WO2016006047A1

WO2016006047A1 - Optical reception module

Info

Publication number: WO2016006047A1
Application number: PCT/JP2014/068246
Authority: WO
Inventors: 寛樹山下; 享史竹本; 康信松岡
Original assignee: 株式会社日立製作所
Priority date: 2014-07-09
Filing date: 2014-07-09
Publication date: 2016-01-14

Abstract

The present invention achieves transmission having high transmission waveform qualities by reducing random jitter generated in an optical transmission module. Disclosed is an optical reception module wherein: a transition current of a current signal transmitted from a photodiode is detected; the transition current is added during time when the current signal is transiting; a start-up time of a current waveform is improved; and random jitter due to noise in the amplitude direction is reduced, said noise having been generated in a laser diode of a transmission module.

Description

Optical receiver module

The present invention relates to an optical receiver module, and more particularly to an optical communication module and an optical communication apparatus including the same, and more particularly to an optical communication apparatus such as a router and a server, and one of its components, using a laser diode and a photodiode. The present invention relates to a receiving module, a receiving circuit, and a receiving method that are effective when applied to an optical communication module that performs optical communication.

In recent years, with the increase in capacity of multimedia contents due to the spread of smartphones and tablet terminals, for example, the communication speed between boards in information communication devices such as router devices and server devices is required from 10 Gbps to 25 Gbps and 50 Gbps. Along with this, in the electric transmission technology that has been applied to the inter-board communication in the apparatus so far, even if the communication distance is about 1 m, if the communication speed exceeds 20 Gbps, transmission becomes difficult due to an increase in transmission loss and reflection noise. . For this reason, the application of optical transmission technology using an optical fiber cable with high transmission loss and low reflection is proposed for communication between boards within the apparatus, which has a relatively short communication distance of about 1 m. For example, Patent Document 1 describes a laser diode driver circuit in which a pre-emphasis circuit is provided in a high-speed optical transmission circuit. This circuit realizes high-speed transmission by shortening the high-speed driving of the laser diode and the rise / fall time of the optical signal. Non-Patent Document 1 describes an optical receiver circuit that realizes 25 Gbps optical communication, and Non-Patent Document 2 describes an optical transceiver that realizes 35 Gbps optical communication.

JP 2012-43933 A

Fig. 10 shows an example of the basic configuration and optical transmission waveform when the optical transmission technology is applied to inter-board communication. (a) shows the basic configuration and (b) shows an example of the output eye waveform of the transmission optical module. This optical transmission system is composed of a transmission optical module Tx composed of a laser driver LDD and a laser diode LD, an optical fiber FI connecting the boards with light, and a reception optical module composed of a photodiode PD and a transimpedance amplifier TIA. In the communication between the transmission S_LSI of the transmission board in the communication device and the R_LSI of the reception board, the electrical signal from the transmission S_LSI is converted into an optical signal by the transmission optical module Tx and transmitted through the optical fiber between the transmission / reception boards. The signal is restored to an electrical signal by the receiving optical module and transmitted to the receiving R_LSI. By adopting this configuration, it is possible to shorten the electrical transmission path between the transmission / reception LSI and the transmission / reception optical module, and therefore it is possible to prevent deterioration in transmission quality at the electrical transmission portion. Therefore, the transmission quality in this transmission system greatly affects the quality of the optical transmission waveform between the transmission and reception modules. The transmission quality of the optical waveform is defined by the time width in which data is determined, that is, the eye opening width, as shown in FIG. 10B as an example of a 25 Gbps optical eye waveform, and can be transmitted with the size of this opening width. Whether it is determined. For normal signal transmission, an eye opening of approximately 30% or more of 40 ps is generally required at 25 Gbps. The cause of reducing the eye opening width of the optical waveform is dominated by random jitter caused by spontaneous emission noise called relative intensity noise (RIN: Relative Intensity Noise) of the laser diode LD. FIG. 11 shows a state in which relative intensity noise generated by a surface emitting laser VCSEL as a direct modulation laser diode is superimposed on a modulated output light waveform. The relative intensity noise RIN_OMA is an index representing a ratio to the spontaneous emission noise with respect to the modulation power P_OMA. Here, P_OMA is modulation power, Pn is spontaneous emission noise, and BW is noise bandwidth. In general VCSEL, the value of RIN_OMA is about 130 dB / Hz to 140 dB / Hz, and this value is almost constant even if the performance of VCSEL is improved. The problem here is that the band that must be considered when the bit rate is increased increases the noise, and the random jitter due to the noise increases. FIG. 12 shows the relationship between the noise RIN_OMA and the random jitter RJ_RIN. (A) shows a calculation formula representing the relationship between RIN_OMA and jitter, and (b) shows an example comparing the calculation formula with the actual measurement result. As shown in FIG. 12A, for example, when relative intensity noise Pn having a frequency component equal to or lower than the fundamental frequency of the communication speed (bit rate) is generated on the positive side, the optical output waveform moves to the positive side. Thus, the time to cut the center of the output waveform is accelerated by RJ_RIN, which becomes the random jitter RJ_RIN. Note that the fundamental frequency is 12.5 GHz when the communication speed, that is, the bit rate is 25 Gbps. As shown in FIG. 12B, it can be understood that the relationship between the relative intensity noise and the random jitter RI_RIN can be calculated with this concept. Therefore, the random jitter due to RIN_OMA is determined by the rise time Trf of the output waveform and the noise band BW in addition to the relative intensity noise Pn and the modulation power P_OMA. In particular, in order to reduce the random jitter RJ_RIN due to the relative intensity noise RIN_OMA, two methods of increasing the modulation power P_OMA, that is, increasing the extinction ratio ER, and shortening the rise time of the output waveform are conceivable. However, since the former method cannot output modulation power above a certain level (approximately 3mW or more), especially with the surface emitting laser VCSEL used for inter-board communication, this method reduces random jitter RJ_RIN. Is not effective. For this reason, conventionally, as a method of shortening the rise time of the latter output waveform, the method of Patent Document 1 performed by a transmission module has been adopted.

Referring to FIG. 13, the basic configuration of the LD driver disclosed in Patent Document 1 is shown in FIG. 13 (a), and the idea of shortening the rise time, its effects, and problems are described in (b). The LD driver includes a driver circuit that drives a laser diode LD, a driver that drives the LD, a delay circuit, two prebuffers, and a waveform adder.

In the LD driver, the output waveform (B) of the sub-predriver with a certain delay, which is a delay circuit, is added to the output waveform (A) of the main predriver, and the laser diode LD is connected to the driver circuit using this added waveform as an input. By driving, the rise time of the optical output waveform of the laser diode LD is shortened. Specifically, as shown in FIG. 13B, the output waveform of the laser diode is a waveform obtained by subtracting the response of the output waveform (B) of the sub-prebuffer from the response to the output waveform (A) of the main prebuffer. Will be output. As a result, the optical output waveform of the laser diode LD is greatly shortened with respect to the response waveform of the output waveform (A) of the main driver. On the other hand, since the subtraction is performed with the output waveform (B) of the prebuffer, the output amplitude decreases. For example, if the rise time is shortened by about 30%, the output amplitude is reduced by 30%. In this method performed by the transmission module, the power modulation by the sub-prebuffer increases and the output modulation amplitude decreases.

The present invention has been made in view of the above, and it is an object of the present invention to increase the communication speed without causing a decrease in modulation power or an increase in power in the transmission module. An object of the present invention is to provide an optical receiving circuit and a receiving optical module capable of reducing random jitter generated in a module and realizing transmission with high transmission waveform quality.

A photodiode that receives an optical signal from a transmission module and converts it into a current signal, and a transimpedance amplifier that converts the current signal of the photodiode into a voltage signal and outputs the voltage signal. A transition current detecting means for detecting a transition of the current signal and outputting a transition current only during the time when the current signal is transitioned; a means for adding the transition current to the current signal of the photodiode within the transition time; A transimpedance amplifier that converts and amplifies a current signal to which a transition current is added into a voltage signal is provided.

Briefly explaining the effect obtained by the embodiment of the present application, the rise time of the current waveform is shortened by adding the transition current component of this current waveform to the current waveform converted by the photodiode from the received optical waveform. Thus, random jitter of the optical waveform generated in the transmission module can be reduced, and transmission with high transmission quality can be realized.

It is a block diagram which shows an example of a structure of the optical receiver module by Embodiment 1 of this invention. It is a block diagram which shows one specific structural example of the detection means and addition means of the transition current in FIG. It is a block diagram which shows the example of another concrete one of the detection means and addition means of a transition current in FIG. FIG. 10 is a circuit diagram illustrating an example of a specific circuit configuration in which a transition current adding unit is provided at the output of a threshold voltage detection circuit that is a part of a transimpedance amplifier in the optical receiver module according to Embodiment 2 of the present invention. FIG. 5 is a circuit diagram showing an example of a specific circuit configuration in which transition current addition means is provided in a preamplifier circuit that is a part of a transimpedance amplifier in the optical receiver module according to Embodiment 1 of the present invention. FIG. 10 is a circuit diagram illustrating an example of a specific circuit configuration in which a transition current detection unit and an addition unit are provided in a preamplifier and a threshold voltage detection circuit that are part of a transimpedance amplifier in the optical reception module according to the third embodiment of the present invention. FIG. 10 is a circuit diagram showing an example of another specific circuit configuration in which the transition current detection unit is provided in the preamplifier circuit and the transition current addition unit is provided at the output of the threshold voltage detection circuit in the optical receiver module according to the third embodiment of the present invention. . In the embodiment of FIG. 7, the output voltage of the preamplifier and the transition voltage waveform generated across the resistance of the transition current adder circuit are calculated. In the embodiment of FIG. 7, (a) shows the result of calculating the output voltage waveform of the transimpedance amplifier for each of the cases where the transition voltage waveform is not added and (b) is the case where the transition voltage waveform is added. It is an example which showed the effect. (A) is a block diagram and (b) is an explanatory diagram showing transmission quality when an optical transmission technique is applied to inter-board communication in an information communication apparatus that is an object of the present invention. It is explanatory drawing of the relationship between the natural light emission noise which generate | occur | produces in the laser diode which causes the subject of this invention, and an optical signal. It is explanatory drawing of the random jitter increase phenomenon by the natural light emission noise which is the subject of this invention. It is explanatory drawing of the method of shortening the rise time of an output optical waveform with the transmission module by the conventional method (patent document 1). (a) is a block diagram of the laser driver, and (b) is an explanatory diagram of the principle and effect of shortening the rise time.

In the following embodiment, when it is necessary for the sake of convenience, the description will be divided into a plurality of sections or embodiments. However, unless otherwise specified, they are not irrelevant, and one is the other. Some or all of the modifications, details, supplementary explanations, and the like are related. Further, in the following embodiments, when referring to the number of elements (including the number, numerical value, quantity, range, etc.), especially when clearly indicated and when clearly limited to a specific number in principle, etc. Except, it is not limited to the specific number, and may be more or less than the specific number.

Further, in the following embodiments, the constituent elements (including element steps and the like) are not necessarily indispensable unless otherwise specified and apparently essential in principle. Needless to say. Similarly, in the following embodiments, when referring to the shapes, positional relationships, etc. of the components, etc., the shapes are substantially the same unless otherwise specified, or otherwise apparent in principle. And the like are included. The same applies to the above numerical values and ranges.

The circuit elements constituting each functional block of the embodiment are not particularly limited, but are formed on a semiconductor substrate such as single crystal silicon by an integrated circuit technology such as a CMOS (complementary MOS transistor) or a bipolar transistor. The In the embodiment, MOSFET (Metal Oxide Semiconductor Field Effect Transistor) (abbreviated as MOS transistor) is used as an example of MISFET (Metal Insulator Semiconductor Field Effect Transistor), but non-oxide film is excluded as a gate insulating film. Absent. The connection of the substrate potential of the transistor is not specified in the drawing, but the connection method is not particularly limited as long as the transistor can operate normally.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.

(Embodiment 1)
FIG. 1 is a block diagram showing an example of the configuration of an optical receiver module according to Embodiment 1 of the present invention. The reception module according to the first embodiment includes a photodiode PD that receives an optical signal and outputs a reception current signal, a transition current detection block IDET that detects and outputs a transition current of the reception current, which is a feature of the present invention, and the transition A transition current addition block IADD that adds current to the received current signal and a transimpedance TIA that converts the received current signal after addition into a voltage signal and outputs the voltage signal. As schematically shown in FIG. 1, the current waveform at each position is obtained by adding the transition current detected by the transition current detection / output block IDET to the transition time of the reception current signal. By adding to, it will stand up at high speed. As a result, the input of the transimpedance amplifier TIA rises faster than the optical waveform received by the photodiode PD. Therefore, the random jitter observed at the output of the transimpedance amplifier TIA is reduced as compared with the random jitter caused by the relative intensity noise RIN generated by the laser diode of the transmission module, and the transmission quality can be improved. Therefore, the light that can reduce the random jitter generated in the transmission module in the reception module and achieve transmission with high transmission waveform quality without causing a decrease in modulation power or an increase in power in the transmission module, which is an object of the present invention. A receiving circuit and a receiving optical module can be provided.

FIG. 2 shows a specific circuit configuration example of the transition current detection block IDET and the addition block IADD in FIG. 1 and a block configuration example of the transimpedance amplifier TIA. The transition current detection block IDET is an inductance L1 connected to the anode side of the photodiode, and one terminal is grounded and the other is an inductance L2 connected to the capacitor C of the transition current addition block. The transition current addition block IADD is a capacitor. Consists of C. The inductances L1 and L2 form a mutual inductance M having a strong coupling. Here, the transition current of the received current of the photodiode PD flowing through the inductance L1 flows through the mutual inductance M to the inductance L2. This current is added to the reception current via the capacitor C and flows into the input of the transimpedance amplifier TIA. As a result, the rise time of the input current waveform of the transimpedance amplifier TIA is faster than the rise time of the optical input waveform of the photodiode PD. The transimpedance amplifier TIA includes a preamplifier PRE, a threshold voltage detection circuit ATC, a post amplifier POST, and a driver DRV. The preamplifier PRE converts the input current into a voltage signal, and the threshold voltage detection circuit ATC detects the center voltage of the output voltage of the preamplifier, that is, the threshold voltage. The post-amplifier POST converts and amplifies the output voltage signal of the preamplifier PRE into a differential signal by amplifying the difference between the output voltage signal of the preamplifier PRE and the output voltage of the threshold voltage detection circuit, that is, the threshold voltage. Further, the driver outputs the differential signal from the transimpedance amplifier TIA. Therefore, the jitter observed at the output of the transimpedance amplifier TIA is smaller than the random jitter of the input waveform of the photodiode PD.

FIG. 3 is a configuration example similar to FIG. 2, except that the transition current of the received current is detected on the cathode side of the photodiode. The other configuration is the same as that of the embodiment of FIG. 2, and the operation is also the same. Therefore, this configuration has the same effect as the embodiment of FIG.

FIG. 5 is a configuration example in which the transition current detection block has the same configuration as that of the embodiment of FIG. 2, and the transition current addition block IADD is provided in the preamplifier PRE of the transimpedance amplifier TIA. The transition current addition block is composed of a capacitor C having one terminal connected to the input terminal and the other terminal connected to the load resistor R1 of the preamplifier PRE and the drain of the MOS transistor M1. This preamplifier PRE has an amplifier configuration combining a grounded-gate amplifier composed of a MOS transistor M2 and a load resistor R2, and a common-source amplifier composed of a constant current reduction IST1, a MOS transistor M1, and a load resistor R1. This is a configuration that is advantageous for high bandwidth and high gain. The output terminal is the connection node N0 between the load resistor R1 and the MOS transistor M1, but output by a level shift circuit composed of the MOS transistor M3 and the constant current source IST2 in order to match the input voltage level with the post amplifier POST of the next stage To do. In this circuit, the change in the received current is transmitted to the node N0 via the MOS transistor, and at the same time, the transition current detected by the transition current detection block IDET is also added to the node N0 via the capacitor C, and the output voltage signal of the node N0 Rise time is reduced. As a result, the same effects as in FIG. 2 can be obtained in this embodiment.

(Embodiment 2)
FIG. 4 is a specific circuit configuration example in which the transition current addition block IADD is provided at the output of the threshold voltage detection circuit ATC of the transimpedance amplifier TIA in the optical receiver module according to Embodiment 2 of the present invention. In the present embodiment, the transition current of the received current is detected in the same manner as in FIG. 2, with the inductance L1 connected between the cathode of the photodiode PD and the input of the transimpedance amplifier TIA, and one terminal grounded. Detection is performed by an inductance L2 whose terminal is connected to the input terminal of the current addition block. On the other hand, the transition current addition block includes a delay circuit DLY that delays the transition current detected by the inductance L2 and transmits the delay current to the capacitor C and the resistor R, and a resistor R and the capacitor C that convert the transition current into a differential voltage waveform. The transition current flows through the capacitor C and the resistor R through the delay circuit DLY, and then flows into the threshold voltage detection circuit ATC. Here, if the output impedance of the threshold voltage detection circuit ATC is designed to be low, the output voltage of the threshold voltage detection circuit, that is, the center voltage of the output waveform of the preamplifier PRE is applied to one input terminal Vn of the post amplifier POST. A voltage waveform obtained by adding the voltage waveform obtained by differentiating the voltage waveform of the product of the transition current and the resistance with the resistor R and the capacitor C is added. As a result, in the post-amplifier POST, the difference between the differential input terminals Vp and Vn is amplified and amplified, so that the above-mentioned differential waveform overlaps within the transition time of the output voltage of the preamplifier PRE. By setting the delay of DLY, an effect of equivalently shortening the rise time of the output voltage signal of the preamplifier PRE can be obtained. For this reason, the random jitter observed at the output of the transimpedance amplifier TIA is reduced as compared with the random jitter caused by the relative intensity noise generated in the laser diode of the transmission module, and the transmission quality can be improved.

(Embodiment 3)
FIG. 6 is a circuit configuration example in which the transition current detection block IDET and the addition block IADD are provided in the preamplifier PRE of the transimpedance amplifier TIA and the threshold voltage detection circuit ATC in the optical receiver module according to the third embodiment of the present invention. In this embodiment, the detection of the transition current of the received current is performed by detecting the inductance L1 connected between the load resistor R1 of the preamplifier PRE and the drain of the MOS transistor M1, and one terminal being grounded and the other terminal being a current adding block. Detect with inductance L2 connected to input terminal. The transition current addition block is a circuit similar to the above-described embodiment of FIG. In the preamplifier PRE of this embodiment, the received current does not flow through the photodiode PD unless an optical signal is input. Therefore, the load resistor R1, the inductance L2 of the transition current detection block, and the MOS transistor M1 are the same as the current of the constant current source IST1. Constant current is flowing. However, when an optical signal enters the photodiode PD, a reception current flows, and this current flows into the constant current source. As a result, the load resistor R1, the inductance L2 of the transition current detection block, and the current flowing through the MOS transistor M1 are the same amount as the received current. That is, the same current signal as the reception current of the photodiode PD flows through the inductance L2 of the transition current detection block, and the transition current of the reception current can be detected by the inductances L2 and L1. Therefore, by inputting the detection current of the transition current detection block IDET to the transition current addition block IADD, the effect of shortening the rise time of the output voltage signal of the preamplifier PRE can be obtained as in FIG. As a result, the random jitter observed at the output of the transimpedance amplifier TIA is reduced compared to the random jitter caused by the relative intensity noise generated in the laser diode of the transmission module, and the transmission quality can be improved.

FIG. 7 is a circuit configuration example in which the transition current detection block IDET is provided in the preamplifier PRE and the transition current addition block IADD is provided in the output of the threshold voltage detection circuit ATC in the optical receiver module according to the third embodiment of the present invention. In this embodiment, the transition current of the received current is detected by the inductances L2 and L1 connected between the load resistor R1 of the preamplifier PRE and the drain of the MOS transistor M1, as in FIG. Current flows in the inductance L1. Therefore, a transition voltage signal proportional to the transition current is generated at both ends of the resistor Rb when the current of the inductance L1 flows through the resistor Rb during the time when the output voltage signal of the preamplifier PRE is transitioning. The threshold voltage detection circuit ATC outputs the center voltage of the output voltage waveform of the preamplifier PRE by setting the band to several hundreds KHz with a low-pass filter composed of the resistor R1 and the capacitor C1. For this reason, a voltage waveform is generated at the input terminal Vn of the postamplifier POST by adding the transition voltage waveform proportional to the aforementioned transition current to the center voltage of the output voltage waveform of the preamplifier PRE, that is, the threshold voltage. FIG. 8 shows an example of the result of simulating this situation. It shows that a transition voltage signal is generated across the resistor Rb at the transition time of the output voltage waveform of the preamplifier PRE. Therefore, in the post amplifier POST, the differential voltage signal of the input terminals Vp and Vn is amplified, and the transition voltage of Vn is added, so that the rise time of the input signal voltage is equivalently shortened. That is, as in FIG. 6, the random jitter observed at the output of the transimpedance amplifier TIA improves the rise time of the POST input waveform to the post amplifier. 9A shows an example of the result of calculating the output voltage waveform of the transimpedance amplifier for each of the cases where the transition voltage waveform is not added and FIG. 9B is the case where the transition voltage waveform is added. As can be seen from this result, even in the embodiment of the present invention, random jitter due to noise in the voltage amplitude direction caused by relative intensity noise generated in the laser diode of the transmission module can be reduced, and transmission quality can be improved.

The optical receiver module according to the present embodiment is particularly useful for an optical receiver module that performs inter-board communication via an optical fiber cable in an information device. The present invention is not limited to this, and a laser diode and a photodiode are used. It can be widely applied to all products that perform optical communication.

PD photodiode LD laser diode LSI semiconductor chip TRIMP transition current detection / addition block IDET transition current detection block IADD transition current addition block TIA transimpedance amplifier PRE preamplifier ATC threshold voltage detection circuit POST postamplifier DRV driver L1 inductance L2 inductance C, C1 capacitor R, R1, R2, Rb Resistance DLY Delay circuit M1, M2, M3 MOS transistor IST1, IST2 Constant current source Tx Transmitter module Rx Receiver module LDD Laser driver circuit FI Optical fiber Pn Spontaneous emission noise P_OMA Modulation power P_H Optical output power at output high level P_L Optical output power at low output level Trf Output rise / fall time RIN_OMA Relative intensity noise to modulation power ER extinction ratio RJ_RIN Random jitter due to relative intensity noise BW Fundamental frequency of communication speed

Claims

In a light receiving module having a photodiode that receives an optical signal from a transmission module and converts it into a current signal, and a transimpedance amplifier that converts the current signal of the photodiode into a voltage signal and outputs it.
A transition current detecting means for detecting a transition current component of a current signal from the photodiode and outputting a transition current only within a time during which the current signal is transitioned;
Means for adding the transition current to a current signal of the photodiode within a transition time;
An optical receiver module comprising: a transimpedance amplifier that converts the current signal added with the transition current into a voltage signal.
The transition current detecting means has a mutual inductance composed of a first inductance and a second inductance,
The transition current adding means includes a capacitor,
One terminal of the first inductance is connected to the anode electrode of the photodiode, and the other terminal of the first inductance is connected to the input terminal of the transimpedance amplifier and to the first terminal of the capacitor. Connected,
2. The optical receiver module according to claim 1, wherein one terminal of the second inductance is grounded, and the other terminal of the second inductance is connected to the second terminal of the capacitor.
The transition current detecting means has a mutual inductance composed of a first inductance and a second inductance,
The transition current adding means is configured using a capacitor having a first terminal connected to an input terminal of the transimpedance amplifier,
One terminal of the first inductance is connected to the cathode electrode of the photodiode, the other terminal of the first inductance is connected to the first power supply terminal,
2. The optical receiver module according to claim 1, wherein one terminal of the second inductance is grounded, and the other terminal of the second inductance is connected to the second terminal of the capacitor. .
2. The optical receiver module according to claim 1, wherein the transimpedance amplifier includes a preamplifier, a threshold voltage detection circuit, a post amplifier having first and second differential input terminals, and a driver.
The transition current detection means is configured using a mutual inductance composed of a first inductance and a second inductance,
The transition current adding means has an input terminal connected to the second inductance, and
The output terminal is grounded via the capacitor,
5. The optical receiver module according to claim 4, comprising a delay circuit connected to an output terminal of the threshold voltage detection circuit via a second input terminal of the post amplifier and a resistor.
The drain terminal of the preamplifier is connected to the first power supply terminal via the first resistor,
The gate is connected to the drain of the first MOS transistor;
A grounded-gate amplifier including a first MOS transistor whose source is grounded via a first constant current source;
A drain is connected to the first power supply terminal via a second resistor, a gate is connected to the source of the first MOS transistor together with the input terminal of the preamplifier, and the source is grounded from the second MOS transistor. And a grounded source amplifier,
The transition current detection means is a mutual inductance configured using a first inductance and a second inductance,
The transition current adding means is configured by using a capacitor whose first terminal is connected to the output node of the grounded-gate amplifier of the preamplifier,
One terminal of the first inductance is connected to the anode electrode of the photodiode, the other terminal of the first inductance is connected to the input terminal of the transimpedance amplifier,
5. The light according to claim 4, wherein one terminal of the second inductance is grounded, and the other terminal of the second inductance is connected to the second terminal of the capacitance of the transition current adding means. Receive module.
The transition current detection means is a mutual inductance composed of a first inductance and a second inductance,
The transition current adding means includes a delay circuit, a resistor, and a capacitor,
The drain of the preamplifier is connected to the first power supply terminal via the first resistor and the first inductance.
A gate of the preamplifier is connected to a drain terminal of the first MOS transistor;
The source of the preamplifier is a grounded-gate amplifier composed of a first MOS transistor grounded via a first constant current source;
The drain of the preamplifier is connected to a first power supply terminal via a second resistor, the gate is connected to the source of the first MOS transistor together with the input terminal of the preamplifier, and the source is grounded. A common source amplifier composed of MOS transistors,
The delay circuit of the transition current adding means has its input terminal grounded via the second inductance,
The output terminal of the delay circuit is grounded through the capacitor,
5. The optical receiver module according to claim 4, wherein the output terminal is connected to a second input terminal of the post amplifier and an output terminal of the threshold voltage detection circuit via the resistor.
The transition current detection means is a mutual inductance composed of a first inductance and a second inductance,
The transition current adding means is configured using a resistor,
The drain of the preamplifier is connected to the first power supply terminal via the first resistor and the first inductance,
The gate of the preamplifier is connected to the drain of the first MOS transistor;
A grounded-gate amplifier comprising a first MOS transistor in which the source of the preamplifier is grounded via a first constant current source;
A drain of the preamplifier is connected to a first power supply terminal via a second resistor;
The gate is connected to the source of the first MOS transistor together with the input terminal of the preamplifier,
A source-grounded amplifier comprising a second MOS transistor with the source grounded;
The resistance element of the transition current adding means and the second inductance are connected in parallel,
A resistance element included in the transition current adding means and the second inductance are connected in parallel between two terminals,
2. The optical receiver module according to claim 1, wherein one terminal is connected to an output terminal of the threshold voltage detection circuit, and the other terminal is connected to a second input terminal of the post amplifier.