JPH05227104A - Light receiver - Google Patents
Light receiverInfo
- Publication number
- JPH05227104A JPH05227104A JP4026303A JP2630392A JPH05227104A JP H05227104 A JPH05227104 A JP H05227104A JP 4026303 A JP4026303 A JP 4026303A JP 2630392 A JP2630392 A JP 2630392A JP H05227104 A JPH05227104 A JP H05227104A
- Authority
- JP
- Japan
- Prior art keywords
- output
- preamplifier
- detector
- offset
- value detector
- 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
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010791 quenching Methods 0.000 abstract 2
- 230000000171 quenching effect Effects 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 description 12
- 230000035945 sensitivity Effects 0.000 description 9
- 230000008033 biological extinction Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 101100484930 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) VPS41 gene Proteins 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Dc Digital Transmission (AREA)
- Optical Communication System (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光受信装置に関し、特
に光通信システムにおける高速デジタル光通信に用いら
れる光受信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical receiver, and more particularly to an optical receiver used for high speed digital optical communication in an optical communication system.
【０００２】[0002]
【従来の技術】近年、例えばＥｒ添加ファイバ光増幅器
の様な光増幅器を多段接続した長距離光伝送実験が行わ
れている。その一例を図５に示す（枝川らによる、”１
０Ｇｂ／ｓ、１５００ｋｍ トランスミッション イク
スペリメント ユージング ２２ Ｅｒ−ド−プト フ
ァイバ アンプリファイア リピータース”、ＥＣＯ
Ｃ’９１、ポストデットラインペーパ ｐ．４６［Ｅｄ
ａｇａｗａ，ｅｔ．ａｌ．，”１０Ｇｂ／ｓ，１５００
ｋｍ Ｔｒａｎｓｍｉｓｓｉｏｎ Ｅｘｅｒｉｍｅｎｔ
ｕｓｉｎｇ ２２ Ｅｒ−Ｄｏｐｅｄ Ｆｉｂｅｒ
ＡｍｐｌｉｆｉｅｒＲｅｐｅａｔｅｒ”，ＥＣＯＣ’９
１ Ｐｏｓｔ−ｄｅａｓｄｌｉｎｅ ｐａｐｅｒ］）。
本実験は、Ｅｒ添加ファイバ増幅器を２３段含んだ光フ
ァイバを用いて伝送実験を行ったものであり、伝送距離
１５００ｋｍを実現している。また、光受信器には雑音
光を除去する通過帯域１ｎｍの光フィルタを用いてい
る。2. Description of the Related Art In recent years, long-distance optical transmission experiments in which optical amplifiers such as Er-doped fiber optical amplifiers are connected in multiple stages have been conducted. An example of this is shown in Fig. 5 (Edagawa et al., "1.
0Gb / s, 1500km Transmission Experiments Eusings 22 Er-Dope Fiber Amplifier Repeaters ", ECO
C'91, post-deadline paper p. 46 [Ed
agawa, et. al. , "10 Gb / s, 1500
km Transmission Mission
using 22 Er-Doped Fiber
Amplifire Repeater ", ECOC'9
1 Post-deaspline paper]).
In this experiment, a transmission experiment was performed using an optical fiber including 23 stages of Er-doped fiber amplifiers, and a transmission distance of 1500 km was realized. The optical receiver uses an optical filter with a pass band of 1 nm that removes noise light.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の光受信
装置は、光増幅器を多段接続することにより、長距離光
ファイバ伝送が可能となる。しかしながら、光増幅器を
多段接続する場合、累積された雑音光間のビート雑音に
よる受信感度劣化が生じると同時し、光受信波形の消光
比劣化による受信回路の動作点のずれによる受信感度劣
化が生じる。このとき、光フィルタでは信号光の帯域内
にある雑音光を除去できず、消光比を改善することは出
来ない。The above-described conventional optical receiving apparatus is capable of long-distance optical fiber transmission by connecting optical amplifiers in multiple stages. However, when the optical amplifiers are connected in multiple stages, the reception sensitivity deteriorates due to the beat noise between the accumulated noise lights, and at the same time, the reception sensitivity deteriorates due to the shift of the operating point of the reception circuit due to the deterioration of the extinction ratio of the optical reception waveform. .. At this time, the optical filter cannot remove the noise light within the band of the signal light, and the extinction ratio cannot be improved.
【０００４】本発明の目的は、消光比劣化による受信感
度劣化を抑圧する光受信装置を提供することにある。It is an object of the present invention to provide an optical receiver which suppresses deterioration of reception sensitivity due to deterioration of extinction ratio.
【０００５】[0005]
【課題を解決するための手段】第１の本発明の光受信装
置は、光検出器と、前記光検出器の出力に接続される前
記増幅器と、前記前置増幅器の出力に接続されるピーク
値検出器と、前記前置増幅器の出力に接続される平均値
検出器と、前記ピーク値検出器と平均値検出器の出力に
接続され入力光信号のオフセット値を検出するオフセッ
ト値検出回路と、前記光検出器に直列に接続され前記前
置増幅器の入力に接続される定電流回路とを有する光受
信装置において、前記オフセット検出器の出力により前
記定電流回路を制御して前記前置増幅器に入力される電
気信号におけるオフセットを抑圧する。According to a first aspect of the present invention, there is provided a photodetector, a photodetector, the amplifier connected to the output of the photodetector, and a peak connected to the output of the preamplifier. A value detector, an average value detector connected to the output of the preamplifier, an offset value detection circuit connected to the outputs of the peak value detector and the average value detector to detect the offset value of the input optical signal, A constant current circuit connected in series to the photodetector and connected to an input of the preamplifier, wherein the preamplifier is controlled by the output of the offset detector. Suppresses the offset in the electrical signal input to.
【０００６】第２の本発明の光受信装置は、光検出器
と、前記光検出器の出力に接続される前置増幅器と、前
記前置増幅器の出力に接続されるピーク値検出器と、前
記光検出器に対して直列に接続される平均値検出器と、
前記ピーク値検出器と平均値検出器の出力に接続され入
力光信号のオフセット値を検出るるオフセット値検出回
路と、前記光検出器に直列に接続され前記前置増幅器の
入力に接続される定電流回路とを有する光受信装置にお
いて、前記オフセット検出器の出力により前記定電流回
路を制御して前記前置増幅器に入力される電気信号にお
けるオフセットを抑圧する。An optical receiver of the second invention is a photodetector, a preamplifier connected to the output of the photodetector, and a peak value detector connected to the output of the preamplifier. An average value detector connected in series with the photodetector,
An offset value detection circuit connected to the outputs of the peak value detector and the average value detector to detect the offset value of the input optical signal, and a constant value connected in series to the photodetector and connected to the input of the preamplifier. In the optical receiving device having a current circuit, the constant current circuit is controlled by the output of the offset detector to suppress the offset in the electric signal input to the preamplifier.
【０００７】[0007]
【作用】本発明では、消光比劣化を生じている入射光に
対して、その入射光のオフセット値を検出し、そのオフ
セット値に相当する光電流を除いたものを前置増幅器に
入力することにより、消光比劣化による受信感度劣化を
抑圧するものである。According to the present invention, for the incident light having the extinction ratio deterioration, the offset value of the incident light is detected, and the one excluding the photocurrent corresponding to the offset value is input to the preamplifier. Thus, the deterioration of the reception sensitivity due to the deterioration of the extinction ratio is suppressed.
【０００８】以下に図４を用いて本発明の作用を説明す
る。The operation of the present invention will be described below with reference to FIG.
【０００９】図４（Ａ）は消光比劣化を生じている入射
光を光検出器によって受光した光電流波形である。ここ
で光電流を前置増幅器によって電圧信号に変換し、その
オフセット値を検出する。この検出したオフセット値に
よって、光検出器に対して直列に接続される定電流回路
に流れる電流値を、図４（Ｂ）に示すように図４（Ａ）
における光電流のオフセット量と等しくなるよう制御す
る。これにより、前置増幅器へと入力される光電流を図
４（Ｃ）の様にオフセットの無いものにすることが出
来、光受信器における動作点ずれを抑圧し良好な受信感
度特性を得ることが可能となる。FIG. 4 (A) shows a photocurrent waveform of incident light, which has deteriorated extinction ratio, received by a photodetector. Here, the photocurrent is converted into a voltage signal by the preamplifier, and its offset value is detected. Based on the detected offset value, the current value flowing in the constant current circuit connected in series to the photodetector is shown in FIG. 4 (A) as shown in FIG. 4 (B).
It is controlled to be equal to the offset amount of the photocurrent at. As a result, the photocurrent input to the preamplifier can be made to have no offset as shown in FIG. 4C, and the deviation of the operating point in the optical receiver can be suppressed to obtain good reception sensitivity characteristics. Is possible.
【００１０】[0010]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の第１の実施例のブロック図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the first embodiment of the present invention.
【００１１】第１の実施例では、消光比劣化が生じた入
射光Ｐｉｎを光検出器１に入力する。光検出器１の出力
はトランスインピーダンス形の前置増幅器２に入力さ
れ、前置増幅器２の出力には平均値検出器３とピーク値
検出器４が接続される。平均値検出器３の出力及びピー
ク値検出器４の出力はオフセット値検出器５に入力さ
れ、オフト値検出器５の出力として前置増幅器２への入
力電流信号のオフセット値に対応した出力を得る。一
方、光検出器１には抵抗１０を介してトランジスタ１１
のコレクタが接続され、トランジスタ１１のエミッタは
電源Ｖに接続される。トランジスタ１２はベース及びコ
レクタがトランジスタ１１のベースに接続され、エミッ
タが電源Ｖ１に接続される。これら、抵抗１０、トラン
ジスタ１１、１２によって定電流回路６を形成し、オフ
セット検出器５の出力をトランジスタ１２のコレクタに
接続することにより、抵抗１０を流れる電流を調節す
る。In the first embodiment, the incident light Pin in which the extinction ratio has deteriorated is input to the photodetector 1. The output of the photodetector 1 is input to the transimpedance type preamplifier 2, and the average value detector 3 and the peak value detector 4 are connected to the output of the preamplifier 2. The output of the average value detector 3 and the output of the peak value detector 4 are input to the offset value detector 5, and the output corresponding to the offset value of the input current signal to the preamplifier 2 is output as the output of the offset value detector 5. obtain. On the other hand, the photodetector 1 is connected to the transistor 11 via the resistor 10.
Are connected to each other, and the emitter of the transistor 11 is connected to the power supply V. The base and collector of the transistor 12 are connected to the base of the transistor 11, and the emitter is connected to the power supply V1. The resistor 10 and the transistors 11 and 12 form a constant current circuit 6, and the output of the offset detector 5 is connected to the collector of the transistor 12 to adjust the current flowing through the resistor 10.
【００１２】第１の実施例によれば、前置増幅器２に入
力される電流信号におけるオフセットを数％以下に抑圧
することが出来、前置増幅器２における動作点ずれの無
い良好な受信装置が可能となった。伝送速度２．４Ｇｂ
／ｓにおけるＥｒ添加ファイバ増幅器を５０段用いた全
長２０００ｋｍの光ファイバ伝送実験では、従来と比べ
２ｄＢの感度改善が得られ、受信感度として−３２ｄＢ
ｍを実現した。According to the first embodiment, the offset in the current signal input to the preamplifier 2 can be suppressed to a few% or less, and a good receiving device with no operating point deviation in the preamplifier 2 can be provided. It has become possible. Transmission speed 2.4Gb
In an optical fiber transmission experiment with a total length of 2000 km using 50 stages of Er-doped fiber amplifiers at 1 / s, a sensitivity improvement of 2 dB was obtained compared with the conventional one, and the reception sensitivity was -32 dB.
realized m.
【００１３】次に、本発明の第２の実施例について図２
を用いて説明する。第２の実施例では定電流回路６ａが
インダクタ２０とＦＥＴ２１とによりなる光受信装置で
ある。ここで、インダクタ２０は光検出器１に対して直
列に接続され、インダクタ２０の他方の端子はＦＥＴ２
１のドレインに接続される。ＦＥＴ２１のソースは電源
Ｖ１に、ゲートはオフセット値検出器５の出力にそれぞ
れ接続される。Next, a second embodiment of the present invention will be described with reference to FIG.
Will be explained. In the second embodiment, the constant current circuit 6a is an optical receiver including an inductor 20 and an FET 21. Here, the inductor 20 is connected in series with the photodetector 1, and the other terminal of the inductor 20 is FET2.
1 is connected to the drain. The source of the FET 21 is connected to the power supply V1, and the gate is connected to the output of the offset value detector 5.
【００１４】第２の実施例においては、第１の実施例と
比べ光受信器としての雑音特性の改善が可能となり、伝
送速度２．４Ｇｂ／ｓにおけるＥｒ添加ファイバ増幅器
を５０段用いた全長２０００ｋｍの光ファイバ伝送実験
において、受信感度として−３３ｄＢｍを実現した。In the second embodiment, the noise characteristic as an optical receiver can be improved as compared with the first embodiment, and a total length of 2000 km using 50 stages of Er-doped fiber amplifiers at a transmission rate of 2.4 Gb / s. In the optical fiber transmission experiment of, a receiving sensitivity of -33 dBm was realized.
【００１５】次に、本発明の第３の実施例について図３
を用いて説明する。第３の実施例は、抵抗３０、コンデ
ンサ３１、増幅器３２からなる平均値検出器３ａを光検
出器１のカソード側に設けたものである。光検出器１の
カソードは、抵抗３０、コンデンサ３１からなる並列回
路を介して電源Ｖ２に接続される。ここで、高い入力イ
ンピーダンスを持った増幅器３２を抵抗３０と光検出器
１の接続点に接続することにより、増幅器３２の出力と
して、光検出器１によって生じる光電流の平均値に応じ
た電気信号を得る。この平均値検出器３ａの出力及びピ
ーク値検出器４の出力をオフセット検出器５に入力し、
オフセット検出器５の出力によって、定電流回路６の電
流値を制御する。Next, a third embodiment of the present invention will be described with reference to FIG.
Will be explained. In the third embodiment, an average value detector 3a including a resistor 30, a capacitor 31, and an amplifier 32 is provided on the cathode side of the photodetector 1. The cathode of the photodetector 1 is connected to the power supply V2 via a parallel circuit including a resistor 30 and a capacitor 31. Here, by connecting the amplifier 32 having a high input impedance to the connection point between the resistor 30 and the photodetector 1, an electric signal corresponding to the average value of the photocurrent generated by the photodetector 1 is output as the output of the amplifier 32. To get The output of the average value detector 3a and the output of the peak value detector 4 are input to the offset detector 5,
The output of the offset detector 5 controls the current value of the constant current circuit 6.
【００１６】第３の実施例によれば、第１の実施例と同
様の効果が得られると共に、平均値検出器３ａの構成が
簡便になり、伝送速度２．４Ｇｂ／ｓにおけるＥｒ添加
ファイバ増幅器を５０段用いた全長２０００ｋｍの光フ
ァイバ伝送実験において、受信感度として−３２ｄＢｍ
を実現した。According to the third embodiment, the same effect as that of the first embodiment is obtained, the structure of the average value detector 3a is simplified, and the Er-doped fiber amplifier at the transmission rate of 2.4 Gb / s is obtained. In an optical fiber transmission experiment with a total length of 2000 km using 50 stages, the reception sensitivity was -32 dBm.
Was realized.
【００１７】以上、本発明の実施例として、２つのトラ
ンジスタを用いた電流ミラー回路、或はＦＥＴを用いた
定電流回路により実施例を説明したが、これはこの外の
どの様な定電流回路を用いても実現可能である。As described above, the embodiment of the present invention has been described by using the current mirror circuit using two transistors or the constant current circuit using the FET. However, this is not limited to this constant current circuit. Can also be realized by using.
【００１８】また、本実施例の前置増幅器として、トラ
ンスインピーダンス形を用いて説明したが、これはどの
様な前置増幅器を用いても実現可能である。Although the transimpedance type has been described as the preamplifier of this embodiment, this can be realized by using any preamplifier.
【００１９】また、本実施例で用いた平均値検出器、ピ
ーク値検出器、オフセット値検出器はどの様な回路構成
のものを用いてもよい。The average value detector, peak value detector, and offset value detector used in this embodiment may have any circuit configuration.
【００２０】[0020]
【発明の効果】以上説明したように本発明によれば、消
光比劣化をした光入力に対し、常に最適な光受信器の動
作を保つことが出来、しかも従来からある部品、技術に
よって容易に実現が可能である。As described above, according to the present invention, it is possible to always maintain the optimum operation of the optical receiver with respect to the optical input having the deteriorated extinction ratio, and moreover, it is easy to use the existing parts and techniques. Realization is possible.
【図１】本発明の光受信装置の第１の実施例のブロック
図である。FIG. 1 is a block diagram of a first embodiment of an optical receiver according to the present invention.
【図２】本発明の光受信装置の第２の実施例のブロック
図である。FIG. 2 is a block diagram of a second embodiment of the optical receiving apparatus of the present invention.
【図３】本発明の光受信装置の第２の実施例のブロック
図である。FIG. 3 is a block diagram of a second embodiment of the optical receiving apparatus of the present invention.
【図４】本発明の作用を説明するための図である。FIG. 4 is a diagram for explaining the operation of the present invention.
【図５】従来の光受信装置の一例を示すブロック図であ
る。FIG. 5 is a block diagram showing an example of a conventional optical receiver.
Ｐｉｎ 入射光 １ 光検出器 ２ 前置増幅器 ３，３ａ 平均値検出器 ４ ピーク値検出器 ５ オフセット検出器 ６，６ａ 定電流回路 １０，３０ 抵抗 １１，１２ トランジスタ ２０ インダクタ ２１ ＦＥＴ ３１ コンデンサ ３２ 増幅器 ５０ 半導体レーザ ５１ 半導体光変調器 ５２，５４，５７ 光アンプ ５３，５５ 光ファイバ ５６ 光フィルタ ５８ 光受信器 Ｖ１，Ｖ２ 電源 Pin Incident light 1 Photodetector 2 Preamplifier 3,3a Average value detector 4 Peak value detector 5 Offset detector 6,6a Constant current circuit 10,30 Resistor 11,12 Transistor 20 Inductor 21 FET 31 Capacitor 32 Amplifier 50 Semiconductor laser 51 Semiconductor optical modulator 52, 54, 57 Optical amplifier 53, 55 Optical fiber 56 Optical filter 58 Optical receiver V1, V2 Power supply
Claims (2)
される前記増幅器と、前記前置増幅器の出力に接続され
るピーク値検出器と、前記前置増幅器の出力に接続され
る平均値検出器と、前記ピーク値検出器と平均値検出器
の出力に接続され入力光信号のオフセット値を検出する
オフセット値検出回路と、前記光検出器に直列に接続さ
れ前記前置増幅器の入力に接続される定電流回路とを有
する光受信装置において、前記オフセット検出器の出力
により前記定電流回路を制御して前記前置増幅器に入力
される電気信号におけるオフセットを抑圧することを特
徴とする光受信装置。1. A photodetector, said amplifier connected to the output of said photodetector, a peak value detector connected to the output of said preamplifier, and connected to the output of said preamplifier. An average value detector, an offset value detection circuit connected to the output of the peak value detector and the average value detector to detect the offset value of the input optical signal, and of the preamplifier connected in series to the photodetector In a light receiving device having a constant current circuit connected to an input, the constant current circuit is controlled by the output of the offset detector to suppress an offset in an electric signal input to the preamplifier. Optical receiving device.
される前置増幅器と、前記前置増幅器の出力に接続され
るピーク値検出器と、前記光検出器に対して直列に接続
される平均値検出器と、前記ピーク値検出器と平均値検
出器の出力に接続され入力光信号のオフセット値を検出
るるオフセット値検出回路と、前記光検出器に直列に接
続され前記前置増幅器の入力に接続される定電流回路と
を有する光受信装置において、前記オフセット検出器の
出力により前記定電流回路を制御して前記前置増幅器に
入力される電気信号におけるオフセットを抑圧すること
を特徴とする光受信装置。2. A photodetector, a preamplifier connected to the output of the photodetector, a peak value detector connected to the output of the preamplifier, and a serial detector for the photodetector. An average value detector connected, an offset value detection circuit connected to the output of the peak value detector and the average value detector to detect the offset value of the input optical signal, and the serially connected to the photodetector the front In a light receiving device having a constant current circuit connected to an input of a preamplifier, controlling the constant current circuit by the output of the offset detector to suppress an offset in an electric signal input to the preamplifier. An optical receiving device characterized by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4026303A JP3021913B2 (en) | 1992-02-13 | 1992-02-13 | Optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4026303A JP3021913B2 (en) | 1992-02-13 | 1992-02-13 | Optical receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05227104A true JPH05227104A (en) | 1993-09-03 |
| JP3021913B2 JP3021913B2 (en) | 2000-03-15 |
Family
ID=12189593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4026303A Expired - Fee Related JP3021913B2 (en) | 1992-02-13 | 1992-02-13 | Optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3021913B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06232917A (en) * | 1992-11-13 | 1994-08-19 | American Teleph & Telegr Co <Att> | Digital data receiver |
| JPH06232916A (en) * | 1992-11-13 | 1994-08-19 | American Teleph & Telegr Co <Att> | Digital data receiver |
| US5714895A (en) * | 1994-11-01 | 1998-02-03 | Fujitsu Limited | Mean value detecting apparatus and mean value detecting integrated circuit having an offset voltage adjusting circuit |
| US5822104A (en) * | 1995-02-24 | 1998-10-13 | Nec Corporation | Digital optical receiving apparatus |
| EP0844736A3 (en) * | 1996-11-25 | 1998-12-30 | Sharp Kabushiki Kaisha | Waveform-Shaping circuit and a data-transmitting apparatus using such a circuit |
| US6342694B1 (en) | 1998-08-25 | 2002-01-29 | Oki Electric Industry Co., Ltd. | Adjustable-free optical signal receiver |
| WO2011120757A1 (en) * | 2010-03-30 | 2011-10-06 | Austriamicrosystems Ag | Amplifier circuit, detector arrangement and method for operating an amplifier |
| US8207488B2 (en) | 2005-03-14 | 2012-06-26 | Hamamatsu Photonics K.K. | Photodetector circuit |
-
1992
- 1992-02-13 JP JP4026303A patent/JP3021913B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06232917A (en) * | 1992-11-13 | 1994-08-19 | American Teleph & Telegr Co <Att> | Digital data receiver |
| JPH06232916A (en) * | 1992-11-13 | 1994-08-19 | American Teleph & Telegr Co <Att> | Digital data receiver |
| US5714895A (en) * | 1994-11-01 | 1998-02-03 | Fujitsu Limited | Mean value detecting apparatus and mean value detecting integrated circuit having an offset voltage adjusting circuit |
| US5822104A (en) * | 1995-02-24 | 1998-10-13 | Nec Corporation | Digital optical receiving apparatus |
| EP0844736A3 (en) * | 1996-11-25 | 1998-12-30 | Sharp Kabushiki Kaisha | Waveform-Shaping circuit and a data-transmitting apparatus using such a circuit |
| US6038049A (en) * | 1996-11-25 | 2000-03-14 | Sharp Kabushiki Kaisha | Waveform-shaping circuit and a data-transmitting apparatus using such a circuit |
| US6342694B1 (en) | 1998-08-25 | 2002-01-29 | Oki Electric Industry Co., Ltd. | Adjustable-free optical signal receiver |
| US8207488B2 (en) | 2005-03-14 | 2012-06-26 | Hamamatsu Photonics K.K. | Photodetector circuit |
| WO2011120757A1 (en) * | 2010-03-30 | 2011-10-06 | Austriamicrosystems Ag | Amplifier circuit, detector arrangement and method for operating an amplifier |
| US8779858B2 (en) | 2010-03-30 | 2014-07-15 | Ams Ag | Amplifier circuit, detector arrangement and method for operating an amplifier |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3021913B2 (en) | 2000-03-15 |
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