幅器のリファレンス入力に帰還させ、信号
入力側の変動を相殺することにより差動増幅器出力を安
定にする事が出来る。通常、このような場合はピーク検
出や積分による直流帰還が用いられるが、バースト信号
では信号のまったく無い区間が存在するためこれらの方
法では直流電位の抽出は出来ない。ゆえに、バースト信
号のローレベル電位を検出し差動増幅器のリファレンス
入力に帰還させ信号入力の変動を相殺する。It is possible to stabilize the output of the differential amplifier by extracting only the DC component from the output of the differential amplifier and feeding it back to the reference input of the differential amplifier to cancel the fluctuation on the signal input side. Usually, in such a case, DC detection by peak detection or integration is used, but since there is a signal-free section in the burst signal, the DC potential cannot be extracted by these methods. Therefore, the low level potential of the burst signal is detected and fed back to the reference input of the differential amplifier to cancel the fluctuation of the signal input.
【００１０】[0010]
【実施例】以下、本発明の実施例を図１、図２により説
明する。図１は本発明の一実施例に係わるバースト光受
信回路であり、図２はその動作を示す各部動作波形であ
る。実施例に係るバースト光受信回路は、図１に示すよ
うに光素子１と前置増幅器２と差動増幅器４とローレベ
ル検出回路５と積分器６により構成される。Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows a burst light receiving circuit according to an embodiment of the present invention, and FIG. 2 shows operation waveforms of respective parts showing its operation. As shown in FIG. 1, the burst light receiving circuit according to the embodiment includes an optical element 1, a preamplifier 2, a differential amplifier 4, a low level detection circuit 5 and an integrator 6.
【００１１】光素子１に光信号が入力されると前置増幅
器２により電流電圧変換され、差動増幅器４に入力され
る。この時、受信回路周囲の温度変動により前置増幅器
２に用いているトランジスタＱ２、Ｑ３のベース・エミ
ッタ間電位が変動するため前置増幅器２の出力が変動す
る。したがって、差動増幅器４の出力も変動する。この
差動増幅器出力の信号波形（図２Ａ）をローレベル検出
回路５のＱ５、Ｒ１５、Ｒ１６によりレベルシフトさせ
（図２Ｂ）、Ｑ４、Ｃ２、Ｒ１４により信号波形のロー
レベル電位の検出を行う（図２Ｃ）。次に積分器６によ
り平滑化、増幅して直流成分を抽出する（図２Ｄ）。こ
の抽出した直流成分を差動増幅器４のリファレンス入力
に帰還させ、信号入力側の変動を相殺する。これらのこ
とにより直流帰還がかかり差動増幅器４の直流出力電圧
を安定にさせる。When an optical signal is input to the optical element 1, the preamplifier 2 converts the current into a voltage and inputs the signal to the differential amplifier 4. At this time, the base-emitter potential of the transistors Q2 and Q3 used in the preamplifier 2 fluctuates due to temperature fluctuations around the receiving circuit, so that the output of the preamplifier 2 fluctuates. Therefore, the output of the differential amplifier 4 also changes. The signal waveform of this differential amplifier output (FIG. 2A) is level-shifted by Q5, R15, and R16 of the low level detection circuit 5 (FIG. 2B), and the low level potential of the signal waveform is detected by Q4, C2, and R14 ( FIG. 2C). Next, the integrator 6 smoothes and amplifies and extracts a DC component (FIG. 2D). The extracted DC component is fed back to the reference input of the differential amplifier 4 to cancel the fluctuation on the signal input side. As a result, DC feedback is applied and the DC output voltage of the differential amplifier 4 is stabilized.
【００１２】図１では光素子１のアノード端子を接地し
ているが、アノード端子を負電源に接続しても良く、逆
にカソード端子を正電源に接続しアノード端子を前置増
幅器２に接続して差動増幅器４を反転出力にしても良い
ことは明らかである。また、前置増幅器２、ローレベル
検出回路５、および積分器６は図１の回路以外でも構成
出来ることは言うまでもない。さらに、バースト信号以
外の受信回路にも適用出来ることは明らかである。Although the anode terminal of the optical element 1 is grounded in FIG. 1, the anode terminal may be connected to the negative power source, and conversely, the cathode terminal may be connected to the positive power source and the anode terminal may be connected to the preamplifier 2. It is obvious that the differential amplifier 4 may be inverted output. Further, it goes without saying that the preamplifier 2, the low level detection circuit 5, and the integrator 6 can be constituted by circuits other than the circuit shown in FIG. Further, it is obvious that the present invention can be applied to receiving circuits other than burst signals.
【００１３】[0013]
【発明の効果】本発明によれば、バースト信号でも温度
変動等による直流変動のない安定した出力を得ることが
出来る。According to the present invention, it is possible to obtain a stable output even with a burst signal without direct current fluctuation due to temperature fluctuation or the like.
【図１】本発明の一実施例を示す回路構成図である。FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.
【図２】本発明の一実施例の動作波形を示す図である。FIG. 2 is a diagram showing operation waveforms according to an embodiment of the present invention.
【図３】従来技術による受信回路構成図である。FIG. 3 is a configuration diagram of a receiving circuit according to a conventional technique.
１…発光素子、 ２…駆動回路、 ３…前置増幅器、 ４…直流帰還回路、 ５…ローレベル検出回路、 ６…積分器、 Rn…抵抗、 VR…可変抵抗器、 Cn…コンデンサ、 Qn…トランジスタ、 +V…正電源、 -V…負電源。 1 ... Light emitting element, 2 ... Drive circuit, 3 ... Preamplifier, 4 ... DC feedback circuit, 5 ... Low level detection circuit, 6 ... Integrator, Rn ... Resistor, VR ... Variable resistor, Cn ... Capacitor, Qn ... Transistor, + V ... Positive power supply, -V ... Negative power supply.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 10/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location H04B 10/06
Claims (2)
直流結合にて受信信号を出力するバースト光受信回路に
おいて、差動増幅器出力にローレベル検出回路と積分器
を備え、積分器出力を差動増幅器のリファレンス入力に
帰還させることを特徴とするバースト光受信回路。1. A burst light receiving circuit for outputting a reception signal by direct-current coupling a light receiving element, a preamplifier and a differential amplifier, wherein a differential amplifier output is provided with a low level detection circuit and an integrator, and an integrator output is A burst optical receiver circuit characterized by being fed back to the reference input of a differential amplifier.
子を使用したことを特徴とするバースト光受信回路。2. A burst light receiving circuit according to claim 1, wherein a light emitting element is used as a light receiving element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6259996A JPH08125619A (en) | 1994-10-25 | 1994-10-25 | Burst light reception circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6259996A JPH08125619A (en) | 1994-10-25 | 1994-10-25 | Burst light reception circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08125619A true JPH08125619A (en) | 1996-05-17 |
Family
ID=17341851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6259996A Pending JPH08125619A (en) | 1994-10-25 | 1994-10-25 | Burst light reception circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08125619A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138464B2 (en) | 2008-07-24 | 2012-03-20 | Kabushiki Kaisha Toshiba | Optical receiving circuit |
| WO2020250846A1 (en) * | 2019-06-13 | 2020-12-17 | 住友電気工業株式会社 | Optical reception device, station-side device, pon system, preamplifier, optical reception method, and method for suppressing output inversion of integrator |
-
1994
- 1994-10-25 JP JP6259996A patent/JPH08125619A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138464B2 (en) | 2008-07-24 | 2012-03-20 | Kabushiki Kaisha Toshiba | Optical receiving circuit |
| WO2020250846A1 (en) * | 2019-06-13 | 2020-12-17 | 住友電気工業株式会社 | Optical reception device, station-side device, pon system, preamplifier, optical reception method, and method for suppressing output inversion of integrator |
| US11942998B2 (en) | 2019-06-13 | 2024-03-26 | Sumitomo Electric Industries, Ltd. | Optical reception device, station-side device, PON system, preamplifier, optical reception method, and method for suppressing output inversion of integrator |
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