JPH0738419A - Complementary optical wiring circuit - Google Patents
Complementary optical wiring circuitInfo
- Publication number
- JPH0738419A JPH0738419A JP17573293A JP17573293A JPH0738419A JP H0738419 A JPH0738419 A JP H0738419A JP 17573293 A JP17573293 A JP 17573293A JP 17573293 A JP17573293 A JP 17573293A JP H0738419 A JPH0738419 A JP H0738419A
- Authority
- JP
- Japan
- Prior art keywords
- light receiving
- pulse
- output
- time
- 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.)
- Granted
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Landscapes
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Electronic Switches (AREA)
- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高速動作可能で、符号
誤り率の低い、相補型光配線回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a complementary optical wiring circuit which can operate at high speed and has a low code error rate.
【０００２】[0002]
【従来の技術】相補型光配線は、電気回路における相補
型ＭＯＳ論理回路の信号伝送に相当するもので、相補型
ＭＯＳ論理回路の場合と同様に、信号伝送に伴う消費電
力の大幅な減少を目的とするものである（例えば、古山
英人、中村 優：応用物理第６２巻 １９９３、４
０）。図３に、この従来例を示す。まず、送信側の素子
の電圧信号を、図示の入力端子７から微分回路５に入力
して電流微分波形を得る。これを、正負両極性に対して
相補的に並列接続された発光ダイオードもしくは半導体
レーザ２１、２２に入力することによって、最初の電圧
信号のパルス幅分の時間間隔をもった２個の光パルス信
号が得られる。これを、光伝送路３１、３２を経由し
て、やはり相補的に接続され、必要に応じて電源４１、
４２でバイアスされた２個の半導体受光素子１０１、１
０２で受光して、連続した２個の正負の電気パルス信号
に変換し、さらに積分回路６で積分することによって元
の電圧信号波形を得ることができる。この際、元の電圧
信号波形（微分波形）、すなわち信号の変化点における
パルス幅の短い信号のみが光信号として伝送されるの
で、信号伝送に伴う消費電力を大幅に減少することが可
能になる。2. Description of the Related Art Complementary type optical wiring corresponds to signal transmission of a complementary MOS logic circuit in an electric circuit, and as in the case of a complementary MOS logic circuit, the power consumption accompanying the signal transmission is greatly reduced. It is intended (for example, Hideto Furuyama, Yu Nakamura: Applied Physics Vol. 62, 1993, 4).
0). FIG. 3 shows this conventional example. First, the voltage signal of the element on the transmission side is input to the differentiating circuit 5 from the illustrated input terminal 7 to obtain a current differential waveform. By inputting this to the light emitting diodes or the semiconductor lasers 21 and 22 which are connected in parallel complementary to both positive and negative polarities, two optical pulse signals having a time interval corresponding to the pulse width of the first voltage signal are input. Is obtained. These are also connected complementarily via the optical transmission lines 31 and 32, and if necessary, a power source 41,
Two semiconductor light receiving elements 101, 1 biased by 42
The light is received by 02, converted into two continuous positive and negative electric pulse signals, and further integrated by the integrating circuit 6, whereby the original voltage signal waveform can be obtained. At this time, only the original voltage signal waveform (differential waveform), that is, only the signal having a short pulse width at the signal change point is transmitted as the optical signal, so that it is possible to significantly reduce the power consumption accompanying the signal transmission. .
【０００３】なお、従来技術では、上記の回路における
半導体受光素子１０１、１０２として、通常のｐｎ接合
電極等の非対称構造のフォトダイオードが用いられてい
た。In the prior art, a photodiode having an asymmetric structure such as a normal pn junction electrode is used as the semiconductor light receiving elements 101 and 102 in the above circuit.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来技術に係
る相補型光配線では、受信側の受光素子１０１、１０２
として通常のフォトダイオードを用いているが、その非
対称なＰＮ接合構造のために、両受光素子１０１、１０
２から得られる正負の電流信号波形が、完全に対称な形
とはならなかった。また、通常のフォトダイオードの場
合、受光面積を極端に小さくしない限り応答速度は速く
ならず、特にパルスの立下り部分が裾を引きやすいた
め、送信側の光パルスの時間間隔が短い場合には、得ら
れた２個の電流パルスが重なってしまうことがあった。
これらの理由により、論理振幅におけるノイズマージン
が低減してしまい、符号誤り率が大きくなってしまう問
題があった。However, in the complementary optical wiring according to the prior art, the light receiving elements 101 and 102 on the receiving side are provided.
Although a normal photodiode is used as the light receiving element 101, because of its asymmetrical PN junction structure,
The positive and negative current signal waveforms obtained from 2 did not have a perfectly symmetrical shape. Also, in the case of a normal photodiode, the response speed does not increase unless the light-receiving area is made extremely small, and the trailing edge of the pulse is easy to draw a tail. , The obtained two current pulses sometimes overlap.
For these reasons, there is a problem that the noise margin in the logical amplitude is reduced and the code error rate is increased.
【０００５】そこで、本発明はこれらの問題点を解決す
るために完成されたもので、高速動作可能で符号誤り率
の小さい相補型光配線回路を提供することを目的とす
る。The present invention has been completed to solve these problems, and an object of the present invention is to provide a complementary optical wiring circuit capable of operating at high speed and having a small code error rate.
【０００６】[0006]
【課題を解決するための手段】上記問題点を解決するた
めに、本発明に係る相補型光配線回路は、極性が相補的
に並列接続された２個の発光ダイオードもしくは半導体
レーザに、２個ごとに対をなす電流パルスを入力して２
個の光パルス信号対に変換し、これを、互いに逆極性の
バイアス電圧が印加された、一対のショットキ電極が半
導体基板表面上に向かい合って形成された構造の、２個
の半導体受光素子のそれぞれに入力し、２個の半導体受
光素子の接続点において元のパルス対毎に１個の対応し
た電気パルス信号出力を得るようになされることを特徴
とする。In order to solve the above problems, a complementary optical wiring circuit according to the present invention has two light emitting diodes or two semiconductor lasers connected in parallel with complementary polarities. Input a pair of current pulses for each 2
Each of the two semiconductor light receiving elements having a structure in which a pair of Schottky electrodes to which bias voltages of opposite polarities are applied are formed so as to face each other on the surface of the semiconductor substrate. Is input to each of the two semiconductor light-receiving elements to obtain one corresponding electric pulse signal output for each original pulse pair.
【０００７】また、上記の相補型光配線回路において、
２個の半導体受光素子に印加されるバイアス電圧の極性
を変えることによって、出力される連続した２個の電気
パルス信号の極性を変化させるようになされたことを特
徴とする。In the above complementary optical wiring circuit,
The present invention is characterized in that the polarities of two consecutive electric pulse signals that are output are changed by changing the polarities of the bias voltages applied to the two semiconductor light receiving elements.
【０００８】[0008]
【作用】上記の構成によれば、２個の発光ダイオードも
しくは半導体レーザからの２個の光パルスを、一対のシ
ョットキ電極が半導体基板表面上に向かい合って形成さ
れた構造の、２個の半導体受光素子のそれぞれに入力
し、２個の半導体受光素子の接続点において元のパルス
対毎に１個の対応した電気パルス信号出力を得ているの
で、ショットキ電極が向かい合って形成された構造の両
方の半導体受光素子から、お互いにほぼ完全に対称な、
もしくは等しい電流信号波形が出力される。According to the above structure, two semiconductor lasers having a structure in which two light pulses from two light emitting diodes or semiconductor lasers are formed with a pair of Schottky electrodes facing each other on the surface of the semiconductor substrate. Since the electric pulse signal is input to each of the elements and one corresponding electric pulse signal output is obtained for each original pulse pair at the connection point of the two semiconductor light receiving elements, the Schottky electrodes of both of the structures formed facing each other are obtained. From the semiconductor photo detector, they are almost completely symmetrical to each other,
Alternatively, the same current signal waveform is output.
【０００９】[0009]
【実施例】以下、添付図面を参照して本発明に係る実施
例について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１０】本発明の実施例に係る相補型光配線回路で
は、受光回路が２個のＭＳＭ−ＰＤ、すなわち一対のシ
ョットキ電極が向かい合って形成された対称接合構造の
半導体受光素子を２個用いて構成されるために、両方の
ＭＳＭ−ＰＤから、お互いにほぼ完全に対称な、もしく
は等しい電流信号波形が出力される。これによって、最
終的にこれらの出力電流を積分して得られる電圧波形
が、元の送信側の回路の出力波形とほぼ等しくすること
ができるため、符号誤り率を最小限に抑えた光信号伝送
回路を構成することができる。In the complementary optical wiring circuit according to the embodiment of the present invention, the light receiving circuit uses two MSM-PDs, that is, two semiconductor light receiving elements having a symmetrical junction structure in which a pair of Schottky electrodes face each other. Due to the configuration, both MSM-PDs output current signal waveforms that are almost completely symmetrical or equal to each other. As a result, the voltage waveform finally obtained by integrating these output currents can be made almost the same as the output waveform of the original circuit on the transmission side, so optical signal transmission with a minimum code error rate is achieved. A circuit can be constructed.
【００１１】また、ＭＳＭ−ＰＤは半導体基板表面上に
平面的に構成されており、電極間容量が少ないため、等
しい受光面積をもつ通常の縦形構造のフォトダイオード
に比べて応答速度が非常に速い。特に、ＭＳＭ−ＰＤは
立上り、立下り時間が共に短いので、送信側の光パルス
の時間間隔がかなり短い場合でも、得られた２個の電流
パルス波形が重ならないように受信することができる。
従って、本発明による受光回路においては超高速度の信
号処理が可能である。Further, the MSM-PD is planarly formed on the surface of the semiconductor substrate and has a small inter-electrode capacitance, so that the response speed is much higher than that of a normal vertical photodiode having an equal light receiving area. . In particular, since the MSM-PD has both a rising time and a falling time, the two current pulse waveforms obtained can be received without overlapping even when the time interval of the optical pulse on the transmitting side is considerably short.
Therefore, in the light receiving circuit according to the present invention, ultra high speed signal processing is possible.
【００１２】図１は、本発明の第１実施例に係る相補型
光配線回路を示したものである。図の右側の回路が受光
回路であり、ここにおける受光素子としてＭＳＭ−ＰＤ
１１、１２が用いられる。ＭＳＭ−ＰＤ１１、１２は、
半導体基板表面上にショットキ電極が向かい合って形成
された対称接合構造のために、正負両極性のバイアス電
圧を印加することができ、そのどちらの極性においても
常にどちらか一方の電極が逆バイアス電圧状態になるの
で、暗電流は常に少なく保つことができる。また、どち
らの極性のバイアス電圧を印加しても、両電極間の電位
差が等しい限り、素子内部の電位分布ないしエネルギー
状態は等しいので、等しい光入力に対して得られる出力
電流の大きさは常に等しい。よって、入力する光パルス
波形が等しければ、図１の受光回路において、双方のバ
イアス電圧４１、４２を互いに逆極性で大きさが等しく
なるように設定することにより、波形がほぼ完全に等し
く極性だけが反転した電流パルス列を得ることができ
る。よって、これを積分して得られる出力信号は、元の
送信側の電圧波形にほぼ等しい波形に復元することがで
きる。FIG. 1 shows a complementary optical wiring circuit according to the first embodiment of the present invention. The circuit on the right side of the figure is a light receiving circuit, and the light receiving element here is MSM-PD.
11 and 12 are used. MSM-PD11,12,
Due to the symmetrical junction structure in which Schottky electrodes are formed on the surface of the semiconductor substrate so that they face each other, it is possible to apply a bias voltage of both positive and negative polarities. Therefore, the dark current can be kept small at all times. In addition, no matter which bias voltage is applied, as long as the potential difference between both electrodes is the same, the potential distribution or energy state inside the element is the same, so the magnitude of the output current obtained for the same optical input is always the same. equal. Therefore, if the input optical pulse waveforms are equal, by setting both bias voltages 41 and 42 in the light receiving circuit of FIG. It is possible to obtain a current pulse train in which is reversed. Therefore, the output signal obtained by integrating this can be restored to a waveform substantially equal to the original voltage waveform on the transmission side.
【００１３】次に、本回路の動作について説明する。図
１には、上段の回路図の左側（送信側）、中間（光伝送
路）および右側（受光側）に対応して、それぞれの電圧
および電流波形が下段に示してある。送信側の入力端子
７に入力されたパルス時間幅ｔw の電圧信号が微分回路
５に入力されることにより、ｔw の時間差をもった、連
続した正負２個の電流パルスが得られる。これを互いに
極性が逆向きに並列接続された発光ダイオードもしくは
半導体レーザ２１、２２に入力することにより、正の電
流パルスは発光ダイオードもしくは半導体レーザ２１で
光信号に変換され、ｔw 遅れて負の電流パルスが発光ダ
イオードもしくは半導体レーザ２２で光信号に変換され
る。これらは別々の光伝送路３１、３２を通って、それ
ぞれ対応するＭＳＭ−ＰＤ１１、１２にｔw の時間差を
もって入力される。ＭＳＭ−ＰＤ１１には正のバイアス
電圧４１が印加されているので正の電流パルスが出力さ
れ、一方、負のバイアス電圧４２が印加されたＭＳＭ−
ＰＤ１２からは負の電流パルスがｔw 遅れて出力され
る。これらは接続端子でｔw の時間差をもった２個の連
続した電流パルスとなり、積分回路６に入力されること
によって、ｔw のパルス幅をもった元の送信側の出力信
号に等しい電圧パルスが、出力端子８において得られ
る。Next, the operation of this circuit will be described. In FIG. 1, voltage and current waveforms are shown in the lower part of the circuit diagram in the upper part, corresponding to the left side (transmitting side), the middle part (optical transmission line) and the right side (light receiving side). By inputting the voltage signal having the pulse time width t w input to the input terminal 7 on the transmission side to the differentiating circuit 5, two continuous positive and negative current pulses having a time difference of t w can be obtained. By entering it into the light-emitting diodes or semiconductor lasers 21 and 22 polarities are connected in parallel in opposite directions, positive current pulses are converted into optical signals by the light emitting diode or a semiconductor laser 21, t w delayed negative The current pulse is converted into an optical signal by the light emitting diode or the semiconductor laser 22. These are input to the corresponding MSM-PDs 11 and 12 respectively with a time difference of t w through separate optical transmission lines 31 and 32. Since the positive bias voltage 41 is applied to the MSM-PD 11, a positive current pulse is output, while the negative bias voltage 42 is applied to the MSM-PD 11.
A negative current pulse is output from the PD 12 with a delay of t w . These are two continuous current pulses having a time difference of t w at the connection terminal, and by being input to the integrating circuit 6, a voltage pulse equal to the original output signal of the transmitting side having a pulse width of t w. At the output terminal 8.
【００１４】次に、図２に基づいて本発明の第２実施例
に係る相補型光配線回路について説明する。第２実施例
は、第１実施例に係る相補型光配線回路と基本的には同
一の構成であるが、後段に接続される電子回路に応じ
て、両方のＭＳＭ−ＰＤ１１、１２に印加されるバイア
ス電圧４１、４２の極性を等しくして、出力される２個
の連続した電流パルスの極性を等しくしたものである。
ＭＳＭ−ＰＤ１１、１２の接続点にはＴ−フリップフロ
ップ回路（Ｔ−ＦＦ）６の入力端子Ｔが接続され、出力
端子Ｑから端子８に出力信号が出力される。Next, a complementary optical wiring circuit according to the second embodiment of the present invention will be described with reference to FIG. The second embodiment has basically the same configuration as the complementary optical wiring circuit according to the first embodiment, but is applied to both MSM-PDs 11 and 12 depending on the electronic circuit connected in the subsequent stage. The bias voltages 41 and 42 are set to have the same polarity, and the two consecutive current pulses output have the same polarity.
The input terminal T of the T-flip-flop circuit (T-FF) 6 is connected to the connection point of the MSM-PDs 11 and 12, and an output signal is output from the output terminal Q to the terminal 8.
【００１５】これらの過程において、伝送される光信号
は送信側の出力パルスの変化部分においてのみ出力され
るので、波形をそのまま光信号に変換して伝送する場合
と比較して、伝送に伴う消費電力が大幅に減少できる。
しかしこの方法では、微分、積分等の信号波形の変換が
行われるので、これらの過程において、素子や回路の特
性に左右されない正確な信号変換が行われることが、符
号誤りを避けるために必要である。本実施例では、受光
素子として対称接合構造のＭＳＭ−ＰＤを用いているた
め、通常の非対称構造のフォトダイオードを用いる場合
とは異なり、正、負の出力電流がほぼ完全な対称波形で
得られる。加えて、ＭＳＭ−ＰＤの応答速度は通常のフ
ォトダイオードに比べて速いので、より高速の送信レー
トに対しても正確に動作する。これらのことから、高速
かつ符号誤り率の少ない、より正確な信号伝送が可能に
なる。In these processes, the optical signal to be transmitted is output only in the changing portion of the output pulse on the transmitting side, so that it is consumed in transmission as compared with the case where the waveform is converted into an optical signal as it is and transmitted. Electricity can be greatly reduced.
However, in this method, since signal waveform conversion such as differentiation and integration is performed, it is necessary to perform accurate signal conversion that is not affected by the characteristics of elements and circuits in these processes in order to avoid code errors. is there. In the present embodiment, since the MSM-PD having a symmetrical junction structure is used as the light receiving element, positive and negative output currents can be obtained with substantially perfect symmetrical waveforms, unlike the case where a photodiode having a normal asymmetric structure is used. . In addition, since the response speed of the MSM-PD is faster than that of a normal photodiode, the MSM-PD operates accurately even at a higher transmission rate. For these reasons, more accurate signal transmission at high speed with a small code error rate becomes possible.
【００１６】[0016]
【発明の効果】以上、詳細に説明した通り、本発明に係
る相補型光配線回路により、高速で、符号誤り率の低い
相補型光配線が可能になった。これにより、素子間やプ
リント基板間あるいは装置間の光配線において、より高
速で信頼性の高い低消費電力の光配線が可能になる。こ
れらは主としてスーパーコンピュータ等の高速演算シス
テムに応用でき、将来において演算速度を制限すると考
えられる電気配線に代わるものとして期待できる。As described above in detail, the complementary optical wiring circuit according to the present invention enables high-speed complementary optical wiring with a low code error rate. As a result, in the optical wiring between the elements, between the printed boards, or between the devices, it is possible to realize a faster and more reliable optical wiring with low power consumption. These can be mainly applied to high-speed computing systems such as supercomputers, and can be expected as a substitute for electrical wiring that will limit the computing speed in the future.
【図１】本発明の第１実施例に係る相補型光配線回路を
示した回路図である。FIG. 1 is a circuit diagram showing a complementary optical wiring circuit according to a first exemplary embodiment of the present invention.
【図２】本発明の第２実施例に係る相補型光配線回路を
示した回路図である。FIG. 2 is a circuit diagram showing a complementary optical wiring circuit according to a second exemplary embodiment of the present invention.
【図３】従来例に係る相補型光配線回路を示した回路図
である。FIG. 3 is a circuit diagram showing a complementary optical wiring circuit according to a conventional example.
１１、１２…ＭＳＭ−ＰＤ、２１、２２…発光ダイオー
ドもしくは半導体レーザ、３１、３２…光伝送路、４
１、４２…バイアス電圧源、５…微分回路、６…積分回
路、７…送信回路側の入力端子、８…受信回路側の出力
端子、１０１、１０２…通常のフォトダイオード。11, 12 ... MSM-PD, 21, 22 ... Light emitting diode or semiconductor laser, 31, 32 ... Optical transmission line, 4
1, 42 ... Bias voltage source, 5 ... Differentiating circuit, 6 ... Integrating circuit, 7 ... Transmitting circuit side input terminal, 8 ... Receiving circuit side output terminal, 101, 102 ... Normal photodiode.
───────────────────────────────────────────────────── 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 10/26 10/14 10/04 10/06 (72)発明者 飯田 孝 静岡県浜松市市野町1126番地の１ 浜松ホ トニクス株式会社内 (72)発明者 藁科 禎久 静岡県浜松市市野町1126番地の１ 浜松ホ トニクス株式会社内 (72)発明者 杉本 賢一 静岡県浜松市市野町1126番地の１ 浜松ホ トニクス株式会社内 (72)発明者 鈴木 智子 静岡県浜松市市野町1126番地の１ 浜松ホ トニクス株式会社内 (72)発明者 菅 博文 静岡県浜松市市野町1126番地の１ 浜松ホ トニクス株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI Technical indication location H04B 10/26 10/14 10/04 10/06 (72) Inventor Takashi Iida Ichino, Hamamatsu City, Shizuoka Prefecture 1126, Hamamatsu Photonics Co., Ltd. in Hamamatsu Photonics Co., Ltd. (72) The inventor Sadahisa Warashi, 1126, Ichinocho, Hamamatsu, Shizuoka Prefecture 1 No. 1 in Hamamatsu Photonics Co., Ltd. (72) Kenichi Sugimoto 1 Hamamatsu Photonics Co., Ltd. (72) Inventor Tomoko Suzuki 1126 1 Nono, Ichimachi, Hamamatsu City, Shizuoka Prefecture 1 Hamamatsu Photonics Co., Ltd. (72) Hirofumi Suga 1 126 1 Nono, Ichimachi, Hamamatsu City, Shizuoka Prefecture Hamamatsu Photonics Within the corporation
Claims (2)
光ダイオードもしくは半導体レーザに、２個ごとに対を
なす電流パルスを入力して２個の光パルス信号対に変換
し、この対のうちのそれぞれを、互いに逆極性のバイア
ス電圧が印加された、一対のショットキ電極が半導体基
板表面上に向かい合って形成された構造の、２個の半導
体受光素子のそれぞれに入力し、２個の前記半導体受光
素子の接続点において元のパルス対毎に１個の対応した
電気パルス信号出力を得るようになされることを特徴と
する相補型光配線回路。1. A pair of light-emitting diodes or semiconductor lasers whose polarities are complementarily connected in parallel, each pair of current pulses are input to be converted into two pairs of optical pulse signals. Each of the two is input to each of two semiconductor light receiving elements having a structure in which a pair of Schottky electrodes to which bias voltages of opposite polarities are applied are formed facing each other on the surface of the semiconductor substrate, A complementary optical wiring circuit, wherein one corresponding electric pulse signal output is obtained for each original pulse pair at a connection point of the semiconductor light receiving element.
いて、２個の前記半導体受光素子に印加されるバイアス
電圧の極性を変えることによって、出力される連続した
２個の電気パルス信号の極性を変化させるようになされ
たことを特徴とする相補型光配線回路。2. The complementary optical wiring circuit according to claim 1, wherein two consecutive electric pulse signals output by changing the polarities of the bias voltages applied to the two semiconductor light receiving elements. A complementary optical wiring circuit characterized in that the polarity is changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17573293A JP2721475B2 (en) | 1993-07-15 | 1993-07-15 | Complementary optical wiring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17573293A JP2721475B2 (en) | 1993-07-15 | 1993-07-15 | Complementary optical wiring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0738419A true JPH0738419A (en) | 1995-02-07 |
| JP2721475B2 JP2721475B2 (en) | 1998-03-04 |
Family
ID=16001276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17573293A Expired - Fee Related JP2721475B2 (en) | 1993-07-15 | 1993-07-15 | Complementary optical wiring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721475B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037212A1 (en) * | 2005-09-28 | 2007-04-05 | Nec Corporation | Light receiving circuit and digital system |
| JP2009302703A (en) * | 2008-06-11 | 2009-12-24 | Toshiba Corp | Complementary optical wiring system |
| JP2010028751A (en) * | 2008-07-24 | 2010-02-04 | Toshiba Corp | Complementary optical wiring apparatus |
| JP2010136244A (en) * | 2008-12-08 | 2010-06-17 | Toshiba Corp | Transmission circuit and complementary optical wiring system |
-
1993
- 1993-07-15 JP JP17573293A patent/JP2721475B2/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007037212A1 (en) * | 2005-09-28 | 2007-04-05 | Nec Corporation | Light receiving circuit and digital system |
| US8023832B2 (en) | 2005-09-28 | 2011-09-20 | Nec Corporation | Light receiving circuit and digital system |
| JP4936071B2 (en) * | 2005-09-28 | 2012-05-23 | 日本電気株式会社 | Light receiving circuit and digital system |
| JP2009302703A (en) * | 2008-06-11 | 2009-12-24 | Toshiba Corp | Complementary optical wiring system |
| JP2010028751A (en) * | 2008-07-24 | 2010-02-04 | Toshiba Corp | Complementary optical wiring apparatus |
| JP2010136244A (en) * | 2008-12-08 | 2010-06-17 | Toshiba Corp | Transmission circuit and complementary optical wiring system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2721475B2 (en) | 1998-03-04 |
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| LAPS | Cancellation because of no payment of annual fees |