CN113447052A - Light receiving assembly and light sensing equipment - Google Patents
Light receiving assembly and light sensing equipment Download PDFInfo
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- CN113447052A CN113447052A CN202110633918.XA CN202110633918A CN113447052A CN 113447052 A CN113447052 A CN 113447052A CN 202110633918 A CN202110633918 A CN 202110633918A CN 113447052 A CN113447052 A CN 113447052A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/3538—Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like
Abstract
The embodiment of the application provides a light receiving assembly and light sensing equipment. The light receiving module includes: the device comprises a first photodiode, a second photodiode, an optical signal input end and an amplifying circuit module; the first photodiode is connected with the optical signal input end and used for outputting a first photocurrent; the first photocurrent includes: a first dark current and a photocurrent generated based on the light; the light ray includes: an optical signal input by the optical signal input end and ambient light of the environment where the first photodiode is located; the second photodiode is connected with the first photodiode and used for outputting a second photocurrent; the second photocurrent includes: a second dark current and a photocurrent generated based on ambient light of an environment in which the second photodiode is located; and the amplifying circuit module is respectively connected with the cathode of the first photodiode and the anode of the second photodiode and is used for amplifying the differential current between the first photocurrent and the second photocurrent.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a light receiving assembly and light sensing equipment.
Background
The PIN-FET (P-Intrinsic-N Field-Effect Transistor) light receiving component is an important receiving and detecting device in the optical fiber sensing system, and the noise and the receiving sensitivity of the P-Intrinsic-N Field-Effect Transistor directly influence the precision of the optical fiber sensing system. The conventional PIN-FET light receiving component generally performs signal detection by a single photoelectric signal detection chip, and inputs a signal current into a transimpedance amplification circuit for amplification and output. However, when a single photodiode chip detects an optical signal and performs photoelectric conversion, a dark current of the chip itself and a spatial stray light signal are input to the transimpedance amplifier, so that a light receiving component generates large noise, the signal is easily interfered, receiving accuracy is affected, reliability is poor, and particularly, when the photodiode chip is applied to a sensing system with high requirements on receiving accuracy, receiving sensitivity is difficult to guarantee.
Disclosure of Invention
The embodiment of the invention provides a light receiving assembly and light sensing equipment.
The technical scheme of the embodiment of the invention is realized as follows:
an embodiment of the present invention provides a photoelectric device, including: the device comprises a first photodiode, a second photodiode, an optical signal input end and an amplifying circuit module;
the first photodiode is connected with the optical signal input end and used for outputting a first photocurrent; wherein the first photocurrent includes: a first dark current and a photocurrent generated based on the light; the light ray includes: an optical signal input by the optical signal input end and ambient light of the environment where the first photodiode is located;
the second photodiode is connected with the first photodiode and used for outputting a second photocurrent; the second photocurrent includes: a second dark current and a photocurrent generated based on ambient light of an environment in which the second photodiode is located;
and the amplifying circuit module is respectively connected with the cathode of the first photodiode and the anode of the second photodiode and is used for amplifying the differential current between the first photocurrent and the second photocurrent.
In the above scheme, the light receiving module further includes: a first ceramic pad;
the anode of the first photodiode is connected with the optical signal input end and the power supply end of the amplifying circuit module through the first gold-plated area of the first ceramic cushion block;
and the cathode of the first photodiode is connected with the signal input end of the amplifying circuit module through the second gold-plated area of the first ceramic cushion block.
In the above scheme, the light receiving module further includes: a second ceramic cushion block;
and the first gold-plated area of the second ceramic cushion block is connected with the second gold-plated area of the first ceramic cushion block.
In the above solution, the anode of the second photodiode is connected to the cathode of the first photodiode through the first gold-plated region of the second ceramic pad;
and the cathode of the second photodiode is connected with the ground electrode through the second gold-plated area of the second ceramic cushion block.
In the above scheme, the power supply terminal of the amplifying circuit module is configured to provide a bias voltage for the first photodiode and the second photodiode, so that the first photodiode and the second photodiode are in a reverse bias working state.
In the above scheme, the light receiving module further includes: an input optical fiber;
the optical signal input end is butted with the input optical fiber and is used for receiving the optical signal output by the input optical fiber and transmitting the optical signal output by the optical fiber to the photosensitive surface of the first photodiode.
In the above scheme, the second photodiode and the first photodiode are photodiodes of the same type.
In the above scheme, the first photodiode and the second photodiode are both PIN diodes or avalanche photodiodes.
In the above scheme, the light receiving module further includes: a package housing;
the packaging shell covers the first photodiode, the second photodiode, the first ceramic cushion block, the second ceramic cushion block, the optical signal input end and the outer side of the amplifying circuit module.
In the above scheme, the package housing is a dual in-line cartridge or a butterfly cartridge.
The embodiment of the invention also provides optical sensing equipment which comprises the optical receiving component provided by any technical scheme.
The optical sensing device provided in the embodiment of the present invention, which forms a differential connection through the second photodiode and the first photodiode, specifically includes: dark current on the first photodiode and photocurrent generated based on ambient light in a space where the light receiving assembly is located are eliminated, so that the first photodiode only transmits current generated based on input light signals to the amplifying circuit for amplification, noise caused by the dark current and response current generated based on the ambient light in the space is reduced, integral noise of the light receiving assembly is reduced, and receiving quality of the light receiving assembly is improved, so that integral measuring accuracy of the light sensing device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a partial circuit of a light receiving module according to the present invention;
FIG. 2 is a schematic view of a partial structure of a light receiving module provided in the present invention;
FIG. 3 is a schematic diagram of a general structure of a light receiving module according to the present invention;
FIG. 4 is a schematic diagram of a general structure of a light receiving module according to the present invention;
fig. 5 is a schematic structural diagram of a light sensing device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict. Although a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than presented herein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing embodiments of the invention only and is not intended to be limiting of the invention.
Fig. 1 is a circuit diagram of a partial circuit of a light receiving module according to the present invention. As described with reference to fig. 1, the light receiving module 10 includes a light receiving module 110 and an amplifying circuit module 120; wherein, the light receiving module 110 includes: a first photodiode 111, a second photodiode 112, an optical signal input terminal 113;
a first photodiode 111 connected to the optical signal input terminal 113 for outputting a first photocurrent; wherein the first photocurrent includes: a first dark current and a photocurrent generated based on the light; the light ray includes: an optical signal input by the optical signal input terminal 113 and ambient light of an environment where the first photodiode 111 is located; a second photodiode 112 connected to the first photodiode 112, for outputting a second photocurrent; the second photocurrent includes: a second dark current and a photocurrent generated based on ambient light of an environment in which the second photodiode 112 is located; and an amplifying circuit module 120 connected to the cathode of the first photodiode 111 and the anode of the second photodiode 112, respectively, for amplifying a differential current between the first photocurrent and the second photocurrent.
Specifically, the first photocurrent generated by the first photodiode 111 can be referred to as I1, the light signal input based on the light signal input terminal 113 can be referred to as Isign, and the first dark current on the first photodiode can be referred to as Idark 1; the photocurrent generated by the first photodiode 111 based on the ambient light in the space where the light receiving component is located can be referred to as ibabacksound 1, where ibabacksound 1 is the current generated by the first photodiode 111 under the detection space due to the spatial stray light;
the first photocurrent I1 ═ Isign + ibaback ground1+ Idark 1.
The second photodiode 112 generates a second photocurrent may be referred to as I2, and the second dark current on the second photodiode 112 may be referred to as Idark 2; the photocurrent generated by the second photodiode 112 based on the ambient light in the space where the light receiving component is located can be referred to as ibabacksound 2, where ibabacksound 2 is the current generated by the second photodiode 112 under the detection space due to the spatial stray light;
the second photocurrent I2 ═ Ibackground2+ Idark 2.
The difference current between the first photocurrent and the second photocurrent may be:
I＝I1-I2＝Isign+Ibackground1+Idark1-Ibackground2-Idark2。
it should be noted that, in some embodiments, when the second dark current on the second photodiode 112 is equal to the first dark current on the first photodiode 111, and the photocurrent ibaback 2 generated by the second photodiode 112 is the same as the photocurrent ibaback 1 generated by the first photodiode 111, the difference current I between the first photocurrent and the second photocurrent is Isign; in this embodiment, the forming of the differential connection between the second photodiode and the first photodiode, and the second photocurrent generated by the second photodiode specifically include: the second dark current and the photocurrent based on the conversion of the ambient light of the space where the light receiving component is located are eliminated from the dark current of the first photodiode and the photocurrent generated based on the ambient light, so that the current generated based on the input light signal is only used as the final output signal of the light receiving component by the first photodiode and is transmitted to an amplifying circuit for amplification, the noise caused by the dark current of the first photodiode and the response current generated based on the space ambient light is reduced, the integral noise of the light receiving component is reduced, the receiving quality of the light receiving component is improved, and the integral measuring precision of the sensing system is improved.
Further, fig. 2 is a schematic partial structure diagram of the light receiving module provided by the present invention. As described with reference to fig. 2, the light receiving module 10 further includes: a first ceramic pad 114; the anode of the first photodiode 111 is connected to the power supply terminal 122 of the amplifying circuit module 120 through the first gold-plated area 1141 of the first ceramic pad 114; the cathode of the first photodiode 111 is connected to the signal input terminal 121 of the amplifying circuit module 120 through the second gold-plated area 1142 of the first ceramic pad 114.
Further, the light receiving module further includes: a second ceramic mat 115; the first gold-plated region 1151 of the second ceramic mount 115 is connected to the second gold-plated region 1142 of the first ceramic mount 114.
Specifically, the photocurrent on the photodiode can be directly transmitted to other devices in the light receiving assembly through the gold-plated pattern and gold wire on the ceramic cushion block, and the back of the photodiode is fixed on the ceramic cushion block, so that the photosensitive surface of the photodiode can keep a better angle for receiving the input optical signal, the movement of the photodiode can be reduced, and the photodiode is not easy to fall off.
Further, the anode of the second photodiode 112 is connected to the cathode of the first photodiode 111 through the first gold-plated region 1151 of the second ceramic pad 115; the cathode of the second photodiode 112 is connected to ground through a second gold-plated region 1152 of the second ceramic pad 115.
Specifically, the first photodiode 111 and the second photodiode 112 are bonded to the ceramic pad by conductive adhesive, so that the cathode of the photodiode can be electrically connected to the gold-plated region.
It should be noted that, in this embodiment, the cathode of the first photodiode and the anode of the second photodiode are connected through the first ceramic spacer and the second ceramic spacer, so that the first photocurrent of the first photodiode and the second photocurrent of the second photodiode form a differential current, the ambient photocurrent of the first photocurrent and the ambient photocurrent of the second photocurrent are cancelled out, and the first dark current of the first photodiode and the second dark current of the second photodiode are cancelled out, so that only the current generated based on the input optical signal is used as the final output signal of the light receiving module, and is transmitted to the amplifying circuit for amplification, thereby reducing the noise caused by the self dark current and the response current generated based on the spatial ambient light, reducing the overall noise effect of the light receiving module, and improving the receiving accuracy and performance of the light receiving module, the precision of the optical fiber sensing system is improved.
Further, the power supply terminal 122 of the amplifying circuit module 120 is configured to provide a bias voltage for the first photodiode 111 and the second photodiode 112, so that the first photodiode 111 and the second photodiode 112 are in a reverse bias operating state.
Specifically, the power supply terminal 122 of the amplifying circuit module 120 provides a negative voltage, the negative voltage provides a bias voltage for the first photodiode 111 and the second photodiode 112, a dc voltage is preset, so that the photodiodes are in a reverse-biased operating state, that is, only a dark current passes through the first photodiode 111 and the second photodiode 112 in the absence of light.
The light receiving module 10 further includes: an input optical fiber 20; the optical signal input end 113 is connected to the input optical fiber 20, and is configured to receive the optical signal output by the input optical fiber 20 and transmit the optical signal output by the optical fiber 20 to the photosensitive surface of the first photodiode 111.
Specifically, the input optical fiber 20 is in an inclined plane butt joint with the optical signal input end 113, and the inclined plane angle of the optical fiber 20 is optimally 8 °.
In this embodiment, the input optical fiber 20 and the optical signal input end 113 are in inclined butt joint, so that an optical signal input by the optical fiber can be better coupled at the optical signal input end, and the optical signal input by the input optical fiber 20 is prevented from being reflected at the optical signal input end to affect subsequent work.
Further, the second photodiode 112 and the first photodiode 111 are the same type of photodiode.
Specifically, the first photodiode 111 and the second photodiode 112 are both PIN diodes or avalanche photodiodes.
Here, it should be noted that, in some examples, the photocurrent ibaback 2 generated by the second photocurrent 112 may be different from the photocurrent ibaback 1 generated by the first photodiode 111; the second dark current on the second photodiode 112 may be different in magnitude from the first dark current on the first photodiode 111; in this embodiment, the second photodiode and the first photodiode use the same model, and are connected to each other, and when being in the same space, can make dark current based on self and the background current based on ambient light production on two diodes equal basically, thereby make first photocurrent with the difference current between the second photocurrent approaches the electric current that input optical signal produced, realize only regard the electric current that produces based on input optical signal as the final output signal of light receiving component, transmit for amplifier circuit and amplify, the noise that the response current that has reduced self dark current and produced based on space ambient light brought has reduced the holistic noise effect of light receiving component, the receiving accuracy and the performance of light receiving component have been improved, the precision of promotion optical fiber sensing system.
Further, the light receiving module 10 further includes: a package housing 130;
the package housing 130 covers the first photodiode 111, the second photodiode 112, the first ceramic pad 114, the second ceramic pad 115, the optical signal input terminal 113, and the amplification circuit module 120.
Further, the package housing 130 is a dual inline package or a butterfly package.
Specifically, the number of the pins of the tube shell includes, but is not limited to, 14 pins, 8 pins and 6 pins.
Hereinafter, a light receiving module according to an embodiment of the present invention is described with a specific example, as shown in fig. 4, fig. 4 is a schematic diagram of a general structure of a light receiving module provided by the present invention:
a dual Photodiode (PD) differential PIN-FET light receiving element comprising: the device comprises a first photodiode 1, a second photodiode 2, a first ceramic cushion block 31, a second ceramic cushion block 32, an input optical fiber 4, a transimpedance amplification circuit 5 and a tube shell 6;
the back of the first photodiode 1 is connected to the first ceramic block 31 through conductive adhesive, and the back of the second photodiode 2 is connected to the second ceramic block 32 through conductive adhesive; the back of the photodiode is a cathode, and the front of the photodiode is an anode.
The anode of the first photodiode 1 is connected to the power supply terminal 52 of the transimpedance amplifier circuit 5 through the first gold-plated region 311 of the first ceramic pad 31;
the cathode of the first photodiode 1 is connected to the signal input terminal 51 of the transimpedance amplifier circuit 5 through the second gold-plated region 312 of the first ceramic pad 31.
The second photodiode 2 is in the same space as the first photodiode 1 and is used for generating a second photocurrent; here, the second photocurrent includes: a photocurrent and a second dark current on the second photodiode 2 are generated based on the detection space stray light.
The anode of the second photodiode 2 is connected to the cathode of the first photodiode 1 through the first gold-plated region 321 of the second ceramic pad 32;
the cathode of the second photodiode 2 is connected to the ground through the second gold-plated area 322 of the second ceramic pad 32, and the ground is grounded through the package 6.
The power supply terminal 52 of the transimpedance amplification circuit 5 provides a voltage of-5V for providing a bias voltage for the first photodiode and the second photodiode, so that the first photodiode and the second photodiode operate in a reverse bias state.
The signal light input optical fiber 4 is butted with the optical signal input end, and is used for receiving the signal light of an external system and transmitting the optical signal to the optical signal input end. The optical signal input end transmits the received optical signal output by the input optical fiber 4 to the first photodiode 1.
The input optical fiber 4 couples the energy of the incident light beam to the optical signal input end to the maximum extent, the optical signal input end transmits the light to the photosensitive surface of the first photodiode 1, and the light is absorbed by the first photodiode 1, so that the optical signal is converted into an electrical signal. The end face of the input optical fiber 4 is at an angle of 8 degrees relative to the optical signal input end, so that the influence of reflected light on the end face of the optical fiber on an external system is effectively reduced.
In the present embodiment, the first photocurrent generated by the first photodiode 1 is: the dark current Idark1+ generated based on the light signal inputted from the light signal input terminal is Isign + itself generated based on the Ibackground1 generated based on the ambient light of the space where the light receiving component is located, and the second photocurrent generated by the second photodiode 2 is: own dark current Idark2+ Ibackground2 generated based on ambient light of the space in which the light receiving element is located; here, the first photodiode 1 and the second photodiode are the same type of photodiode; idark1 ═ Idark2, ibabacksound 1 ═ ibabacksound 2, and the differential current between the first photocurrent and the second photocurrent is Isign. The difference current Isign is inputted to the transimpedance amplifier circuit 5 for amplification as a final output signal of the light receiving element.
The double-photodiode differential PIN-FET light receiving assembly can remove noise caused by space stray light response current and dark current, and the effect of reducing the overall noise of the light receiving assembly is achieved. Compared with a single photodiode chip PIN-FET light receiving component with the same specification, the precision of the optical fiber sensing system is improved, and the performance of the optical fiber sensing system is improved.
As shown in fig. 5, fig. 5 is a schematic structural diagram of a light sensing device, where the light sensing device 50 includes a light receiving component 53 provided in any of the above-mentioned technical solutions;
in particular, the light sensing device 50 further comprises a light emitting assembly 51 for emitting a light signal.
Specifically, the light emitting component 51 provides an input optical signal for the light sensing device 50, and in some embodiments, the light emitting component 51 may be a light emitting diode; in other embodiments, the light emitting assembly 51 may also be other light source devices such as a laser, which is not limited herein.
The light receiving component 53 is used for receiving the light signal returned by the light sensing device 50.
Further, the optical sensing device 50 includes an optical beam splitter 52 and an optical modulator 53, the optical beam splitter 52 and the optical modulator 53 are used for splitting and modulating the optical signal emitted by the optical emitting component 51;
the light sensing device 50 further comprises a sensitive optical element 54, the sensitive optical element 54 being adapted to sense an external physical quantity; the external physical quantity may be an angular velocity; wherein the sensitive optical element 54 may be a polarization maintaining fiber loop.
Specifically, the optical modulator 53 may also demodulate an optical signal received by the optical receiving assembly 55.
Specifically, the optical modulator 53 receives an input optical signal emitted by the optical emission component 51 and modulates parameters of the input optical signal, including but not limited to intensity, phase, and the like of the input optical signal.
The optical signal emitted from the light emitting module 51 is modulated by the optical modulator 53 and then input to the sensitive optical element 54. The sensitive light source element 54 applies an external physical quantity signal to the optical signal and returns the optical signal to the optical modulator 53 for demodulation, and then the optical signal is transmitted to the optical beam splitter 52, the optical signal is coupled to the optical signal input end of the optical receiving component 55 through the optical beam splitter 52, the photoelectric conversion is performed through the photodiode in the optical receiving component 55, the returned optical signal is converted into the input current of the amplifying circuit, the current amplification is performed, and the function of sensing and detecting the physical quantity is realized. The light receiving assembly reduces noise caused by self dark current on the photodiode and response current generated based on space environment light, reduces overall noise of the light receiving assembly, and improves receiving quality of the light receiving assembly, so that overall measuring accuracy of the light sensing device is improved.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A light receiving module, comprising: the device comprises a first photodiode, a second photodiode, an optical signal input end and an amplifying circuit module;
the first photodiode is connected with the optical signal input end and used for outputting a first photocurrent; wherein the first photocurrent includes: a first dark current and a photocurrent generated based on the light; the light ray includes: an optical signal input by the optical signal input end and ambient light of the environment where the first photodiode is located;
the second photodiode is connected with the first photodiode and used for outputting a second photocurrent; the second photocurrent includes: a second dark current and a photocurrent generated based on ambient light of an environment in which the second photodiode is located;
and the amplifying circuit module is respectively connected with the cathode of the first photodiode and the anode of the second photodiode and is used for amplifying the differential current between the first photocurrent and the second photocurrent.
2. The light receiving module according to claim 1, further comprising: a first ceramic pad;
the anode of the first photodiode is connected with the optical signal input end and the power supply end of the amplifying circuit module through the first gold-plated area of the first ceramic cushion block;
and the cathode of the first photodiode is connected with the signal input end of the amplifying circuit module through the second gold-plated area of the first ceramic cushion block.
3. The light-receiving module as claimed in claim 2, further comprising: a second ceramic cushion block;
and the first gold-plated area of the second ceramic cushion block is connected with the second gold-plated area of the first ceramic cushion block.
4. The light receiving module of claim 3, wherein the anode of the second photodiode is connected to the cathode of the first photodiode through the first gold-plated region of the second ceramic spacer;
and the cathode of the second photodiode is connected with the ground electrode through the second gold-plated area of the second ceramic cushion block.
5. The optical receiving module as claimed in claim 2, wherein the power supply terminal of the amplifying circuit module is configured to provide a bias voltage to the first photodiode and the second photodiode, so that the first photodiode and the second photodiode are in a reverse-biased operating state.
6. The light receiving module according to claim 1, further comprising: an input optical fiber;
the optical signal input end is butted with the input optical fiber and is used for receiving the optical signal output by the input optical fiber and transmitting the optical signal output by the optical fiber to the photosensitive surface of the first photodiode.
7. The light receiving module of claim 1, wherein the second photodiode and the first photodiode are the same type of photodiode.
8. The light receiving module of claim 1, wherein the first photodiode and the second photodiode are both PIN diodes or avalanche photodiodes.
9. The light receiving module according to claim 1, further comprising: a package housing;
the packaging shell covers the first photodiode, the second photodiode, the first ceramic cushion block, the second ceramic cushion block, the optical signal input end and the outer side of the amplifying circuit module.
10. The light receiving module of claim 9, wherein the package housing is a dual inline package or a butterfly package.
11. A light sensing device characterized by comprising the light receiving element according to any one of claims 1 to 10.
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| CN113701660A (en) * | 2021-09-29 | 2021-11-26 | 欧梯恩智能科技(苏州)有限公司 | Optical sensing demodulation module and optical sensing system |
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