JP2536178B2 - Optical transceiver - Google Patents
Optical transceiverInfo
- Publication number
- JP2536178B2 JP2536178B2 JP1232061A JP23206189A JP2536178B2 JP 2536178 B2 JP2536178 B2 JP 2536178B2 JP 1232061 A JP1232061 A JP 1232061A JP 23206189 A JP23206189 A JP 23206189A JP 2536178 B2 JP2536178 B2 JP 2536178B2
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- optical
- voltage signal
- signal
- pulse width
- 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 - Lifetime
Links
Landscapes
- Optical Communication System (AREA)
- Dc Digital Transmission (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電気信号の強弱を光信号の強弱に変換して
光ファイバケーブルを通じて光通信を行う光通信機器の
光送受信器に関するものである。Description: TECHNICAL FIELD The present invention relates to an optical transmitter / receiver of an optical communication device that converts the strength of an electric signal into the strength of an optical signal to perform optical communication through an optical fiber cable.
一般に光ファイバケーブルを伝送路として用いる光送
受信器において,電気パルス信号を直接光信号に変換し
ファイバケーブルを伝送させた場合,コネクタ等の接続
部分による光の減衰及びファイバケーブルを伝播中の減
衰や拡散により光レベルの低下とパルスになまりが生じ
る。Generally, in an optical transmitter / receiver that uses an optical fiber cable as a transmission path, when an electric pulse signal is directly converted into an optical signal and transmitted through the fiber cable, attenuation of light by a connecting portion such as a connector and attenuation during propagation of the fiber cable Diffusion causes a drop in light level and pulse rounding.
受信器としては光受信レベルの減衰及びなまりに対し
て送信側の入力パルス電気信号を忠実に再生する(即ち
送信パルス幅と同幅のパルスを再生する)機能が不可欠
であり,この信号からクロックを再生する場合,特にパ
ルス幅歪が小さいことが重要である。The receiver must have the function of faithfully reproducing the input pulse electric signal on the transmission side (that is, reproducing the pulse having the same width as the transmission pulse width) against the attenuation and rounding of the optical reception level. When reproducing, it is especially important that the pulse width distortion is small.
パルス幅歪が小さく,しかも受信レベルの変動に対応
できる回路としてAGC(Automatic Gain Control)回路
とATC(Automatic Threshold Contnol)回路を備えた自
動識別器が普及している。An automatic discriminator equipped with an AGC (Automatic Gain Control) circuit and an ATC (Automatic Threshold Contnol) circuit has become widespread as a circuit that has a small pulse width distortion and can cope with fluctuations in the reception level.
AGC回路はバースト信号である場合はデータ停止部分
でAGC機能が停止してしまい正常動作を維持できない。When the AGC circuit is a burst signal, the AGC function stops at the data stop part and normal operation cannot be maintained.
ATC回路を備えた光受信器を第4図に示す。 An optical receiver equipped with an ATC circuit is shown in FIG.
第4図において(1)は光パルスを電流信号に変換す
る受光ダイオード,(2)は受光ダイオードで変換され
た電流信号を増幅し電圧信号に変換する増幅器,(3)
は増幅器(2)の増幅度を定める帰還用の抵抗器,
(4)〜(9)は抵抗器,(10)はATC回路の応答速度
を定めるキャパシタ,(11)は正入力(+)と負入力
(−)の2入力の大きさの大小により電圧信号をパルス
の有無に識別再生する識別器,第5図は第4図に示した
光受信器の識別再生動作のパルス幅出力動作について表
わした図である。In FIG. 4, (1) is a light receiving diode for converting an optical pulse into a current signal, (2) is an amplifier for amplifying a current signal converted by the light receiving diode and converting it into a voltage signal, (3)
Is a feedback resistor that determines the amplification of the amplifier (2),
(4) to (9) are resistors, (10) is a capacitor that determines the response speed of the ATC circuit, and (11) is a voltage signal depending on the size of the two inputs of positive input (+) and negative input (-). FIG. 5 is a diagram showing a pulse width output operation of the identification reproduction operation of the optical receiver shown in FIG.
VC1は前記識別器(11)の正入力(+)に印加される
受信電圧信号,VC2は前記識別器(11)の負入力(−)に
印加される受信電圧信号,VC3は前記識別器(11)で識別
されたパルス電圧信号を示す。VC1 is a received voltage signal applied to the positive input (+) of the discriminator (11), VC2 is a received voltage signal applied to the negative input (-) of the discriminator (11), and VC3 is the discriminator ( The pulse voltage signal identified in 11) is shown.
光ファイバを伝送した光パルスは受光ダイオード
(1)によって光パルスのレベルに対応した電流に変換
され,増幅器(2)とその入出力に接続された抵抗器
(3)により次式に示す電圧信号(Vo)に変換される。The optical pulse transmitted through the optical fiber is converted into a current corresponding to the level of the optical pulse by the light receiving diode (1), and the voltage signal shown by the following equation is obtained by the amplifier (2) and the resistor (3) connected to its input and output. Converted to (Vo).
Vo=S.P.R(V) ……(1) Vo(受信電圧信号),S(発光ダイオードの光電気変換感
度A/W) P(受送レベルW),R(抵抗器(3)の抵抗値Ω) 受信電圧信号Voは抵抗器(5)を通して識別器(11の
正入力(+)にVC1として印加される。Vo = SPR (V) (1) Vo (received voltage signal), S (photoelectric conversion sensitivity of light emitting diode A / W) P (received level W), R (resistance value Ω of resistor (3)) The received voltage signal Vo is applied as VC1 to the positive input (+) of the discriminator (11) through the resistor (5).
同時に抵抗器(6)を通じて識別器(11)の負入力
(−)にもVC2として印加される。At the same time, VC2 is applied to the negative input (-) of the discriminator (11) through the resistor (6).
識別器(11)の負入力(−)には直流電圧の+5Vが抵
抗器(8),(9)で分圧した直流電圧となり抵抗器
(7)を通じて印加されている。To the negative input (-) of the discriminator (11), + 5V of the DC voltage becomes a DC voltage divided by the resistors (8) and (9) and is applied through the resistor (7).
受信電圧信号(Vo)が印加される前は前記直流電圧が
識別器(11)の負入力(−)に印加されているため識別
器出力信号VC3はOVに保持されている。Since the DC voltage is applied to the negative input (-) of the discriminator (11) before the reception voltage signal (Vo) is applied, the discriminator output signal VC3 is held at OV.
送信器で送信された光パルスがデューテイ50%の正規
パルス信号であっても光ファイバ伝送中に減衰となまり
が生じ受信器入力光パルスは第5図のようになまった波
形となる。これが前記光電変換した受信電圧信号Voにな
る。Even if the optical pulse transmitted by the transmitter is a normal pulse signal with a duty of 50%, attenuation and rounding occurs during optical fiber transmission, and the optical pulse input to the receiver has a waveform as shown in FIG. This becomes the photoelectrically converted reception voltage signal Vo.
受信電圧信号VC2はキャパシタ(10)と抵抗器(6)
で定まる積分動作により受信電圧信号VC1より遅れて立
上ると共にそのレベルはVC1に追従する。The received voltage signal VC2 is a capacitor (10) and a resistor (6)
It rises with a delay from the received voltage signal VC1 by the integration operation determined by and its level follows VC1.
識別器(11)は正入力(+)VC1が負入力(−)VC2よ
り大で出力信号VC3をhigh(1)にする。このようにし
て識別器(11)は電気パルス信号の小さなレベル変動に
対し追従しながら識別及び再生する動作(ATC)を行な
う。The discriminator (11) sets the output signal VC3 to high (1) when the positive input (+) VC1 is larger than the negative input (−) VC2. In this way, the discriminator (11) performs an operation (ATC) of discriminating and reproducing while following a small level fluctuation of the electric pulse signal.
光レベルの変動と光波形のなまりが大きい場合第5図
に示すように受信電圧信号Vc1はVc2より大になるのが遅
れるため出力パルス電圧信号Vc3はパルス幅歪の大きい
(パルス幅の狭い)電圧出力となる。When the fluctuation of the optical level and the rounding of the optical waveform are large, the output pulse voltage signal Vc3 has large pulse width distortion (narrow pulse width) because the reception voltage signal Vc1 becomes larger than Vc2 as shown in FIG. Voltage output.
従来の光受信器の識別器はThresholdの追従作用によ
りある程度パルス幅歪を小さく押えられるが,光レベル
の変動と光波形のなまりが大きい場合Thresholdの追従
範囲外となりパルス歪が大きくなる。光受信器が出力す
るパルス電圧信号のパルス幅歪を小さくし,送信の電気
パルス信号とほぼ同じパルス幅を持つパルス電圧信号を
識別再生できなければ正規のクロックを抽出できない課
題が生じATC回路のThreshold追従作用だけでは課題を解
決することができない問題点があった。The discriminator of the conventional optical receiver can suppress the pulse width distortion to some extent by the tracking effect of the threshold, but when the fluctuation of the optical level and the rounding of the optical waveform are large, it goes out of the tracking range of the threshold and the pulse distortion becomes large. If the pulse width distortion of the pulse voltage signal output by the optical receiver is reduced and the pulse voltage signal having almost the same pulse width as the transmitted electric pulse signal cannot be identified and reproduced, the problem that the regular clock cannot be extracted occurs. There was a problem that the problem could not be solved only by the threshold tracking action.
この発明は上記のような課題を解決するためになされ
たもので受信電気パルス幅歪を最小とするために歪に対
応して送信光パルス幅を制御する光受信器を得ることを
目的とする。The present invention has been made to solve the above problems, and an object thereof is to obtain an optical receiver that controls the transmission optical pulse width corresponding to the distortion in order to minimize the reception electric pulse width distortion. .
この発明に係る光送受信器の光送信部は入力パルス電
圧信号のパルス幅を拡散できるパルス幅制御回路を,光
受信部は受信電圧信号からパルス電圧信号を再生出力す
る識別器と,識別器からのパルス電圧信号と入力パルス
電圧信号の双方のパルス幅を比較するパルス幅比較器
と,パルス幅の差の符号を判別するパルス幅差別回路を
備えたものである。The optical transmitter of the optical transmitter / receiver according to the present invention comprises a pulse width control circuit capable of spreading the pulse width of the input pulse voltage signal, and the optical receiver comprises a discriminator for reproducing and outputting a pulse voltage signal from the received voltage signal, and a discriminator. The pulse width comparator for comparing the pulse widths of both the pulse voltage signal and the input pulse voltage signal, and the pulse width discriminating circuit for discriminating the sign of the difference between the pulse widths.
この発明における光送受信器は受信パルス電圧信号の
パルス幅と入力パルス電圧信号のパルス幅を比較し受信
パルス電圧信号のパルス幅が狭い場合,負(−)符号を
出力,次に負(−)符号を受けパルス幅制御回路により
入力パルス電圧信号のパルス幅を拡大,この拡大信号を
受信再生し受信パルス電圧信号を再度入力パルス電圧信
号のパルス幅と比較し一致するまで入力パルス電圧信号
のパルス幅を拡大又は縮小させる作用を行なうものであ
る。The optical transceiver according to the present invention compares the pulse width of the received pulse voltage signal with the pulse width of the input pulse voltage signal, outputs a negative (-) sign when the pulse width of the received pulse voltage signal is narrow, and then outputs a negative (-) sign. Receiving the code, the pulse width of the input pulse voltage signal is expanded by the pulse width control circuit, this expanded signal is received and reproduced, and the received pulse voltage signal is compared again with the pulse width of the input pulse voltage signal. The function of expanding or contracting the width is performed.
以下この発明の実施例を第1,2及び3図で説明する。 An embodiment of the present invention will be described below with reference to FIGS.
第1図において,(12)は入力パルス電圧信号のパル
ス幅を拡大又は縮小することができるパルス幅調整回
路,(13)は発光ダイオードを前記パルス電圧信号に対
応して,オン又はオフさせるドライバ回路,(14)は前
記ドライバ回路(13)により光をオン又はオフさせる発
光ダイオード,(15)は前記発光ダイオードで発した光
を光受信器まで伝送する光ファイバケーブルである。In FIG. 1, (12) is a pulse width adjusting circuit capable of enlarging or reducing the pulse width of an input pulse voltage signal, and (13) is a driver for turning on or off a light emitting diode corresponding to the pulse voltage signal. A circuit, (14) is a light emitting diode for turning on or off light by the driver circuit (13), and (15) is an optical fiber cable for transmitting the light emitted from the light emitting diode to an optical receiver.
光送信器と光受信器をファイバケーブル(15)を介し
て設置した後に入力パルス電圧信号を送信器に加える
と,パルス幅調整回路(12)は当初パルス幅を調整しな
いでそのままのパルス幅を維持してドライバ回路(13)
に信号を送る。発光ダイオード(14)で変換された送信
光パルス信号は光ファイバケーブル(15)を介して受信
器に到着した時第3図の受信側光パルス信号の波形に示
すようにコネクタ等の接続部分による光の減衰及びファ
イバケーブルを伝播中の減衰や拡散により光レベルの低
下とパルスになまりが生じたものになる。光パルス信号
は受信器の発光ダイオード(1)によって光パルスの有
無に対応した電流に変換され,増幅器(2)とその入出
力に接続された抵抗器(3)により前記(1)式で示す
受信電圧信号(Vo)に変換される。When the input pulse voltage signal is applied to the transmitter after the optical transmitter and the optical receiver are installed via the fiber cable (15), the pulse width adjustment circuit (12) initially adjusts the pulse width without adjusting the pulse width. Driver circuits to keep (13)
Send a signal to When the transmission light pulse signal converted by the light emitting diode (14) arrives at the receiver through the optical fiber cable (15), it is caused by the connecting portion such as a connector as shown in the waveform of the reception side light pulse signal in FIG. Attenuation of light and attenuation and diffusion during propagation through the fiber cable result in a decrease in light level and rounding of pulses. The light pulse signal is converted into a current corresponding to the presence or absence of a light pulse by the light emitting diode (1) of the receiver, and is expressed by the above equation (1) by the amplifier (2) and the resistor (3) connected to its input and output. Converted to received voltage signal (Vo).
受信電圧信号(Vo)は抵抗器(5)を通じて識別器
(11)の正入力(+)にVc1として印加される。同時に
抵抗器(6)を通じて識別器(11)の負入力(−)にも
Vc2として印加される。識別器(11)の負入力(−)に
は直流電圧の+5Vが抵抗器(8),(9)で分圧した直
流電圧となり抵抗器(7)を通じて印加されている。受
信電圧信号(Vo)が印加される前は前記直流電圧が識別
器(11)の負入力(−)に印加されているため識別器出
力信号Vc3はOVに保持されている。The received voltage signal (Vo) is applied as Vc1 to the positive input (+) of the discriminator (11) through the resistor (5). At the same time, through the resistor (6) to the negative input (-) of the discriminator (11)
Applied as Vc2. To the negative input (-) of the discriminator (11), + 5V of the DC voltage becomes a DC voltage divided by the resistors (8) and (9) and is applied through the resistor (7). Since the DC voltage is applied to the negative input (-) of the discriminator (11) before the reception voltage signal (Vo) is applied, the discriminator output signal Vc3 is held at OV.
受信電圧信号Vc2はキャパシタ(10)と抵抗器(6)
で定まる積分動作により受信電圧信号Vc1より遅れて立
上ると共にそのレベルはVc1に追従する。The received voltage signal Vc2 is a capacitor (10) and a resistor (6)
It rises with a delay from the received voltage signal Vc1 by the integration operation determined by and its level follows Vc1.
これを第3図の識別器入力電圧で示す。第3図に示す
ように光レベル低下となまりが生じた場合,識別器出力
パルス電圧信号Vc3はパルス幅の狭い出力信号となり後
段に続くクロック抽出回路でクロックが精度良く抽出で
きない不具合となる。This is shown by the discriminator input voltage in FIG. As shown in FIG. 3, when the optical level is lowered and rounded, the discriminator output pulse voltage signal Vc3 becomes an output signal with a narrow pulse width, which causes a problem that the clock cannot be accurately extracted by the clock extraction circuit that follows.
この不具合を無くするため第3図に示すように予め出
力パルス電圧信号Vc3のパルス幅を測定し,パルス幅の
狭くなった量に対応して送信器のパルス幅調整回路(1
2)で入力パルス電圧信号のパルス幅を広くとるもので
ある。In order to eliminate this problem, the pulse width of the output pulse voltage signal Vc3 is measured beforehand as shown in FIG. 3, and the pulse width adjustment circuit (1
In 2), the pulse width of the input pulse voltage signal is widened.
また第2図に示すものは自局で送信した光パルス信号
が自局の受信部に戻ってくるものであり(16)は入力パ
ルス電圧信号を拡大又は縮小できるパルス幅制御回路,
(17)は多数の光ファイバケーブル(15)を介して送受
信器と接続され送信光パルス信号を等しく分配する光ス
ターカプラ,(18)は受信部の識別器(11)から識別再
生されたパルス電圧信号と入力パルス電圧信号のパルス
幅の大小を比較するパルス幅比較器(18),(19)はパ
ルス幅の大小により符号を出力するものでパルス電圧信
号のパルス幅が入力パルス電圧信号のパルス幅より小の
時は負(−)を大の時は正(+)をパルス幅制御回路に
出力するパルス幅差判別回路である。The one shown in Fig. 2 shows that the optical pulse signal transmitted by the local station returns to the receiving section of the local station (16) is a pulse width control circuit that can expand or contract the input pulse voltage signal,
(17) is an optical star coupler that is connected to a transmitter / receiver via a number of optical fiber cables (15) and equally distributes the transmitted optical pulse signal, and (18) is a pulse that is discriminated and regenerated from the discriminator (11) in the receiving section. The pulse width comparators (18) and (19) that compare the magnitude of the pulse width of the voltage signal and the input pulse voltage signal output the sign depending on the magnitude of the pulse width. The pulse width difference determination circuit outputs a negative (-) when the pulse width is smaller than the pulse width and a positive (+) when the pulse width is larger than the pulse width.
光受信部の識別器(11)で識別再生されたパルス電圧
信号と入力パルス電圧信号のパルス幅をパルス幅比較器
(18)で比較しパルス電圧信号が入力パルス電圧信号よ
りパルス幅が狭い時はパルス幅差判別回路(19)から負
(−)の符号がパルス幅制御回路(16)に出力される。
パルス幅制御回路(16)は負(−)の符号を受けて入力
パルス電圧信号のパルス幅を拡大する制御を行なう。When the pulse width of the pulse voltage signal narrower than that of the input pulse voltage signal is compared by comparing the pulse width of the pulse voltage signal regenerated by the discriminator (11) of the optical receiver and the input pulse voltage signal with the pulse width comparator (18). Is output from the pulse width difference determination circuit (19) to the pulse width control circuit (16) with a negative (-) sign.
The pulse width control circuit (16) receives a negative (-) sign and performs control for expanding the pulse width of the input pulse voltage signal.
この制御を繰返し行ない入力パルス電圧信号と受信パ
ルス電圧信号のパルス幅を等しくするものである。This control is repeated to equalize the pulse widths of the input pulse voltage signal and the received pulse voltage signal.
以上のようにこの発明によれば受信器で識別再生した
パルス電圧信号のパルス幅を計測器による目視判定又は
自動判定し送信器のパルス幅を拡大又は縮小することに
より入力パルス電圧信号のパルス幅とほぼ等しい受信パ
ルス電圧信号を得ることができるようにしたもので,受
信パルス電圧信号からクロックを容易に抽出することが
可能となり精度良い光送受信器を提供するものである。As described above, according to the present invention, the pulse width of the pulse voltage signal discriminated and reproduced by the receiver is visually judged or automatically judged by the measuring device, and the pulse width of the transmitter is expanded or reduced to increase or decrease the pulse width of the input pulse voltage signal. It is possible to obtain a received pulse voltage signal that is almost equal to, and it is possible to easily extract a clock from the received pulse voltage signal, and to provide an accurate optical transceiver.
第1図,第2図はこの発明の一実施例の光送受信器を示
す図,第3図はこの発明の光送受信器の波形を示す図,
第4図は従来の一実施例の光送受信器を示す図,第5図
は従来の光送受信器の出力波形を示す図である。 (1)は受光ダイオード,(2)は増幅器,(3)〜
(9)は抵抗器,(10)はキャパシタ,(11)は識別
器,(12)はパルス幅調整回路,(13)はドライバ回
路,(14)は発光ダイオード,(15)は光ファイバケー
ブル,(16)はパルス幅制御回路,(17)はスターカプ
ラ,(18)はパルス幅比較器,(19)はパルス幅差判別
回路である。 なお,図中同一符号は同一又は相当部分を示す。1 and 2 are diagrams showing an optical transceiver according to an embodiment of the present invention, and FIG. 3 is a diagram showing waveforms of the optical transceiver of the present invention.
FIG. 4 is a diagram showing an optical transmitter / receiver of a conventional example, and FIG. 5 is a diagram showing output waveforms of the conventional optical transmitter / receiver. (1) is a light receiving diode, (2) is an amplifier, (3)-
(9) is a resistor, (10) is a capacitor, (11) is a discriminator, (12) is a pulse width adjusting circuit, (13) is a driver circuit, (14) is a light emitting diode, and (15) is an optical fiber cable. , (16) is a pulse width control circuit, (17) is a star coupler, (18) is a pulse width comparator, and (19) is a pulse width difference determination circuit. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
パルス信号に変換する光送信部と、この光パルス信号を
伝送する光ファイバと、この光ファイバと接続され光を
複数に分配する光スターカプラと、前記光パルス信号を
パルス電圧信号に復調して出力する受信部とを持ち前記
スターカプラを中心にして光ファイバでスター状に接続
された複数の光送受信器において、前記入力パルス電圧
信号のパルス幅を拡張できるパルス幅制御回路と、この
パルス信号を光パルスに変換する発光素子と、この発光
素子を前記パルス信号に対応してドライブするドライブ
回路を備えた光送信部と、前記光スターカプラで分配さ
れた光パルスを電流信号に変換する受光素子と、この電
流信号を増幅する増幅器と、この増幅器より出力される
電圧信号からパルス電圧信号を再生出力する識別器と、
この識別器からのパルス電圧信号と入力パルス電圧信号
のパルス幅を比較するパルス幅比較器と、この双方のパ
ルス幅の差の符号を前記パルス幅制御回路に出力するパ
ルス幅差判別回路を備えた光受信部から成ることを特徴
とする光送受信器。1. An optical transmitter for converting an input pulse voltage signal into an optical pulse signal by optical intensity modulation, an optical fiber for transmitting the optical pulse signal, and an optical star connected to the optical fiber for distributing light to a plurality of optical fibers. In a plurality of optical transceivers having a coupler and a receiver for demodulating the optical pulse signal into a pulse voltage signal and outputting the pulse voltage signal, the input pulse voltage signal is a plurality of optical transceivers connected in a star shape around the star coupler. A pulse width control circuit capable of expanding the pulse width of the light emitting element, a light emitting element for converting the pulse signal into an optical pulse, an optical transmitting section including a drive circuit for driving the light emitting element in response to the pulse signal, A light receiving element that converts the optical pulse distributed by the star coupler into a current signal, an amplifier that amplifies this current signal, and a pulse signal from the voltage signal output from this amplifier. A discriminator to reproduce and output a voltage signal,
A pulse width comparator that compares the pulse widths of the pulse voltage signal from the discriminator and the input pulse voltage signal, and a pulse width difference determination circuit that outputs the sign of the difference between the pulse widths of the two to the pulse width control circuit An optical transmitter / receiver comprising an optical receiver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1232061A JP2536178B2 (en) | 1989-09-07 | 1989-09-07 | Optical transceiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1232061A JP2536178B2 (en) | 1989-09-07 | 1989-09-07 | Optical transceiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0396023A JPH0396023A (en) | 1991-04-22 |
JP2536178B2 true JP2536178B2 (en) | 1996-09-18 |
Family
ID=16933368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1232061A Expired - Lifetime JP2536178B2 (en) | 1989-09-07 | 1989-09-07 | Optical transceiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2536178B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000027055A1 (en) * | 1998-10-30 | 2000-05-11 | Fujitsu Limited | System suitable for monitoring control in optical transmission |
JP7211260B2 (en) * | 2019-05-17 | 2023-01-24 | 株式会社デンソー | Communication device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61234150A (en) * | 1985-04-09 | 1986-10-18 | Mitsubishi Electric Corp | Optical transmitter-receiver |
JPH01204537A (en) * | 1988-02-10 | 1989-08-17 | Sumitomo Electric Ind Ltd | Semiconductor laser driving circuit |
-
1989
- 1989-09-07 JP JP1232061A patent/JP2536178B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0396023A (en) | 1991-04-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20020027689A1 (en) | Fiber optic transceiver employing front end level control | |
JPS59216339A (en) | Light receiver and light transmission system | |
US7123098B2 (en) | Transimpedance amplifier with differential peak detector | |
US5838731A (en) | Burst-mode digital receiver | |
US5337042A (en) | Vehicle communications network transceiver, transmitter circuit therefor | |
US5790295A (en) | Gated integrator preamplifier for infrared data networks | |
GB2100085A (en) | Pulse regenerator | |
KR100445910B1 (en) | Optical signal receiving apparatus and method having suitable receiving performance in spite of change of intensity of the optical signal | |
US6882944B2 (en) | Threshold setting apparatus for adjustably setting a threshold for use in identifying serial data from a baseband signal | |
US5729373A (en) | Reproducing circuit of monitor signal | |
JPH10163960A (en) | Optical burst transmission/reception circuit | |
JP2536178B2 (en) | Optical transceiver | |
US4543664A (en) | Direct current coupled data transmission | |
JPH01286655A (en) | Light receiving circuit | |
JP2713126B2 (en) | Optical receiver | |
US6034802A (en) | Wireless communications systems with self threshold setting | |
US5302860A (en) | Circuit arrangement for automatic gain control | |
CN113972954A (en) | Optical fiber transceiver, pulse signal transceiving system and method | |
JP2508980B2 (en) | Optical transmitter circuit | |
JPH01259656A (en) | Optical receiver | |
JPH0846568A (en) | Optical reception device | |
JPH02137550A (en) | Reception system optimizing system | |
JPS6221419B2 (en) | ||
JPH04334137A (en) | Burst optical receiver | |
JPS628980B2 (en) |