JP2008010990A

JP2008010990A - Optical receiver

Info

Publication number: JP2008010990A
Application number: JP2006177363A
Authority: JP
Inventors: Hiroyuki Fukuyama; 裕之福山; Michihiro Hirata; 道広平田; Koichi Murata; 浩一村田; Koichi Sano; 公一佐野
Original assignee: Nippon Telegraph and Telephone Corp
Current assignee: Nippon Telegraph and Telephone Corp
Priority date: 2006-06-27
Filing date: 2006-06-27
Publication date: 2008-01-17

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and power consumption of an optical transmission apparatus by enabling the single power supply operation of an optical receiver and by dispensing with a sequencer for controlling the order of on/off of a power supply when inserting and extracting a live line. <P>SOLUTION: There are provided: first and second photodiodes PD1, PD2, where a first polar terminal is connected to a first power line 200; and a differential transimpedance amplifier 101 that is connected to the first power line 200 and a second power line 300 for operation, where a second polar terminal of the first photodiode PD1 is connected to a non-inverted input terminal, and the second polar terminal of the second photodiode PD2 is connected to an inverted input terminal. Voltage applied across both the ends of the first and second photodiodes PD1, PD2 is within a recommended operating voltage of the first and second photodiodes PD1, PD2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、光伝送装置中に用いられ、活線挿抜に対応し、かつ光伝送装置の小型化、低消費電力化に寄与する光受信器の構成技術に関する。 The present invention relates to a configuration technique of an optical receiver that is used in an optical transmission device, supports hot-swapping, and contributes to downsizing and low power consumption of the optical transmission device.

図１１は光差動位相変調（以下、光ＤＰＳＫと称す。）信号受信器（例えば、非特許文献１参照）の構成を示す図である。本光ＤＰＳＫ信号受信器は、マッハ−ツェンダ干渉計４００と光受信器５００ら構成されている。マッハ−ツェンダ干渉計４００は、１ビット遅延器４０１、光信号が入力する光信号入力端子４０２、光信号が出力する光信号出力端子４０３，４０４を有する。また、光受信器５００はトランスインピーダンス増幅器５０１、フォトダイオードＰＤ３，ＰＤ４、トランスインピーダンス増幅器５０１の電源端子５０２，５０３、フォトダイオードＰＤ３，ＰＤ４の電源端子５０４，５０５、出力端子５０６を有する。 FIG. 11 is a diagram illustrating a configuration of an optical differential phase modulation (hereinafter referred to as optical DPSK) signal receiver (see, for example, Non-Patent Document 1). This optical DPSK signal receiver includes a Mach-Zehnder interferometer 400 and an optical receiver 500. The Mach-Zehnder interferometer 400 includes a 1-bit delay unit 401, an optical signal input terminal 402 for inputting an optical signal, and optical signal output terminals 403 and 404 for outputting an optical signal. The optical receiver 500 includes a transimpedance amplifier 501, photodiodes PD3 and PD4, power terminals 502 and 503 of the transimpedance amplifier 501, power terminals 504 and 505 of the photodiodes PD3 and PD4, and an output terminal 506.

本光ＤＰＳＫ信号受信器の光入力端子４０２に位相変調された光信号が入射すると、マッハ−ツェンダ干渉計４００の作用により、１ビット遅延器４０１によって１ビット分の送信時間だけ遅延した光信号の位相と現在の光信号の位相に依存して、位相が同位相の場合には、光出力端子４０３からフォトダイオードＰＤ３にのみ光が入射し、逆位相の場合には光出力端子４０４からフォトダイオードＰＤ４にのみ光が入射する。フォトダイオードＰＤ３，ＰＤ４は光入力を電流に変換し、その電流値の差がトランスインピーダンス増幅器５０１に入力される。トランスインピーダンス増幅器５０１は、フォトダイオードＰＤ３，ＰＤ４の電流出力を増幅し、電圧出力に変換して出力端子５０６に出力する。こうした各部品の動作により、送信器で送出したデータを、出力端子５０６から得ることができる。 When a phase-modulated optical signal is incident on the optical input terminal 402 of the optical DPSK signal receiver, the optical signal delayed by the transmission time of 1 bit by the 1-bit delay unit 401 by the action of the Mach-Zehnder interferometer 400. Depending on the phase and the phase of the current optical signal, when the phase is the same, light enters only the photodiode PD3 from the light output terminal 403, and when the phase is opposite, the light is output from the light output terminal 404 to the photodiode. Light is incident only on PD4. The photodiodes PD3 and PD4 convert the optical input into a current, and the difference between the current values is input to the transimpedance amplifier 501. The transimpedance amplifier 501 amplifies the current output of the photodiodes PD3 and PD4, converts it into a voltage output, and outputs it to the output terminal 506. The data sent by the transmitter can be obtained from the output terminal 506 by the operation of each of these components.

T.J.Paul,et al.,“3 Gbit/s Optically Preamp1ified Direct Detection DPSK Receiver with 116 photon/bit Sensitivity”,IEE Electoronics letters Vol.29,No.7,pp.614-615,1993T.J.Paul, et al., “3 Gbit / s Optically Preamp1ified Direct Detection DPSK Receiver with 116 photon / bit Sensitivity”, IEE Electoronics letters Vol.29, No.7, pp.614-615,1993

今日の大容量光伝送装置では、波長多重（ＷＤＭ）が行なわれるため、伝送装置中に図１１に示す光ＤＰＳＫ信号受信器が波長多重された通信チャネルの数だけ備え付けられている。このため、伝送装置に用いられる部品は、一部の通信チャネル用の部品を交換する必要があった場合に、他の通信チャネルの動作を停止することなく、該当する部品の搭載されたボードのみを交換できる、活線挿抜に対応する必要がある。一般に、１枚のボードには異なる電圧値を設定した複数の電源が供給されているが、活線挿抜時には、いずれの電源から投入され、あるいはいずれの電源から停止されるのか、順番は保証されない。 In today's large-capacity optical transmission apparatus, wavelength multiplexing (WDM) is performed, and therefore, the optical DPSK signal receiver shown in FIG. 11 is provided in the transmission apparatus by the number of wavelength-multiplexed communication channels. For this reason, the parts used in the transmission device are only boards with the corresponding parts mounted without stopping the operation of other communication channels when it is necessary to replace parts for some communication channels. It is necessary to cope with hot-swapping. In general, a single board is supplied with a plurality of power supplies with different voltage values, but the order in which power is turned on or stopped is not guaranteed during hot-swap. .

ところが、図１１に示したような複数の電源端子を有する光ＤＰＳＫ信号受信器がボードに搭載されている場合には、電源投入・停止の順番によっては部品が破壊されることがあるため、ある一定の順番で電源が投入・停止されねばならない。このため、図１１に示したような複数の電源端子を有する部品を搭載するボードには、活線挿抜時に電源投入・停止の順番を制御する、シーケンサを備えることが必要となる。 However, when an optical DPSK signal receiver having a plurality of power supply terminals as shown in FIG. 11 is mounted on the board, parts may be destroyed depending on the order of power-on / stop. Power must be turned on and off in a certain order. For this reason, a board on which a component having a plurality of power supply terminals as shown in FIG. 11 is mounted must be equipped with a sequencer that controls the order of power on / off when hot-plugging.

しかしながら、シーケンサを備えると、ボードが大型化する上、消費電力も増加する。こうしたボードは、１つの伝送装置にＷＤＭで多重化された通信チャネルの数だけ備えられているので、光伝送装置の小型化・低消費電力化の障害になっている。 However, the provision of a sequencer increases the board size and power consumption. Such boards are provided as many as the number of communication channels multiplexed by WDM in one transmission apparatus, which is an obstacle to miniaturization and low power consumption of the optical transmission apparatus.

本発明は、こうした問題を解決するためになされたもので、ボード上にシーケンサを必要とせず、単体で活線挿抜に適応可能な光受信器を提供することを目的とする。 The present invention has been made to solve these problems, and it is an object of the present invention to provide an optical receiver that can be adapted for hot-line insertion and removal without requiring a sequencer on the board.

上記目的を達成するために、請求項１にかかる発明の光受信器は、第１の電源線に第１の極性端子が接続された第１および第２の光電変換手段と、前記第１の電源線と第２の電源線に接続されて動作し、前記第１の光電変換手段の第２の極性端子が非反転入力端子に接続され、前記第２の光電変換手段の第２の極性端子が反転入力端子に接続された差動トランスインピーダンス増幅器とを備え、前記第１および第２の光電変換手段の両端間に印加する電圧が、前記第１および第２の光電変換手段の推奨動作電圧内にあるようにしたことを特徴とする。
請求項２にかかる発明の光受信器は、第１の電源線に第１の極性端子が接続された第１および第２の光電変換手段と、前記第１の電源線に一端が接続された電圧調整手段と、前記電圧調整手段の他端と第２の電源線に接続されて動作し、前記第１の光電変換手段の第２の極性端子が非反転入力端子に接続され、前記第２の光電変換手段の第２の極性端子が反転入力端子に接続された差動トランスインピーダンス増幅器とを備え、前記第１および第２の光電変換手段の両端間に印加する電圧が、前記第１および第２の光電変換手段の推奨動作電圧内にあるようにしたことを特徴とする。
請求項３にかかる発明の光受信器は、第１の電源線に一端が接続された電圧調整手段と、前記電圧調整手段の他端に第１の極性端子が接続された第１および第２の光電変換手段と、前記第１の電源線と第２の電源線に接続されて動作し、前記第１の光電変換手段の第２の極性端子が非反転入力端子に接続され、前記第２の光電変換手段の第２の極性端子が反転入力端子に接続された差動トランスインピーダンス増幅器とを備え、前記第１および第２の光電変換手段の両端間に印加する電圧が、前記第１および第２の光電変換手段の推奨動作電圧内にあるようにしたことを特徴とする。
請求項４にかかる発明は、請求項３に記載の光受信器において、前記電圧調整手段に代えて、２個の電圧調整手段を用意し、一方の電圧調整手段と前記第１の光電変換手段を直列接続した第１の直列回路および他方の電圧調整手段と前記第２の光電変換手段を直列接続した第２の直列回路をそれぞれ構成し、前記第１の直列回路を前記第１の電源線と前記差動トランスインピーダンス増幅器の前記非反転入力端子との間に接続し、前記第２の直列回路を前記第１の電源線と前記差動トランスインピーダンス増幅器の前記反転入力端子との間に接続したことを特徴とする。
請求項５にかかる発明は、請求項２、３又は４に記載の光受信器において、前記電圧調整手段が前記差動トランスインピーダンス増幅器と集積化されていることを特徴とする
請求項６にかかる発明は、請求項２、３又は４に記載の光受信器において、前記電圧調整手段が前記第１および第２の光電変換手段と集積化されていることを特徴とする。
請求項７にかかる発明は、請求項２、３又は４に記載の光受信器において、前記第１および第２の光電変換手段と前記電圧調整手段と前記差動トランスインピーダンス増幅器が集積化されていることを特徴とする。
請求項８にかかる発明は、請求項１に記載の光受信器において、前記第１および第２の光電変換手段と前記差動トランスインピーダンス増幅器が集積化されていることを特徴とする。 In order to achieve the above object, an optical receiver according to a first aspect of the present invention comprises: first and second photoelectric conversion units each having a first polarity terminal connected to a first power supply line; The second polarity terminal of the second photoelectric conversion means is operated by being connected to the power supply line and the second power supply line, and the second polarity terminal of the first photoelectric conversion means is connected to the non-inverting input terminal. And a differential transimpedance amplifier connected to the inverting input terminal, and a voltage applied across the first and second photoelectric conversion means is a recommended operating voltage of the first and second photoelectric conversion means. It is characterized by being inside.
According to a second aspect of the present invention, there is provided an optical receiver comprising: first and second photoelectric conversion means having a first polarity terminal connected to a first power supply line; and one end connected to the first power supply line. The voltage adjusting means operates by being connected to the other end of the voltage adjusting means and a second power supply line, the second polarity terminal of the first photoelectric conversion means is connected to a non-inverting input terminal, and the second A differential transimpedance amplifier in which a second polarity terminal of the photoelectric conversion means is connected to an inverting input terminal, and a voltage applied between both ends of the first and second photoelectric conversion means is the first and second It is characterized in that it is within the recommended operating voltage of the second photoelectric conversion means.
According to a third aspect of the present invention, there is provided an optical receiver comprising: a voltage adjusting unit having one end connected to a first power line; and first and second terminals having a first polarity terminal connected to the other end of the voltage adjusting unit. The photoelectric conversion means and the first power supply line and the second power supply line connected to operate, the second polarity terminal of the first photoelectric conversion means is connected to a non-inverting input terminal, and the second A differential transimpedance amplifier in which a second polarity terminal of the photoelectric conversion means is connected to an inverting input terminal, and a voltage applied between both ends of the first and second photoelectric conversion means is the first and second It is characterized in that it is within the recommended operating voltage of the second photoelectric conversion means.
According to a fourth aspect of the present invention, in the optical receiver according to the third aspect, two voltage adjusting units are prepared instead of the voltage adjusting unit, and one voltage adjusting unit and the first photoelectric conversion unit are provided. And a second series circuit in which the other voltage adjusting means and the second photoelectric conversion means are connected in series, respectively, and the first series circuit is the first power line. And the non-inverting input terminal of the differential transimpedance amplifier, and the second series circuit is connected between the first power supply line and the inverting input terminal of the differential transimpedance amplifier. It is characterized by that.
The invention according to claim 5 is the optical receiver according to claim 2, 3 or 4, characterized in that the voltage adjusting means is integrated with the differential transimpedance amplifier. The invention is characterized in that in the optical receiver according to claim 2, 3 or 4, the voltage adjusting means is integrated with the first and second photoelectric conversion means.
According to a seventh aspect of the present invention, in the optical receiver according to the second, third, or fourth aspect, the first and second photoelectric conversion means, the voltage adjusting means, and the differential transimpedance amplifier are integrated. It is characterized by being.
The invention according to claim 8 is the optical receiver according to claim 1, characterized in that the first and second photoelectric conversion means and the differential transimpedance amplifier are integrated.

本発明によれば、光受信器の単一電源動作が可能になり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化することができる。 According to the present invention, a single power supply operation of an optical receiver becomes possible, and a sequencer for controlling the order of power on / off at the time of hot plugging / removing is not required, so the optical transmission apparatus can be reduced in size and reduced in power consumption. can do.

[第１の実施例]
図１は、本発明の第１の実施例の光受信器１００Ａを示す図である。同図において、２００は第１の電源線、３００は第２の電源線、１０１は差動トランスインピーダンス増幅器、１０２Ａ，１０２Ｂは差動出力端子、ＰＤ１,ＰＤ２は第１、第２のフォトダイオード、１０３,１０４は差動トランスインピーダンス増幅器１０１の第１、第２の電源端子、１０５はフォトダイオードＰＤ１，ＰＤ２の電源端子を表している。 [First embodiment]
FIG. 1 is a diagram showing an optical receiver 100A according to the first embodiment of the present invention. In the figure, 200 is a first power supply line, 300 is a second power supply line, 101 is a differential transimpedance amplifier, 102A and 102B are differential output terminals, PD1 and PD2 are first and second photodiodes, Reference numerals 103 and 104 denote first and second power supply terminals of the differential transimpedance amplifier 101, and reference numeral 105 denotes a power supply terminal of the photodiodes PD1 and PD2.

図７は差動トランスインピーダンス増幅器１０１の回路構成の例を示したものである。Ｑ１〜Ｑ４はバイポーラトランジスタ、Ｒ１〜Ｒ４は抵抗、Ｉ１〜Ｉ３は電流源、１０１１は差動増幅器、ＩＮＡ、ＩＮＢはフォトダイオードＰＤ１，ＰＤ２に接続される差動入力端子、ＯＵＴＡ，ＯＵＴＢは差動出力端子１０２Ａ，１０２Ｂに接続される差動出力端子である。同図では、バイポーラトランジスタによる構成例を示したが、電界効果型トランジスタでも同様の回路構成により差動トランスインピーダンス増幅器１０１を構成することができる。 FIG. 7 shows an example of the circuit configuration of the differential transimpedance amplifier 101. Q1 to Q4 are bipolar transistors, R1 to R4 are resistors, I1 to I3 are current sources, 1011 is a differential amplifier, INA and INB are differential input terminals connected to the photodiodes PD1 and PD2, and OUTA and OUTB are differential. It is a differential output terminal connected to the output terminals 102A and 102B. In the figure, a configuration example using bipolar transistors is shown, but the differential transimpedance amplifier 101 can be configured with a similar circuit configuration even with a field effect transistor.

フォトダイオードＰＤ１，ＰＤ２は光入力を電流に変換し、それぞれ差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢに入力する。差動トランスインピーダンス増幅器１０１は、電流入力の差を増幅し、電圧出力に変換して差動出力端子ＯＵＴＡ，ＯＵＴＢに出力する。 The photodiodes PD1 and PD2 convert the optical input into a current and input the current to the differential input terminals INA and INB of the differential transimpedance amplifier 101, respectively. The differential transimpedance amplifier 101 amplifies the difference between the current inputs, converts it into a voltage output, and outputs it to the differential output terminals OUTA and OUTB.

従って、図１１の光受信器５００の構成とは異なり、図１の光受信器１００Ａの構成では、フォトダイオードＰＤ１，ＰＤ２の同一極性端子が電源端子１０５に接続され、その出力の減算は差動トランスインピーダンス増幅器１０１の内部で行われる。また、このとき、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位は同一であるため、フォトダイオードＰＤ１，ＰＤ２の各電源端子は、電源端子１０５に共通化することができる。更に、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位と電源線２００の電位の差は、フォトダイオードＰＤ１，ＰＤ２の推奨動作電圧内にあるため、差動トランスインピーダンス増幅器１０１が電源端子１０３を介して直接接続されている電源線２００に、フォトダイオードＰＤ１，ＰＤ２の電源端子１０５を共通に接続することが可能となる。本実施例の光受信器１００Ａは、電源線２００と電源線３００のいずれかを光伝送装置の接地に接続し、他方の電源線にある一定の電圧を供給して動作されるため、単一電源で動作することが可能になる。 Therefore, unlike the configuration of the optical receiver 500 of FIG. 11, in the configuration of the optical receiver 100A of FIG. 1, the same polarity terminals of the photodiodes PD1 and PD2 are connected to the power supply terminal 105, and the output subtraction is differential. This is performed inside the transimpedance amplifier 101. At this time, since the DC potentials of the differential input terminals INA and INB of the differential transimpedance amplifier 101 are the same, the power terminals of the photodiodes PD1 and PD2 can be shared with the power terminal 105. Furthermore, since the difference between the DC potential of the differential input terminals INA and INB of the differential transimpedance amplifier 101 and the potential of the power supply line 200 is within the recommended operating voltage of the photodiodes PD1 and PD2, the differential transimpedance amplifier 101 It is possible to connect the power supply terminals 105 of the photodiodes PD1 and PD2 in common to the power supply line 200 that is directly connected via the power supply terminal 103. The optical receiver 100A of this embodiment is operated by connecting either the power supply line 200 or the power supply line 300 to the ground of the optical transmission apparatus and supplying a certain voltage to the other power supply line. It becomes possible to operate with a power supply.

このように、本実施例の光受信器１００Ａは、単一電源で動作し、２つ以上の電源電圧を必要としないため、活線挿抜時に電源投入・停止の順番を制御するシーケンサを光伝送装置に備える必要がなくなり、光伝送装置を小型化・低消費電力化する効果が得られる。 As described above, the optical receiver 100A according to the present embodiment operates with a single power supply and does not require two or more power supply voltages. Therefore, an optical transmission is performed by a sequencer that controls the order of power on / off during hot-swap. There is no need to provide the apparatus, and the effect of reducing the size and reducing the power consumption of the optical transmission apparatus can be obtained.

図２は、本発明の第１の実施例の光受信器１００Ａの変形例の光受信器１００Ｂを示す図である。符号が図１と共通であるものは説明を省略する。図１の光受信器器１００Ａでは、フォトダイオードの極性から明らかなように、電源線２００の電位をＶ１、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位をＶ２、電源線３００の電位をＶ３とすると、それらの間に、Ｖ１＞Ｖ２＞Ｖ３という関係がある。 FIG. 2 is a diagram illustrating an optical receiver 100B which is a modification of the optical receiver 100A according to the first embodiment of this invention. Description of the same reference numerals as those in FIG. 1 is omitted. In the optical receiver 100A of FIG. 1, as is apparent from the polarity of the photodiode, the potential of the power supply line 200 is V1, the DC potential of the differential input terminals INA and INB of the differential transimpedance amplifier 101 is V2, and the power supply line When the potential of 300 is V3, there is a relationship of V1> V2> V3 between them.

これに対し、図２の実施例の光受信器１００Ｂは、Ｖ３＞Ｖ２＞Ｖ１という関係がある場合の構成である。本実施例の光受信器１００Ｂにおいても、光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。 On the other hand, the optical receiver 100B of the embodiment of FIG. 2 has a configuration in the case where there is a relationship of V3> V2> V1. Also in the optical receiver 100B of this embodiment, it is obvious that the optical receiver operates with a single power source, and a sequencer for controlling the order of power on / off at the time of hot plugging / unplugging is not required. The effect of reducing the size and power consumption can be obtained.

[第２の実施例]
図３は、本発明の第２の実施例の光受信器１００Ｃを示す図である。同図において、１０６は電圧調整手段、１０７は電圧調整手段１０６を電源線２００に接続する電源端子であり、その他の符号は図１と共通であるため説明を省略する。本実施例の光受信器１００Ｃは、差動トランスインピーダンス増幅器１０１の電源端子１０３を直接に電源線２００に接続するように光受信器を構成すると、その電源線２００と差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位差が、フォトダイオードＰＤ１，ＰＤ２の推奨動作電圧範囲に満たない場合の構成である。 [Second embodiment]
FIG. 3 is a diagram showing an optical receiver 100C according to the second embodiment of the present invention. In the figure, reference numeral 106 denotes voltage adjusting means, 107 denotes a power supply terminal for connecting the voltage adjusting means 106 to the power supply line 200, and the other reference numerals are the same as those in FIG. When the optical receiver 100C of this embodiment is configured so that the power supply terminal 103 of the differential transimpedance amplifier 101 is directly connected to the power supply line 200, the power supply line 200 and the differential transimpedance amplifier 101 are connected to each other. In this configuration, the DC potential difference between the differential input terminals INA and INB is less than the recommended operating voltage range of the photodiodes PD1 and PD2.

本実施例の光受信器１００Ｃによれば、差動トランスインピーダンス増幅器１０１の電源端子１０３と電源線２００との間に電圧調整手段１０６を挿入するので、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位と電源線２００の電位との差を、フォトダイオードＰＤ１，ＰＤ２の推奨動作電圧内とすることができるため、フォトダイオードＰＤ１，ＰＤ２の電源端子１０５と電圧調整手段１０６の電源端子１０７を、電源線２００に共通に接続することが可能となる。 According to the optical receiver 100C of the present embodiment, since the voltage adjusting means 106 is inserted between the power supply terminal 103 of the differential transimpedance amplifier 101 and the power supply line 200, the differential input terminal of the differential transimpedance amplifier 101 is used. Since the difference between the DC potential of INA and INB and the potential of the power supply line 200 can be within the recommended operating voltage of the photodiodes PD1 and PD2, the power supply for the power supply terminals 105 and the voltage adjusting means 106 of the photodiodes PD1 and PD2 The terminal 107 can be connected to the power supply line 200 in common.

本実施例の光受信器１００Ｃにおいても、光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。 Also in the optical receiver 100C of this embodiment, it is obvious that the optical receiver operates with a single power source, and a sequencer for controlling the order of power on / off at the time of hot-swapping is not required. The effect of reducing the size and power consumption can be obtained.

なお、電圧調整手段１０６は、単純に抵抗で構成することもできるが、図８に示すようにダイオードＤ１〜Ｄ３による構成、図９に示すようにバイポーラトランジスタＱ５と抵抗Ｒ５，Ｒ６を用いた構成、あるいは図１０に示すように帰還回路を用いた構成などで実現することができる。図１０において、Ｑ６はバイポーラトランジスタ、Ｒ７〜Ｒ９は抵抗、ＤＺは定電圧ダイオード、１０６１は差動増幅器である。また、図１０に示すように、電圧調整手段１０６は電源線２００だけではなく、電源線３００への接続があってもよい。 The voltage adjusting means 106 can be simply constituted by a resistor, but a configuration using diodes D1 to D3 as shown in FIG. 8, and a configuration using bipolar transistor Q5 and resistors R5 and R6 as shown in FIG. Alternatively, it can be realized by a configuration using a feedback circuit as shown in FIG. In FIG. 10, Q6 is a bipolar transistor, R7 to R9 are resistors, DZ is a constant voltage diode, and 1061 is a differential amplifier. As shown in FIG. 10, the voltage adjusting means 106 may be connected not only to the power supply line 200 but also to the power supply line 300.

図４は、本発明の第２の実施例の光受信器１００Ｃの変形例の光受信器１００Ｄを示す図である。同図において、符号が図３と共通であるものは説明を省略する。図３の実施例の光受信器１００Ｃでは、図１の実施例の光受信器１００Ａと同様に、電源線２００の電位をＶ１、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位をＶ２、電源線３００の電位をＶ３とすると、それらの間に、Ｖ１＞Ｖ２＞Ｖ３という関係がある場合の構成であるが、図４の実施例は、Ｖ３＞Ｖ２＞Ｖ１という関係がある場合の構成である。本実施例の光受信器１００Ｄにおいても、光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。 FIG. 4 is a diagram illustrating an optical receiver 100D which is a modification of the optical receiver 100C according to the second embodiment of this invention. In the figure, those having the same reference numerals as those in FIG. In the optical receiver 100C of the embodiment of FIG. 3, as in the optical receiver 100A of the embodiment of FIG. 1, the potential of the power line 200 is V1, and the DC power of the differential input terminals INA and INB of the differential transimpedance amplifier 101 is set. 4 is a configuration in which the relationship of V1> V2> V3 is established between them, where V2> V3> V1, and the potential of the power supply line 300 is V3. In the embodiment of FIG. This is a configuration in some cases. Also in the optical receiver 100D of this embodiment, it is obvious that the optical receiver operates with a single power source, and a sequencer for controlling the order of power on / off at the time of hot plugging / unplugging is not required. The effect of reducing the size and power consumption can be obtained.

[第３の実施例]
図５は、本発明の第３の実施例の光受信器１００Ｅを示す図である。同図において、符号が図３と共通であるものは説明を省略する。本実施例は、差動トランスインピーダンス増幅器１０１の電源端子１０３を直接に電源線２００に接続するように光受信器を構成すると、電源線２００と差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位との差が、フォトダイオードＰＤ１，ＰＤ２の推奨動作電圧範囲を超過する場合の構成である。 [Third embodiment]
FIG. 5 is a diagram showing an optical receiver 100E according to the third embodiment of the present invention. In the figure, those having the same reference numerals as those in FIG. In this embodiment, when the optical receiver is configured such that the power supply terminal 103 of the differential transimpedance amplifier 101 is directly connected to the power supply line 200, the differential input terminals INA, In this configuration, the difference between the INB DC potential exceeds the recommended operating voltage range of the photodiodes PD1 and PD2.

本実施例の光受信器１００Ｅによれば、フォトダイオードＰＤ１，ＰＤ２の電源端子１０５と電源線２００との間に電圧調整手段１０６を挿入するので、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位と電源端子１０５の電位との差を、フォトダイオードＰＤ１，ＰＤ２の推奨動作電圧範囲内とすることができるため、差動トランスインピーダンス増幅器１０１の電源端子１０３と電圧調整手段１０６の電源端子１０７を、電源線２００に共通に接続することが可能となる。 According to the optical receiver 100E of the present embodiment, since the voltage adjusting means 106 is inserted between the power supply terminal 105 of the photodiodes PD1 and PD2 and the power supply line 200, the differential input terminal INA of the differential transimpedance amplifier 101 is inserted. , INB and the potential of the power supply terminal 105 can be within the recommended operating voltage range of the photodiodes PD1 and PD2, so that the power supply terminal 103 of the differential transimpedance amplifier 101 and the voltage adjustment means 106 The power supply terminal 107 can be connected to the power supply line 200 in common.

本実施例の光受信器１００Ｅにおいても、光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。なお、本実施例においては、フォトダイオードＰＤ１，ＰＤ２の共通電源端子１０５と電源線２００との間に電圧調整手段１０６を挿入したが、電圧調整手段を２個用いて、フォトダイオードＰＤ１，ＰＤ２のそれぞれに対して電圧調整手段を個々に挿入しても、同じ効果が得られることは明白である。この場合、フォトダイオードＰＤ１と第１の電圧調整手段の直列回路が電源線２００と差動トランスインピーダンス増幅器１０１の非反転入力端子ＩＮＡとの間に、フォトダイオードＰＤ２と第２の電圧調整手段の直列回路が電源線２００と差動トランスインピーダンス増幅器１０１の反転入力端子ＩＮＢとの間に、それぞれ接続される。 Also in the optical receiver 100E of this embodiment, it is obvious that the optical receiver operates with a single power source, and a sequencer for controlling the order of power on / off at the time of hot plugging / unplugging is not required. The effect of reducing the size and power consumption can be obtained. In this embodiment, the voltage adjusting means 106 is inserted between the common power supply terminal 105 of the photodiodes PD1 and PD2 and the power supply line 200. However, two voltage adjusting means are used to connect the photodiodes PD1 and PD2. It is clear that the same effect can be obtained even if the voltage adjusting means is inserted individually for each. In this case, a series circuit of the photodiode PD1 and the first voltage adjusting unit is connected between the power line 200 and the non-inverting input terminal INA of the differential transimpedance amplifier 101, and the photodiode PD2 and the second voltage adjusting unit are connected in series. A circuit is connected between the power line 200 and the inverting input terminal INB of the differential transimpedance amplifier 101, respectively.

図６は、本発明の第３の実施例の光受信器１００Ｅの変形例の光受信器１００Ｆを示す図である。同図において、符号が図５と共通であるものは説明を省略する。図５の実施例の光受信器１００Ｅでは、図１の実施例の光受信器１００Ａと同様に、電源線２００の電位をＶ１、差動トランスインピーダンス増幅器１０１の差動入力端子ＩＮＡ，ＩＮＢの直流電位をＶ２、電源線３００の電位をＶ３とすると、それらの間に、Ｖ１＞Ｖ２＞Ｖ３という関係がある場合の構成であるが、図６の実施例の光受信器１００Ｆは、Ｖ３＞Ｖ２＞Ｖ１という関係がある場合の構成である。本実施例の光受信器１００Ｆにおいても、光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。 FIG. 6 is a diagram illustrating an optical receiver 100F which is a modification of the optical receiver 100E according to the third embodiment of this invention. In the figure, those having the same reference numerals as those in FIG. In the optical receiver 100E of the embodiment of FIG. 5, as in the optical receiver 100A of the embodiment of FIG. 1, the potential of the power line 200 is V1, and the DC power of the differential input terminals INA and INB of the differential transimpedance amplifier 101 is set. 6 is a configuration in which there is a relationship of V1> V2> V3 between them, and the optical receiver 100F in the embodiment of FIG. This is a configuration when there is a relationship of> V1. Also in the optical receiver 100F of this embodiment, it is clear that the optical receiver operates with a single power source, and a sequencer for controlling the order of power on / off at the time of hot plugging / unplugging is not required. The effect of reducing the size and power consumption can be obtained.

なお、本実施例においても、フォトダイオードＰＤ１，ＰＤ２の共通電源端子１０５と電源線２００との間に電圧調整手段１０６を挿入しているが、電圧調整手段を２個用いて、フォトダイオードＰＤ１，ＰＤ２のそれぞれに対して電圧調整手段を個々に挿入しても、同じ効果が得られることは明白である。この場合、フォトダイオードＰＤ１と第１の電圧調整手段の直列回路が電源線２００と差動トランスインピーダンス増幅器１０１の非反転入力端子ＩＮＡとの間に、フォトダイオードＰＤ２と第２の電圧調整手段の直列回路が電源線２００と差動トランスインピーダンス増幅器１０１の反転入力端子ＩＮＢとの間に、それぞれ接続される。 In this embodiment, the voltage adjusting means 106 is inserted between the common power supply terminal 105 of the photodiodes PD1 and PD2 and the power supply line 200. However, two photodiodes PD1 and PD2 are used by using two voltage adjusting means. It is obvious that the same effect can be obtained even if the voltage adjusting means is individually inserted for each of the PDs 2. In this case, a series circuit of the photodiode PD1 and the first voltage adjusting unit is connected between the power line 200 and the non-inverting input terminal INA of the differential transimpedance amplifier 101, and the photodiode PD2 and the second voltage adjusting unit are connected in series. A circuit is connected between the power line 200 and the inverting input terminal INB of the differential transimpedance amplifier 101, respectively.

[第４の実施例]
本発明の第４の実施例の光受信器は、第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆにおいて、電圧調整手段１０６が差動トランスインピーダンス増幅器１０１と集積化される。電気的な構成は第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆと同一であるので、本実施例の光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。更に、そうした効果に加え、集積化による小型化・低消費電力化、実装部品点数の減少による低コスト化などの利点がある。 [Fourth embodiment]
In the optical receiver of the fourth embodiment of the present invention, the voltage adjusting means 106 is integrated with the differential transimpedance amplifier 101 in the optical receivers 100C to 100F of the second or third embodiment. Since the electrical configuration is the same as that of the optical receivers 100C to 100F of the second or third embodiment, it is obvious that the optical receiver of this embodiment operates with a single power source. Since a sequencer for controlling the turn-on / stop sequence is not necessary, the optical transmission apparatus can be reduced in size and power consumption can be obtained. In addition to these effects, there are advantages such as downsizing and low power consumption by integration, and cost reduction by reducing the number of mounted components.

[第５の実施例]
本発明の第５の実施例の光受信器は、第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆにおいて、電圧調整手段１０６がフォトダイオードＰＤ１，ＰＤ２と集積化される。電気的な構成は第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆと同一であるので、本実施例の光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。更に、そうした効果に加え、集積化による小型化・低消費電力化、実装部品点数の減少による低コスト化などの利点がある。本実施例においては、フォトダイオードＰＤ１，ＰＤ２、電圧調整手段１０６が同一チップに集積化されていてもよいし、２個のフォトダイオードＰＤ１，ＰＤ２が個別チップとなっている場合には、それぞれに対して電圧調整手段１０６を集積すればよい。 [Fifth embodiment]
In the optical receiver of the fifth embodiment of the present invention, the voltage adjusting means 106 is integrated with the photodiodes PD1 and PD2 in the optical receivers 100C to 100F of the second or third embodiment. Since the electrical configuration is the same as that of the optical receivers 100C to 100F of the second or third embodiment, it is obvious that the optical receiver of this embodiment operates with a single power source. Since a sequencer for controlling the turn-on / stop sequence is not necessary, the optical transmission apparatus can be reduced in size and power consumption can be obtained. In addition to these effects, there are advantages such as downsizing and low power consumption by integration, and cost reduction by reducing the number of mounted components. In the present embodiment, the photodiodes PD1 and PD2 and the voltage adjusting means 106 may be integrated on the same chip, and when the two photodiodes PD1 and PD2 are individual chips, respectively. On the other hand, the voltage adjusting means 106 may be integrated.

[第６の実施例]
本発明の第６の実施例の光受信器は、第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆにおいて、電圧調整手段１０６が２つのフォトダイオードＰＤ１，ＰＤ２および差動トランスインピーダンス増幅器１０１とともに集積化される。電気的な構成は第２あるいは第３の実施例の光受信器１００Ｃ〜１００Ｆと同一であるので、本実施例の光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。更に、そうした効果に加え、集積化による小型化・低消費電力化、実装部品点数の減少による低コスト化等の効果が著しいという利点がある。 [Sixth embodiment]
The optical receiver of the sixth embodiment of the present invention is the same as the optical receiver 100C to 100F of the second or third embodiment. The voltage adjusting means 106 includes two photodiodes PD1 and PD2 and a differential transimpedance amplifier 101. Integrated with it. Since the electrical configuration is the same as that of the optical receivers 100C to 100F of the second or third embodiment, it is obvious that the optical receiver of this embodiment operates with a single power source. Since a sequencer for controlling the turn-on / stop sequence is not necessary, the optical transmission apparatus can be reduced in size and power consumption can be obtained. Further, in addition to such effects, there is an advantage that effects such as downsizing and low power consumption by integration and cost reduction by reducing the number of mounted parts are remarkable.

[第７の実施例]
本発明の第７の実施例の光受信器は、第１の実施例の光受信器１００Ａ，１００Ｂにおいて、２つのフォトダイオードＰＤ１，ＰＤ２が差動トランスインピーダンス増幅器１０１とともに集積化される。電気的な構成は第１の実施例の受信器１００Ａ，１００Ｂと同一であるので、本発明の光受信器が単一電源で動作することは明白であり、活線挿抜時に電源投入・停止の順番を制御するシーケンサが不要となるため、光伝送装置を小型化・低消費電力化する効果が得られる。更に、そうした効果に加え、集積化による小型化・低消費電力化、実装部品点数の減少による低コスト化等の効果が著しいという利点がある。 [Seventh embodiment]
In the optical receiver of the seventh embodiment of the present invention, two photodiodes PD1 and PD2 are integrated with the differential transimpedance amplifier 101 in the optical receivers 100A and 100B of the first embodiment. Since the electrical configuration is the same as that of the receivers 100A and 100B of the first embodiment, it is clear that the optical receiver of the present invention operates with a single power source. Since a sequencer for controlling the order becomes unnecessary, the effect of reducing the size and reducing the power consumption of the optical transmission apparatus can be obtained. Further, in addition to such effects, there is an advantage that effects such as downsizing and low power consumption by integration and cost reduction by reducing the number of mounted parts are remarkable.

[他の実施例]
前記第４〜７の実施例において、電源線２００および電源線３００に接続するための電源端子は、集積回路中で共通になっていてもよいし、共通にせずに個別にボード上の電源線２００および電源線３００に接続しても良い。 [Other examples]
In the fourth to seventh embodiments, the power supply terminals for connecting to the power supply line 200 and the power supply line 300 may be common in the integrated circuit, or may not be shared, but individually on the board. 200 and the power line 300 may be connected.

また、前記第１〜７の実施例において、フォトダイオードＰＤ１，ＰＤ２は、通常使われるＰＩＮ型フォトダイオードに限らず、一般の光電気変換手段と置き換えることができる。例えば、アバランシェ・フォトダイオードやＭＳＭ受光素子、あるいはフォトトランジスタ等も利用できる。 In the first to seventh embodiments, the photodiodes PD1 and PD2 are not limited to commonly used PIN photodiodes, and can be replaced with general photoelectric conversion means. For example, an avalanche photodiode, an MSM light receiving element, a phototransistor, or the like can be used.

更に、前記第１〜７の実施例において、差動トランスインピーダンス増幅器１０１は、光受信器に要求される入力範囲において出力振幅が飽和しない線形増幅器でも良いし、出力振幅が飽和するリミツタ増幅器であってもよい。 Furthermore, in the first to seventh embodiments, the differential transimpedance amplifier 101 may be a linear amplifier whose output amplitude is not saturated in the input range required for the optical receiver, or a limiter amplifier whose output amplitude is saturated. May be.

更に、前記第１〜７の実施例において、差動トランスインピーダンス増幅器１０１の出力端子は、差動出力端子ＯＵＴＡ，ＯＵＴＢの両方を光受信器の出力端子１０２Ａ，１０２Ｂに取り出しているが、いずれか一方を適切に終端し、非反転出力のみ、あるいは反転出力のみを出力する構成にしても良い。 Further, in the first to seventh embodiments, the output terminal of the differential transimpedance amplifier 101 takes out both the differential output terminals OUTA and OUTB to the output terminals 102A and 102B of the optical receiver. One of them may be appropriately terminated and only non-inverted output or only inverted output may be output.

本発明の第１の実施例の光受信器の構成を示すブロック図である。It is a block diagram which shows the structure of the optical receiver of 1st Example of this invention. 本発明の第１の実施例の光受信器の変形例の構成を示すブロック図である。It is a block diagram which shows the structure of the modification of the optical receiver of 1st Example of this invention. 本発明の第２の実施例の光受信器の構成を示すブロック図である。It is a block diagram which shows the structure of the optical receiver of the 2nd Example of this invention. 本発明の第２の実施例の光受信器の変形例の構成を示すブロック図である。It is a block diagram which shows the structure of the modification of the optical receiver of the 2nd Example of this invention. 本発明の第３の実施例の光受信器の構成を示すブロック図である。It is a block diagram which shows the structure of the optical receiver of the 3rd Example of this invention. 本発明の第３の実施例の光受信器の変形例の構成を示すブロック図である。It is a block diagram which shows the structure of the modification of the optical receiver of the 3rd Example of this invention. 差動トランスインピーダンス増幅器１０１の構成を示す回路図である。2 is a circuit diagram showing a configuration of a differential transimpedance amplifier 101. FIG. 電圧調整手段１０６の構成例を示す回路図である。3 is a circuit diagram showing a configuration example of a voltage adjusting means 106. FIG. 電圧調整手段１０６の構成例を示す回路図である。3 is a circuit diagram showing a configuration example of a voltage adjusting means 106. FIG. 電圧調整手段１０６の構成例を示す回路図である。3 is a circuit diagram showing a configuration example of a voltage adjusting means 106. FIG. 従来の光受信器の構成を示すブロック図である。It is a block diagram which shows the structure of the conventional optical receiver.

Explanation of symbols

１００Ａ〜１００Ｆ：光受信器、１０１：差動トランスインピーダンス増幅器、１０２Ａ，１０２Ｂ：差動出力端子、１０３〜１０５：電源端子、１０６：電圧調整手段、１０７：電源端子
２００：電源線
３００：電源線
４００：マッハ−ツェンダ干渉計、４０１：１ビット遅延器、４０２：光入力端子、４０３：４０４：光出力端子
５００：光受信器、５０１：トランスインピーダンス増幅器、５０２〜５０５：電源端子、５０６：出力端子 100A to 100F: optical receivers, 101: differential transimpedance amplifiers, 102A and 102B: differential output terminals, 103 to 105: power supply terminals, 106: voltage adjusting means, 107: power supply terminals 200: power supply lines 300: power supply lines 400: Mach-Zehnder interferometer, 401: 1 bit delay device, 402: optical input terminal, 403: 404: optical output terminal 500: optical receiver, 501: transimpedance amplifier, 502 to 505: power supply terminal, 506: output Terminal

Claims

First and second photoelectric conversion means having a first polarity terminal connected to a first power supply line, connected to the first power supply line and the second power supply line and operated, and the first photoelectric conversion means A differential transimpedance amplifier having a second polarity terminal of the conversion means connected to a non-inverting input terminal and a second polarity terminal of the second photoelectric conversion means connected to an inverting input terminal; An optical receiver characterized in that a voltage applied between both ends of the first and second photoelectric conversion means is within a recommended operating voltage of the first and second photoelectric conversion means.

First and second photoelectric conversion means having a first polarity terminal connected to a first power supply line, voltage adjustment means having one end connected to the first power supply line, and the other end of the voltage adjustment means Connected to the second power supply line, the second polarity terminal of the first photoelectric conversion means is connected to the non-inverting input terminal, and the second polarity terminal of the second photoelectric conversion means is inverted. A differential transimpedance amplifier connected to the input terminal, and a voltage applied across the first and second photoelectric conversion means is within a recommended operating voltage of the first and second photoelectric conversion means. An optical receiver characterized by being provided.

Voltage adjusting means having one end connected to the first power supply line, first and second photoelectric conversion means having a first polarity terminal connected to the other end of the voltage adjusting means, and the first power supply line Connected to the second power supply line, the second polarity terminal of the first photoelectric conversion means is connected to the non-inverting input terminal, and the second polarity terminal of the second photoelectric conversion means is inverted. A differential transimpedance amplifier connected to the input terminal, and a voltage applied across the first and second photoelectric conversion means is within a recommended operating voltage of the first and second photoelectric conversion means. An optical receiver characterized by being provided.

The optical receiver according to claim 3.
Instead of the voltage adjusting means, two voltage adjusting means are prepared, and a first series circuit in which one voltage adjusting means and the first photoelectric conversion means are connected in series, the other voltage adjusting means, and the second A second series circuit in which the photoelectric conversion means are connected in series, and the first series circuit is connected between the first power line and the non-inverting input terminal of the differential transimpedance amplifier. An optical receiver in which the second series circuit is connected between the first power supply line and the inverting input terminal of the differential transimpedance amplifier.

The optical receiver according to claim 2, 3 or 4,
An optical receiver characterized in that the voltage adjusting means is integrated with the differential transimpedance amplifier.

The optical receiver according to claim 2, 3 or 4,
The optical receiver, wherein the voltage adjusting means is integrated with the first and second photoelectric conversion means.

The optical receiver according to claim 2, 3 or 4,
An optical receiver, wherein the first and second photoelectric conversion means, the voltage adjustment means, and the differential transimpedance amplifier are integrated.

The optical receiver according to claim 1.
An optical receiver characterized in that the first and second photoelectric conversion means and the differential transimpedance amplifier are integrated.