WO2017221880A1 - 光受信機 - Google Patents
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- WO2017221880A1 WO2017221880A1 PCT/JP2017/022503 JP2017022503W WO2017221880A1 WO 2017221880 A1 WO2017221880 A1 WO 2017221880A1 JP 2017022503 W JP2017022503 W JP 2017022503W WO 2017221880 A1 WO2017221880 A1 WO 2017221880A1
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- 230000003287 optical effect Effects 0.000 title claims abstract description 95
- 230000009977 dual effect Effects 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 238000010586 diagram Methods 0.000 description 21
- 230000001427 coherent effect Effects 0.000 description 15
- 230000010287 polarization Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010396 two-hybrid screening Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6972—Arrangements for reducing noise and distortion using passive filtering
Definitions
- the present invention relates to an optical receiver used in an optical communication network.
- optical communication networks short / medium-distance optical networks that transmit between cities at relatively short distances are also used for transmission within a data center, so there is a great demand for capacity expansion.
- the digital coherent optical communication system with a wide dynamic range has been mainly introduced in ultra-long distance optical communication due to its high dispersion tolerance and wide dynamic range, but with the downsizing and low cost of optical components, In recent years, application to shorter distances has been studied. In particular, if silicon photonics technology is used, optical transmitters and optical receivers can be significantly downsized and integrated, greatly contributing to the cost reduction of optical components at such relatively close distances. That is expected.
- FIG. 1 is an excerpt of FIG. 1 of Non-Patent Document 1 below.
- the conventional optical receiver shown in FIG. 1 receives a received signal in a dual polarization optical hybrid (Dual Polarization Optical Hybrid) composed of two hybrid mixers for X polarization (X-Pol) and Y polarization (Y-Pol).
- Light is demodulated by mixing the light (SIGNAL) with the reference light from the light source (LOCAL OSCILLATOR).
- the optical demodulated output becomes four demodulated lights for each of X polarization and Y polarization I and Q, and 4 to 8 dual photodiodes (PD) that use two photodiodes in close proximity to each other, It is converted into four pairs of electrical signals.
- the four pairs of demodulated electrical signals of the PD output are input to a four-channel transimpedance amplifier (TIA) and amplified.
- TIA four-channel transimpedance amplifier
- PD and TIA are usually composed of different chips because the semiconductor substrates are different. For this reason, it is necessary to connect the PD and TIA chips with electrical signal lines.
- the power of the eight photodiodes (PD) of the PD chip is independently supplied from the outside of the receiver.
- FIG. 2 shows the overall configuration of a general digital coherent optical transceiver by adding an optical transmitter to this optical receiver.
- the digital coherent optical transmitter / receiver 1 includes an optical receiver 2 and an optical transmitter 3.
- An input optical signal input to the optical receiver 2 is converted into an electric signal by a four-channel dual photodiode (PD) 5 through a dual-polarization optical hybrid 4 and is converted by a four-channel transimpedance amplifier (TIA) 6. Amplified and output as an input electrical signal.
- PD dual photodiode
- TIA transimpedance amplifier
- the output electrical signal input to the optical transmitter 3 is electrically amplified by the 4-channel driver 7, and the CW light is modulated by the 4-channel optical modulator 8 to become an output optical signal.
- FIG. 3 shows the entire four channels of the connection portion (PD-TIA connection portion) of the photodiode (PD, PD chip) 5 and the transimpedance amplifier (TIA, TIA chip) 6 of the conventional optical receiver 2. The configuration is shown. In FIG. 3, the outline of the circuit is shown for only one channel, but the other channels are similar circuits.
- Fig. 4 shows a detailed circuit diagram of the PD-TIA connection part of Fig. 3 for one channel.
- the input signal light is converted into a set of electric signals of two systems by two PDs (PD1, PD2) constituting a dual photodiode on the PD chip 5, and one-to-two signal lines IN, INC To the transimpedance amplifier (TIA) chip 6.
- PD1, PD2 the PDs constituting a dual photodiode on the PD chip 5
- TIA transimpedance amplifier
- the power supplies (VPD1, VPD2) of the two PDs constituting the dual photodiode are directly supplied to the respective PDs from the outside of the PD chip 5, Capacitors (C51, C52) were arranged.
- the power supply of the photodiode is supplied from the TIA chip 6 side, and the capacitor used for the power supply part of the photodiode is also integrated in the TIA chip 6 to greatly reduce the size. There is.
- an ordinary non-coherent optical receiver has a configuration shown in FIG.
- the power source of the photodiode (PD) 5 that is not of a dual configuration is supplied from the transimpedance amplifier (TIA) 6 side.
- FIG. 6 is a block diagram showing the entire four channels of this conventional PD-TIA connection unit.
- FIG. 7 is a circuit diagram of a PD-TIA connection unit for one channel when two PD power supplies are independent when supplying PD power from the TIA chip 6 (VPD1, VPD2).
- FIG. 8 is a circuit diagram of a PD-TIA connection unit for one channel when two PD power sources are shared (VPD).
- none of these prior art forms has a part for electromagnetically protecting the signal lines IN and INC of the PD-TIA connection part and its terminals.
- the PD output electric signal before amplification on the TIA input side is weak, it is easily affected by an external electromagnetic field and is affected by other receiving channels.
- the transmitter and receiver cannot be completely separated, and the distance between the two is also Since it is near, the influence which the electromagnetic wave which a transmitter emits on a receiver cannot be ignored.
- the electric signal lines and terminals inside the optical receiver are directly affected by the external electromagnetic field environment, resulting in deterioration of reception sensitivity and amplification noise resistance.
- the present invention is characterized by having the following configuration.
- An optical receiver having a PD chip having two photodiodes (PD) constituting a dual photodiode for each channel and a TIA chip having a transimpedance amplifier (TIA) corresponding to each channel, A signal line connecting the PD chip and the TIA chip is surrounded by a conductive pattern not connected to the signal line for each channel, and the conductive pattern is a ground pattern of the TIA chip or a PD Connected to the power pattern
- PD chip having two photodiodes (PD) constituting a dual photodiode for each channel and a TIA chip having a transimpedance amplifier (TIA) corresponding to each channel
- a signal line connecting the PD chip and the TIA chip is surrounded by a conductive pattern not connected to the signal line for each channel, and the conductive pattern is a ground pattern of the TIA chip or a PD Connected to the power pattern
- the conductive patterns are two independent conductive patterns corresponding to the two PDs for each channel, and are independently connected to the TIA chip and capacitively coupled to the ground pattern in the TIA chip. ing, An optical receiver according to the first aspect of the invention.
- the two PDs constituting the dual photodiode are connected with their cathodes facing each other, and the cathode connection point is connected to the PD power pattern of the TIA chip, Two signal lines are drawn out from the two anodes of the two PDs and input to the TIA chip, From the cathode connection point, the conductive pattern branches so as to surround the two PDs toward the outer peripheral side of the PD chip, and as two PD power supply patterns from a position sandwiching the two signal lines. Pulled out and connected to the PD power pattern of the TIA chip, The PD power pattern of the TIA chip is grounded at a high frequency by a capacitor of the TIA chip, An optical receiver according to the first aspect of the invention.
- the two PDs constituting the dual photodiode are arranged so that their anodes are opposed to each other, two signal lines are drawn from both anodes, and input to the TIA chip,
- the conductive pattern connects the cathodes of the two PDs on the outer peripheral side of the PD chip, branches off on the outer peripheral side, and is drawn out from a position sandwiching the two signal lines, and then the PD of the TIA chip Connected to the power pattern,
- the PD power pattern of the TIA chip is grounded at a high frequency by a capacitor of the TIA chip,
- the optical receiver according to claim 1.
- the two PDs constituting the dual photodiode are arranged so that their anodes are opposed to each other, two signal lines are drawn from both anodes, and input to the TIA chip,
- the conductive pattern connects the cathodes of the two PDs on the outer peripheral side of the PD chip in an AC manner via a capacitor, branches off on the outer peripheral side, and is pulled out from a position sandwiching the two signal lines.
- the two PD power patterns of the TIA chip are grounded in high frequency by two capacitors of the TIA chip, respectively.
- the optical receiver is affected by these noises as much as possible. It is possible to configure so that there is no.
- FIG. 4 is a detailed circuit diagram for one channel in the PD-TIA connection unit of FIG. 3. It is a schematic diagram of the PD-TIA connection part when supplying PD power from TIA according to the prior art. In the prior art, it is a block diagram showing the whole four channels of the PD-TIA connection part of the coherent optical receiver when supplying PD power from TIA.
- FIG. 4 is a detailed circuit diagram for one channel in the PD-TIA connection unit of FIG. 3. It is a schematic diagram of the PD-TIA connection part when supplying PD power from TIA according to the prior art. In the prior art, it is a block diagram showing the whole four channels of the PD-TIA connection part of the coherent optical receiver when supplying PD power from TIA.
- FIG. 6 is a circuit diagram of a PD-TIA connection unit for one channel when two PD power supplies are independent when supplying PD power from a TIA in the prior art.
- FIG. 6 is a circuit diagram of a PD-TIA connection portion for one channel when two PD power sources are shared when supplying PD power from a TIA in the prior art.
- It is an example of the circuit diagram for 1 channel of the PD-TIA connection part of the optical receiver by 1st Embodiment of this invention.
- It is another example of the circuit diagram of PD-TIA connection part of the optical receiver by 1st Embodiment of this invention.
- It is an example of the circuit diagram of the PD-TIA connection part of the optical receiver by 2nd Embodiment of this invention.
- It is another example of the circuit diagram of the PD-TIA connection part of the optical receiver by 2nd Embodiment of this invention.
- FIG. 9 is a circuit diagram showing one channel of the PD-TIA connection unit of the optical receiver according to the first embodiment of the present invention. This figure shows the connection between a 4-channel dual photodiode (PD) chip 5 and a 4-channel transimpedance amplifier (TIA) chip 6 (PD-TIA connection) in the conventional digital coherent optical transceiver shown in FIG. 2 is a circuit diagram corresponding to one channel.
- PD dual photodiode
- TIA transimpedance amplifier
- a PD-TIA connection is used to connect a PD chip 5 on which PDs (PD1, PD2) having a dual photodiode configuration for multiple channels and a TIA chip 6 on which a transimpedance amplifier (TIA) for the same number of channels is mounted.
- PDs PD1, PD2
- TIA transimpedance amplifier
- the signal lines (IN, INC) of each channel are surrounded by PD power lines (PD power patterns) VPD for PD that supply power from the TIA chip 6 to the PD chip 5.
- the description of the symbol of the TIA amplifier itself is omitted.
- two PDs (PD1, PD2) having a dual photodiode configuration for one channel mounted on the PD chip 5 are connected with their cathodes facing each other, and the cathode connection point is the PD. It is drawn from the chip 5 and connected to the PD power line (PD power pattern) VPD of the TIA chip 6.
- signal lines IN and INC are drawn out from the two anodes of the two PDs (PD1, PD2) in the dual photodiode configuration and input to the TIA chip 6.
- the PD power line branches from the cathode connection point so as to surround the two PDs toward the outer peripheral side of the PD chip 5, and the two PD power lines sandwich the terminals of the signal lines IN and INC. It is pulled out from the terminal at the position and connected to the PD power line VPD of the TIA chip 6.
- the PD power line VPD is grounded and stabilized at a high frequency by the capacitor C60 of the TIA chip 6.
- These PD power supply lines are usually formed on a substrate as a conductive metal thin film pattern as a circuit mounting form, and can be referred to as a power supply pattern or a conductive pattern. Due to this conductive pattern, most of the external electromagnetic waves emitted from adjacent channels and transmitters are not directly input to the signal lines IN, INC and signal terminals from the photodiode, but the surrounding PD power supply pattern VPD and Shielded by power terminals.
- FIG. 10 is another example of a circuit diagram corresponding to one channel of the PD-TIA connection unit of the optical receiver according to the first embodiment of the present invention.
- a signal line IN, INC from the PD chip 5 is surrounded by a ground line (ground pattern) instead of the PD power supply line VPD, and this is connected to the ground pattern of the TIA chip 6.
- the two photodiodes (PD1, PD2) of the dual photodiode configuration mounted on the PD chip 5 are connected with their cathodes facing each other, and the cathode connection point is drawn from the PD chip 5. It is connected to the PD power line VPD of the TIA chip 6.
- signal lines IN and INC are drawn out from the two anodes of the two PDs (PD1, PD2) in the dual photodiode configuration and input to the TIA chip 6.
- the conductive pattern branches from the cathode connection point to the outer peripheral side of the PD chip 5 via the capacitor C50 so as to surround the two PDs, and sandwiches the terminals of the signal lines IN and INC.
- Two ground lines are drawn from the terminal and connected to the ground line of the TIA chip 6.
- the PD power line VPD is grounded and stabilized at high frequency by the capacitor C60 of the TIA chip 6 and the capacitor C50 of the PD chip 5.
- ground lines like the PD power lines, are usually formed on the substrate as conductive metal thin film patterns as a circuit mounting form, and can be referred to as a ground pattern or a conductive pattern.
- a ground pattern With this conductive pattern, most of the external electromagnetic waves emitted from adjacent channels and transmitters are shielded by the surrounding ground pattern without being directly input to the signal terminals such as signal lines IN and INC from the photodiode. Is done.
- FIG. 11 is a circuit diagram for one channel of the PD-TIA connection unit of the optical receiver according to the second embodiment of the present invention.
- the PD power line terminal is not provided between the two signal lines IN and INC from the photodiode, and the photodiode and the two signal lines IN and INC are surrounded.
- the PD power line VPD is arranged outside.
- the two PDs (PD1, PD2) of the dual photodiode configuration mounted on the PD chip 5 are arranged with their anodes facing each other, and the signal lines IN and INC are drawn from both anodes. And input to the TIA chip 6.
- a conductive pattern connects the cathodes of the two PDs on the outer peripheral side of the PD chip 5, branches on the outer peripheral side, and is led out from the terminal at the position sandwiching the terminals of the signal lines IN and INC, and the TIA chip 6 Connected to the PD power line VPD.
- the PD power line VPD is grounded and stabilized in terms of high frequency by the capacitor C60 of the TIA chip 6.
- FIG. 12 shows another example of the circuit diagram of the second embodiment of the present invention.
- the two PD power supplies (VPD1, VPD2) that make up the dual photodiode for each channel are taken independently, and two systems are provided outside the photodiodes (PD1, PD2) and the two signal lines IN, INC.
- PD power lines VPD1 and VPD2 are arranged. With this configuration, it is possible to independently monitor the photocurrent flowing through each photodiode.
- a capacitor C53 is provided that separates the cathodes of two PDs (PD1, PD2) to be dual photodiodes in a direct current manner and connects them in high frequency.
- the two photodiodes (PD1, PD2) of the dual photodiode configuration mounted on the PD chip 5 are arranged with their anodes facing each other, and the signal lines IN and INC are drawn from both anodes. Are input to the TIA chip 6.
- a conductive pattern connects the cathodes of the two PDs on the outer peripheral side of the PD chip 5 in an alternating manner via a capacitor C53.
- the conductive patterns are branched from the cathodes of the two PDs on the outer peripheral side, and are drawn out from the terminals on both sides of the signal lines IN and INC between the PD power lines VPD1, Each is connected to VPD2.
- the PD power lines VPD1 and VPD2 are grounded and stabilized in high frequency by the two capacitors C61 and C62 of the TIA chip 6, respectively.
- the capacitor C53 of the PD chip 5 has an effect of stabilizing when the balance between the left and right PD power supply lines VPD1 and VPD2 is lost.
- the present invention is naturally applicable to a configuration of a plurality of channels other than four. Further, it is clear that even a one-channel configuration has a shielding effect against electromagnetic waves generated from a transmitter inside the optical transceiver.
- the present invention provides an optical receiver having a connection part (PD-TIA connection part) of a PD chip having dual photodiodes for one or more channels and a TIA chip having transimpedance amplifiers for the same number of channels. Is also applicable.
- an example of an optical receiver in the digital coherent optical communication system has been shown, but the present invention is not limited to this system but can be applied to any optical receiver using a dual photodiode and a transimpedance amplifier. Is possible. Further, in the transmitter / receiver in which the transmitter is integrated, the effect of the present invention is further increased because the influence of crosstalk from the transmitter is added in addition to the adjacent channel.
- the optical receiver even when high noise is generated inside an optical transmitter / receiver in which the optical transmitter is built in the same housing as the optical receiver, the optical receiver It is possible to configure an optical transceiver in which the signal line is shielded so as not to be affected by these noises as much as possible.
Abstract
Description
各チャネル毎にそれぞれデュアルフォトダイオードを構成する2つのフォトダイオード(PD)を搭載するPDチップと、各チャネルに対応するトランスインピーダンスアンプ(TIA)を搭載するTIAチップを有する光受信機であって、
前記PDチップと前記TIAチップを接続する信号線が、各チャネル毎にそれぞれ信号線と接続されていない導電性パタンで囲まれていて、これら導電性パタンは、前記TIAチップのグランドパタン、もしくはPD用の電源パタンに接続されている
ことを特徴とする光受信機。
前記導電性パタンは各チャネル毎にそれぞれ2つの前記PDに対応して独立な2つの導電性パタンであって、独立に前記TIAチップに接続され、前記TIAチップ内でそれぞれグランドパタンに容量結合されている、
ことを特徴とする発明の構成1記載の光受信機。
前記デュアルフォトダイオードを構成する2つの前記PDは、そのカソードが対向して接続され、該カソード接続点は前記TIAチップのPD電源パタンに接続されており、
2つの前記PDの2つのアノードからは、2本の信号線が引き出されて、前記TIAチップに入力されており、
前記カソード接続点からは前記導電性パタンが、前記PDチップの外周側に向かって2つの前記PDを囲むように分岐して、2本の前記信号線を挟む位置から2本のPD電源パタンとして引き出されて、前記TIAチップのPD電源パタンに接続されており、
前記TIAチップの前記PD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする発明の構成1記載の光受信機。
前記デュアルフォトダイオードを構成する2つの前記PDは、そのカソードが対向して接続され、該カソード接続点は前記TIAチップのPD電源パタンに接続されており、
2つの前記PDの2つのアノードからは、2本の信号線が引き出されて、前記TIAチップに入力されており、
前記カソード接続点からは前記導電性パタンが、コンデンサを介して前記PDチップの外周側に向かって2つの前記PDを囲むように分岐して、2本の前記信号線を挟む位置から2本のグランドパタンとして引き出されて、前記TIAチップのグランドパタンに接続されており、
前記TIAチップのPD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする発明の構成1記載の光受信機。
(発明の構成5)
前記デュアルフォトダイオードを構成する2つの前記PDは、そのアノードが対向して配置され、両アノードから2本の信号線が引き出されて、前記TIAチップに入力されており、
前記導電性パタンは、2つの前記PDのカソードを前記PDチップの外周側で接続するとともに、それぞれ外周側で分岐して、2本の前記信号線を挟む位置から引き出されて前記TIAチップのPD電源パタンに接続されており、
前記TIAチップの前記PD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする請求項1記載の光受信機。
前記デュアルフォトダイオードを構成する2つの前記PDは、そのアノードが対向して配置され、両アノードから2本の信号線が引き出されて、前記TIAチップに入力されており、
前記導電性パタンは、2つの前記PDのカソードを前記PDチップの外周側でコンデンサを介して交流的に接続するとともに、それぞれ外周側で分岐して、2本の前記信号線を挟む位置から引き出されて前記TIAチップの2つのPD電源パタンにそれぞれ接続されており、
前記TIAチップの2つの前記PD電源パタンは前記TIAチップの2つのコンデンサによってそれぞれ高周波的に接地されている、
ことを特徴とする発明の構成2記載の光受信機。
図9は、本発明の第1実施形態による光受信機の、PD-TIA接続部の1チャネル分を表す回路図である。この図は、図2に示される従来のディジタルコヒーレント光送受信機において、4チャネルのデュアルフォトダイオード(PD)チップ5と、4チャネルのトランスインピーダンスアンプ(TIA)チップ6の接続部(PD-TIA接続部)の1チャネル分にあたる回路図である。
図10は、本発明の第1実施形態による光受信機の、PD-TIA接続部の1チャネル分にあたる回路図の別の例である。この例は、PD電源線VPDの代わりにグランド線(グランドパタン)でPDチップ5からの信号線IN, INCを囲い、これをTIAチップ6のグランドパタンに接続した場合の回路図である。
図11は、本発明の第2実施形態による光受信機のPD-TIA接続部の1チャネル分の回路図である。
図12には、本発明の第2実施形態の回路図の別の例を示す。この例では、各チャネル毎にデュアルフォトダイオードを構成する2つのPDの電源(VPD1,VPD2)を独立にとり、フォトダイオード(PD1,PD2)および2つの信号線IN,INCを囲む外側に、2系統のPD電源線VPD1,VPD2を配置する。この構成によって、それぞれのフォトダイオードを流れる光電流を独立にモニタすることが可能である。
2 光受信機
3 光送信機
4 二重偏波光ハイブリッド
5 デュアルフォトダイオード(PD、PDチップ)
6 トランスインピーダンスアンプ(TIA、TIAチップ)
7 ドライバ
8 光変調器
PD1,PD2 フォトダイオード
C50~C53、C60~C62 コンデンサ
VPD、VPD1、VPD2 PD電源線(PD電源パタン)
IN、INC 信号線
Claims (6)
- 各チャネル毎にそれぞれデュアルフォトダイオードを構成する2つのフォトダイオード(PD)を搭載するPDチップと、各チャネルに対応するトランスインピーダンスアンプ(TIA)を搭載するTIAチップを有する光受信機であって、
前記PDチップと前記TIAチップを接続する信号線が、各チャネル毎にそれぞれ信号線と接続されていない導電性パタンで囲まれていて、これら導電性パタンは、前記TIAチップのグランドパタン、もしくはPD用の電源パタンに接続されている
ことを特徴とする光受信機。 - 前記導電性パタンは各チャネル毎にそれぞれ2つの前記PDに対応して独立な2つの導電性パタンであって、独立に前記TIAチップに接続され、前記TIAチップ内でそれぞれグランドパタンに容量結合されている、
ことを特徴とする請求項1記載の光受信機。 - 前記デュアルフォトダイオードを構成する2つの前記PDは、そのカソードが対向して接続され、該カソード接続点は前記TIAチップのPD電源パタンに接続されており、
2つの前記PDの2つのアノードからは、2本の信号線が引き出されて、前記TIAチップに入力されており、
前記カソード接続点からは前記導電性パタンが、前記PDチップの外周側に向かって2つの前記PDを囲むように分岐して、2本の前記信号線を挟む位置から2本のPD電源パタンとして引き出されて、前記TIAチップのPD電源パタンに接続されており、
前記TIAチップの前記PD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする請求項1記載の光受信機。 - 前記デュアルフォトダイオードを構成する2つの前記PDは、そのカソードが対向して接続され、該カソード接続点は前記TIAチップのPD電源パタンに接続されており、
2つの前記PDの2つのアノードからは、2本の信号線が引き出されて、前記TIAチップに入力されており、
前記カソード接続点からは前記導電性パタンが、コンデンサを介して前記PDチップの外周側に向かって2つの前記PDを囲むように分岐して、2本の前記信号線を挟む位置から2本のグランドパタンとして引き出されて、前記TIAチップのグランドパタンに接続されており、
前記TIAチップのPD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする請求項1記載の光受信機。 - 前記デュアルフォトダイオードを構成する2つの前記PDは、そのアノードが対向して配置され、両アノードから2本の信号線が引き出されて、前記TIAチップに入力されており、
前記導電性パタンは、2つの前記PDのカソードを前記PDチップの外周側で接続するとともに、それぞれ外周側で分岐して、2本の前記信号線を挟む位置から引き出されて前記TIAチップのPD電源パタンに接続されており、
前記TIAチップの前記PD電源パタンは前記TIAチップのコンデンサによって高周波的に接地されている、
ことを特徴とする請求項1記載の光受信機。 - 前記デュアルフォトダイオードを構成する2つの前記PDは、そのアノードが対向して配置され、両アノードから2本の信号線が引き出されて、前記TIAチップに入力されており、
前記導電性パタンは、2つの前記PDのカソードを前記PDチップの外周側でコンデンサを介して交流的に接続するとともに、それぞれ外周側で分岐して、2本の前記信号線を挟む位置から引き出されて前記TIAチップの2つのPD電源パタンにそれぞれ接続されており、
前記TIAチップの2つの前記PD電源パタンは前記TIAチップの2つのコンデンサによってそれぞれ高周波的に接地されている、
ことを特徴とする請求項2記載の光受信機。
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