Integrated multi-channel high-low noise high-speed balance detection assembly and optical module

Abstract

The invention provides an integrated multi-channel high-low noise high-speed balance detection assembly and an optical module. The integrated multi-channel high-low noise high-speed balance detection assembly comprises a detection channel group and a circuit board which are arranged in a packaging shell and are coupled with each other, in each detection channel, the output end of the mixer is respectively coupled with a first stray light suppressor and a second stray light suppressor, the first stray light suppressor and the second stray light suppressor are both coupled with a balance detector, and the balance detector is connected with a corresponding sub-circuit on the circuit board; the mixer converts input light into a differential signal, noise suppression is carried out on the differential signal through the first stray light suppressor and the second stray light suppressor, and then the differential signal is transmitted to the balance detector and the sub-circuit to complete photoelectric conversion and realize signal receiving processing; through the above structure, the stray light suppressor is introduced into the detection channel, noise introduced by the mixer and multiple channels is optimized, the signal transmission performance is improved, and the stability and reliability of the detector are improved.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and particularly to an integrated multi-channel high-low noise high-speed balanced detection component and an optical module. Background Art

[0002] In the prior art, high-speed balanced detector technologies are widely applied in fields such as optical fiber communication, radio frequency remote radio head, lidar, coherent detection, and remote sensing and telemetry. There are problems with conventional high-speed balanced detectors such as high dark current and low carrier mobility. Even when using III-V chips as balanced detector chips, there are problems such as large stray light noise and large common-mode noise. In many scenarios involving high-speed and high-precision measurement and sensing, a high-speed and low-noise balanced detector is often required, and most of the existing balanced detector-related devices are difficult to meet the requirements.

[0003] In view of this, overcoming the defects of this prior art is an urgent problem to be solved in this technical field. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to reduce the noise introduced by the balanced detector device during application, thereby improving the signal transmission performance and the stability and reliability of the detector.

[0005] The present invention adopts the following technical solutions:

[0006] In a first aspect, an integrated multi-channel high-low noise high-speed balanced detection component is provided, including: a packaging housing 1, a detection channel group 2, and a circuit board 3. The detection channel group 2 and the circuit board 3 are both disposed within the packaging housing 1, and the output ends of the respective detection channels 21 of the detection channel group 2 are coupled to the circuit board 3;

[0007] Each detection channel 21 in the detection channel group 2 includes: a mixer 211, a first stray light suppressor 212, a second stray light suppressor 213, and a balanced detector 214; the output end of the mixer 211 is respectively coupled to the first stray light suppressor 212 and the second stray light suppressor 213, both the first stray light suppressor 212 and the second stray light suppressor 213 are coupled to the balanced detector 214, and the balanced detector 214 is connected to a corresponding sub-circuit on the circuit board 3;

[0008] The mixer 211 is configured to receive an input optical signal and convert it into a pair of differential signals, which are respectively transmitted to the first stray light suppressor 212 and the second stray light suppressor 213. The first stray light suppressor 212 and the second stray light suppressor 213 are configured to suppress the noise of the corresponding differential signals and transmit the noise-suppressed differential signals to the balanced detector 214. The balanced detector 214 is configured to convert the differential signals into differential-mode electrical signals and transmit them to the corresponding sub-circuits on the circuit board 3.

[0009] Preferably, each detection channel 21 in the detection channel group 2 further includes a first attenuator 215 and a second attenuator 216, where:

[0010] The first attenuator 215 is disposed between the output end of the mixer 211 and the input end of the first stray light suppressor 212. The input end of the first attenuator 215 is coupled to the output end of the mixer 211, and the output end of the first attenuator 215 is coupled to the input end of the first stray light suppressor 212.

[0011] The second attenuator 216 is disposed between the output end of the mixer 211 and the input end of the second stray light suppressor 213. The input end of the second attenuator 216 is coupled to the output end of the mixer 211, and the output end of the second attenuator 216 is coupled to the input end of the second stray light suppressor 213.

[0012] Both the first attenuator 215 and the second attenuator 216 are configured to adjust the signal strength of the differential signals.

[0013] Preferably, all the sub-circuits on the circuit board 3 include: a first branch circuit 311, a second branch circuit 312, and an output circuit 313, where:

[0014] The first photodetector 214A and the second photodetector 214B of the balanced detector 214 are respectively connected to the output circuit 313. The output circuit 313 is configured to receive the electrical signals from the first photodetector 214A and the second photodetector 214B and convert them into voltage signals.

[0015] One end of the first branch circuit 311 is connected to the proximal power supply, and the other end of the first branch circuit 311 is connected to the first photodetector 214A. One end of the second branch circuit 312 is connected to the proximal power supply, and the other end of the second branch circuit 312 is connected to the second photodetector 214B. The first branch circuit 311 is configured to supply power to the first photodetector 214A, and the second branch circuit 312 is configured to supply power to the second photodetector 214B.

[0016] Preferably, the output circuit 313 specifically includes: a DC-blocking capacitor C1 and a matching resistor R1, where:

[0017] One end of the DC-blocking capacitor C1 is connected to the first photodetector 214A and the second photodetector 214B, and the other end of the DC-blocking capacitor C1 is connected to the subsequent low-noise amplifier;

[0018] The matching resistor R1 is connected to the first photodetector 214A and the second photodetector 214B.

[0019] Preferably, the first branch circuit 311 specifically includes: a first inductor L1 and a first capacitor C2, where: One end of the first inductor L1 is connected to the proximal power supply, and the other end of the first inductor L1 is connected to the first photodetector 214A; One end of the first inductor L1 is connected to the first photodetector 214A, and the other end of the first inductor L1 is grounded;

[0020] The second branch circuit 312 specifically includes: a second inductor L2 and a second capacitor C3, where: One end of the second inductor L2 is connected to the proximal power supply, and the other end of the second inductor L2 is connected to the second photodetector 214B; One end of the second inductor L2 is connected to the second photodetector 214B, and the other end of the second inductor L2 is grounded.

[0021] Preferably, the integrated multi-channel high-low noise high-speed balanced detection component further includes: a first array grating component 4, where:

[0022] The first array grating component 4 includes a plurality of first optical fiber channels 41, and the number of first optical fiber channels 41 in the first array grating component 4 is twice the number of detection channels 21 of the detection channel group 2;

[0023] Each adjacent two first optical fiber channels 41 in the first array grating component 4 are respectively used to transmit signal light and local oscillator light. Inside the packaging housing 1, each adjacent two first optical fiber channels 41 are grouped and coupled to the input end of a corresponding mixer 211 in the detection channel group 2 for transmitting signal light and local oscillator light to the corresponding mixer 211;

[0024] The pigtail of the first array grating component 4 is led out from one end of the packaging housing 1.

[0025] Preferably, the integrated multi-channel high-low noise high-speed balanced detection component further includes: a second array grating component 5 and a plurality of local oscillator light source components 6, where:

[0026] The multiple local oscillator light source components 6 are arranged inside the packaging housing 1. The number of the multiple local oscillator light source components 6 is the same as the number of the detection channels 21 of the detection channel group 2. Each local oscillator light source component 6 is coupled to the input end of the corresponding mixer 211 for inputting local oscillator light to the corresponding mixer 211.

[0027] The second arrayed grating component 5 includes multiple second optical fiber channels 51. The number of the second optical fiber channels 51 in the second arrayed grating component 5 is the same as the number of the detection channels 21 of the detection channel group 2. Inside the packaging housing 1, each second optical fiber channel 51 is coupled to the input end of the corresponding mixer 211 for inputting signal light to the corresponding mixer 211. The pigtail fiber of the second arrayed grating component 5 extends out from one end of the packaging housing 1.

[0028] Preferably, the local oscillator light source component 6 includes: a semiconductor laser 61, a collimating lens 62, a Fabry - Perot etalon 63, a reflector 64, and a focusing lens 65, where:

[0029] The semiconductor laser 61, the collimating lens 62, the Fabry - Perot etalon 63, the reflector 64, and the focusing lens 65 are all arranged inside the packaging housing 1. The semiconductor laser 61 is used for emitting signal light. The collimating lens 62, the Fabry - Perot etalon 63, the reflector 64, and the focusing lens 65 are arranged in sequence along the optical path of the signal light emitted by the semiconductor laser 61 to couple the signal light into the input end of the corresponding mixer 211.

[0030] Preferably, the integrated multi - channel high - low noise high - speed balanced detection component further includes an isolation member 7, and the isolation member 7 is arranged on the circuit board 3;

[0031] The isolation member 7 includes multiple isolation baffles 71 and a top plate 72. The multiple isolation baffles 71 are respectively arranged between two adjacent balanced detectors 214 and between two adjacent sub - circuits; the top plate 72 is arranged at the upper ends of the multiple isolation baffles 71.

[0032] In a second aspect, a light module is provided, including the integrated multi - channel high - low noise high - speed balanced detection component.

[0033] The present invention provides an integrated multi-channel high-low noise high-speed balanced detection component and an optical module, comprising: a packaging housing 1, a detection channel group 2, and a circuit board 3. The detection channel group 2 and the circuit board 3 are both disposed within the packaging housing 1, and the output ends of the respective detection channels 21 of the detection channel group 2 are coupled to the circuit board 3. Each detection channel 21 in the detection channel group 2 includes: a mixer 211, a first stray light suppressor 212, a second stray light suppressor 213, and a balanced detector 214. The output end of the mixer 211 is respectively coupled to the first stray light suppressor 212 and the second stray light suppressor 213, both the first stray light suppressor 212 and the second stray light suppressor 213 are coupled to the balanced detector 214, and the balanced detector 214 is connected to the corresponding sub-circuit on the circuit board 3. The mixer 211 converts the received input light into a differential signal, and performs noise suppression through the first stray light suppressor 212 and the second stray light suppressor 213, and then transmits it to the balanced detector 214 and the sub-circuit to complete optoelectronic conversion and realize signal reception and processing. Through the above structure, a stray light suppressor is introduced into the detection channel 21 to optimize the noise introduced by the mixer 211, improve the performance of signal transmission, and improve the stability and reliability of the detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0035] Figure 1 is a structural diagram of an integrated multi-channel high-low noise high-speed balanced detection component provided by an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of an integrated multi-channel high-low noise high-speed balanced detection component provided by an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by an embodiment of the present invention;

[0038] Figure 4 is a schematic diagram of a sub-circuit in an integrated multi-channel high-low noise high-speed balanced detection component provided by an embodiment of the present invention;

[0039] Figure 5 is a structural diagram of an integrated multi-channel high-low noise high-speed balanced detection component provided by an embodiment of the present invention;

[0040] Figure 6 It is the structural diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by the embodiment of the present invention;

[0041] Figure 7 It is the schematic diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by the embodiment of the present invention;

[0042] Figure 8 It is the structural diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by the embodiment of the present invention;

[0043] Figure 9 It is the schematic diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by the embodiment of the present invention;

[0044] Figure 10 It is the schematic diagram of another integrated multi-channel high-low noise high-speed balanced detection component provided by the embodiment of the present invention;

[0045] Among them, the figure numbers are as follows:

[0046] Encapsulation housing 1; Detection channel group 2; Detection channel 21; Mixer 211; First stray light suppressor 212; Second stray light suppressor 213; Balanced detector 214; First photodetector 214A; Second photodetector 214B; First attenuator 215; Second attenuator 216; Circuit board 3; First branch circuit 311; Second branch circuit 312; Output circuit 313; First array grating component 4; First optical fiber channel 41; Second array grating component 5; Second optical fiber channel 51; Local oscillator light source component 6; Semiconductor laser 61; Collimating lens 62; Etalon 63; Reflecting mirror 64; Converging lens 65; Isolation member 7; Isolation baffle 71; Top plate 72. Detailed implementation manners

[0047] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present disclosure.

[0049] In the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, for example, in the description, for the same type of nouns, the method of adding "A" and "B" at the end is used to describe them as two independent individuals. In this case, the features defined with "A" and "B" are only used for the purpose of distinguishing the same type of individuals and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0050] As used herein, "about", "substantially" or "approximately" includes the stated value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurement being discussed and the errors associated with the measurement of the specific quantity, i.e., the limitations of the measurement system.

[0051] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is to be construed in an open inclusive sense, i.e., "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples", etc., are intended to indicate that the specific features, structures, materials or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms are not necessarily directed to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the above-mentioned embodiments or examples due to reasons such as the order and position of appearance, they are not limited to being carried in a combined manner by one embodiment or example.

[0052] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Embodiment 1:

[0054] Embodiment 1 of the present invention provides an integrated multi-channel high-low noise high-speed balanced detection component, as Figure 1 and Figure 2 shown, comprising: a package housing 1, a detection channel group 2, and a circuit board 3. The detection channel group 2 and the circuit board 3 are both disposed within the package housing 1, and the output ends of the respective detection channels 21 of the detection channel group 2 are coupled to the circuit board 3.

[0055] Each detection channel 21 in the detection channel group 2 includes: a mixer 211, a first stray light suppressor 212, a second stray light suppressor 213, and a balanced detector 214; the output end of the mixer 211 is respectively coupled to the first stray light suppressor 212 and the second stray light suppressor 213, both the first stray light suppressor 212 and the second stray light suppressor 213 are coupled to the balanced detector 214, and the balanced detector 214 is connected to the corresponding sub-circuit on the circuit board 3.

[0056] In this embodiment, the configurations of each detection channel 21 in the detection channel group 2 can be the same, and the models of the components on each detection channel 21 can be the same. Each detection channel 21 in the detection channel group 2 is arranged in an array within the packaging housing 1 to achieve the optimal integration degree. The mixer 211 can be implemented using programmable logic controller (PLC) chips such as silicon photonics, lithium niobate, SiN, etc., and the balanced detector 214 can be implemented using GeSi or III-V platforms.

[0057] In this embodiment, the chips provided on the circuit board 3 can include one or more of a microcontroller unit (MCU), a laser driver chip, a limiting amplifier, a clock and data recovery (CDR) chip, a power management chip, and a digital signal processing (DSP) chip. The circuit board 3 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also achieve a bearing function. For example, the rigid circuit board can stably carry the above-mentioned electronic components and chips.

[0058] The mixer 211 is configured to receive the input light and convert the input light into a pair of differential signals and transmit them to the first stray light suppressor 212 and the second stray light suppressor 213 respectively. The first stray light suppressor 212 and the second stray light suppressor 213 are configured to suppress the noise of the corresponding differential signals and transmit the noise-suppressed differential signals to the balanced detector 214. The balanced detector 214 is configured to convert the differential signals into differential-mode electrical signals and transmit them to the corresponding sub-circuit on the circuit board 3.

[0059] In this embodiment, each mixer 211 includes two input ends, namely two waveguide inlets. In order to dock with a common single-mode optical fiber, it is necessary to optimize the mode spot of the input end to ensure mode matching. The two input ends are respectively used to receive signal light and local oscillator light. Therefore, the two input ends of the mixer 211 need to be docked from two different light sources. It should be noted that in order to reduce the return loss light generated by the reflection at the position of the input end of the mixer 211, the end face position of the input end of the mixer 211 can be polished with a preset angle. The preset angle is set by those skilled in the art. In this embodiment, the preset angle can be 8 degrees.

[0060] In this embodiment, an arrayed waveguide grating can be used to couple with the mixers 211 of multiple detection channels 21. The pigtails of the optical fibers in the arrayed waveguide grating are led out from the package housing 1 and docked with different light sources to achieve multi-channel optical signal transmission. The optical path outlet on the package housing 1 is sealed by welding with a sealing joint, and the upper cover of the overall shell is sealed by hermetic welding. After sealing, the influence of the external environment on the internal components is isolated.

[0061] The mixer 211 performs mixing processing on the input signal light and local oscillator light to generate a pair of differential signals. It should be noted that the noise usually included in a conventional balanced detector 214 generally includes dark current noise, stray light noise, common mode noise, and inter-channel noise. Therefore, in this embodiment, a balanced detector 214 based on a III-V platform is used to effectively reduce the dark current noise and increase the bandwidth. On this basis, using the mixer 211 will introduce more stray light. Therefore, in this embodiment, a first stray light suppressor 212 and a second stray light suppressor 213 are arranged between the mixer 211 and the balanced detector 214. After the differential signal passes through the corresponding first stray light suppressor 212 or second stray light suppressor 213, the stray light introduced by the mixer 211 is suppressed by the first stray light suppressor 212 or the second stray light suppressor 213, thereby optimizing most of the dark current noise, stray light noise, and common mode noise, improving the performance of optical signal transmission. After being received by the balanced detector 214, the balanced detector 214 converts the differential signal into a differential mode current signal and transmits it to the corresponding sub-circuit on the circuit board 3. The sub-circuit converts the differential mode current signal into a voltage signal, filters the voltage signal, and outputs it to other subsequent devices, thereby further analyzing or storing the data.

[0062] Further, since the mixer 211 converts the input signal light and local oscillator light into two differential signals with a 180-degree phase difference, it is necessary to adjust the common-mode rejection ratio of the two differential signals. The conventional mixer 211 can usually ensure that the common-mode rejection ratio of the output differential signal is 25 dB, but in some high-precision detection fields, a common-mode rejection ratio of more than 40 dB is required. To adjust the common-mode rejection ratio of the differential signal, it is necessary to adjust the intensity of the two differential signals. Therefore, this embodiment also involves the following design:

[0063] As Figure 3 shown, each detection channel 21 in the detection channel group 2 further includes a first attenuator 215 and a second attenuator 216, where: the first attenuator 215 is disposed between the output end of the mixer 211 and the input end of the first stray light suppressor 212. The input end of the first attenuator 215 is coupled to the output end of the mixer 211, and the output end of the first attenuator 215 is coupled to the input end of the first stray light suppressor 212; the second attenuator 216 is disposed between the output end of the mixer 211 and the input end of the second stray light suppressor 213. The input end of the second attenuator 216 is coupled to the output end of the mixer 211, and the output end of the second attenuator 216 is coupled to the input end of the second stray light suppressor 213; both the first attenuator 215 and the second attenuator 216 are used to adjust the signal intensity of the differential signal.

[0064] In this embodiment, the signal intensity of the differential signal is adjusted by the first attenuator 215 and the second attenuator 216, so that the two differential signals obtain a better common-mode rejection ratio, thereby meeting the requirements of high-sensitivity and high-precision measurements.

[0065] Further, after the differential signal received by the balanced detector 214, on the one hand, the balanced detector 214 needs to be powered by a corresponding power supply to realize the normal application of the balanced detector 214. On the other hand, after the balanced detector 214 converts the differential signal into an electrical signal, it is necessary to convert the electrical signal into a voltage signal for subsequent processing of the voltage signal. Therefore, this embodiment also involves the following design:

[0066] As Figure 4As shown, all sub - circuits on the circuit board 3 include: a first branch circuit 311, a second branch circuit 312, and an output circuit 313, where: the first photodetector 214A and the second photodetector 214B of the balanced detector 214 are respectively connected to the output circuit 313; the output circuit 313 is used to receive the electrical signals from the first photodetector 214A and the second photodetector 214B and convert them into voltage signals; one end of the first branch circuit 311 is connected to the proximal power supply, the other end of the first branch circuit 311 is connected to the first photodetector 214A, one end of the second branch circuit 312 is connected to the proximal power supply, and the other end of the second branch circuit 312 is connected to the second photodetector 214B; the first branch circuit 311 is used to supply power to the first photodetector 214A, and the second branch circuit 312 is used to supply power to the second photodetector 214B.

[0067] In this embodiment, the first photodetector 214A and the second photodetector 214B together serve as the balanced detector 214 on a single path. In practical applications, the first photodetector 214A and the second photodetector 214B need to be powered separately to maintain normal operation. Therefore, the first photodetector 214A and the second photodetector 214B are respectively connected to the first branch circuit 311 and the second branch circuit 312. In this embodiment, the first photodetector 214A and the second photodetector 214B can be mounted on the circuit board 3 in the form of surface - mount components, together serving as the balanced detector 214, and docking with the corresponding circuits.

[0068] As Figure 4 shown, the output circuit 313 specifically includes: a DC - blocking capacitor C1 and a matching resistor R1, where: one end of the DC - blocking capacitor C1 is connected to the first photodetector 214A and the second photodetector 214B, and the other end of the DC - blocking capacitor C1 is connected to the subsequent low - noise amplifier; the matching resistor R1 is connected to the first photodetector 214A and the second photodetector 214B.

[0069] In this embodiment, the matching resistor R1 provides the function of converting current into voltage, so that the current output by the balanced detector 214 is converted into a voltage signal after passing through the matching resistor R1, and the matching resistor R1 provides an impedance matching for external output. Since the balanced detector 214 itself is a high - impedance component, the output impedance characteristic of the balanced detector 214 is determined by the matching resistor R1. The DC - blocking capacitor C1 is used to ensure that there is no DC component in the output voltage signal, and only the useful AC component is retained, which is convenient for subsequent docking with the low - noise amplifier. The other end of the DC - blocking capacitor C1 extends to the outside of the package shell through circuit traces and is connected to the external subsequent low - noise amplifier.

[0070] Further, in this embodiment, considering the integration level and cost, a separate power supply is usually not provided for each balanced detector 214 of each channel. In this embodiment, the first photodetector 214A on each channel in the detection channel group 2 is connected to the positive pole of the same power supply, and the second photodetector 214B on each channel in the detection channel group 2 is connected to the negative pole of the same power supply. This design is used to reduce the occupied space of the power supply and the hardware cost. However, the resulting problem is that since the balanced detectors 214 on different channels are powered by the same power supply, radio frequency signal interference will occur between different channels, ultimately affecting the transmission performance of the optical signal. To avoid the above problems, this embodiment also involves the following design:

[0071] As Figure 4 shown, the first branch circuit 311 specifically includes: a first inductor L1 and a first capacitor C2, where: one end of the first inductor L1 is connected to the proximal power supply, and the other end of the first inductor L1 is connected to the first photodetector 214A; one end of the first inductor L1 is connected to the first photodetector 214A, and the other end of the first inductor L1 is grounded; the second branch circuit 312 specifically includes: a second inductor L2 and a second capacitor C3, where: one end of the second inductor L2 is connected to the proximal power supply, and the other end of the second inductor L2 is connected to the second photodetector 214B; one end of the second inductor L2 is connected to the second photodetector 214B, and the other end of the second inductor L2 is grounded.

[0072] In this embodiment, one end of the first inductor L1 is connected to the positive pole of the proximal power supply, and one end of the second inductor L2 is connected to the negative pole of the proximal power supply. The first inductor L1 and the second inductor L2 provide radio frequency signal isolation between different detection channels 21, performing inductive isolation at the positive and negative poles of the proximal power supply; the first capacitor C2 and the second capacitor C3 are used to configure a capacitor network at the positive and negative pole positions of the proximal power supply, thereby optimizing the flatness of the overall signal frequency band.

[0073] Further, considering that in a multi-channel integrated structure, optical crosstalk and electrical crosstalk noise usually occur between different channels, affecting the quality of optical communication. Therefore, this embodiment also involves the following design: As Figure 5 shown, the integrated multi-channel high-low noise high-speed balanced detection component further includes an isolation member 7, and the isolation member 7 is disposed on the circuit board 3; As Figure 8As shown, the spacer 7 includes a plurality of partition baffles 71 and a top plate 72. The plurality of partition baffles 71 are respectively disposed between two adjacent balance detectors 214 and between two adjacent sub-circuits; the top plate 72 is disposed at the upper ends of the plurality of partition baffles 71, and the top plate 72 is connected to the plurality of partition baffles 71. In this embodiment, one end of the top plate 72 is in contact with the side wall of the encapsulation housing 1, and the other end of the top plate 72 extends to the position where the balance detector 214 is located, and a notch is formed above the balance detector 214 to expose the balance detector 214, facilitating the input of optical signals; the partition baffles 71 and the top plate 72 are used to isolate the optical crosstalk and electrical crosstalk noise that may be generated on the circuit board.

[0074] In one embodiment, the top plate 72 and the plurality of partition baffles 71 may be integrally formed.

[0075] Embodiment 2:

[0076] On the basis of Embodiment 1, Embodiment 2 of the present invention provides another integrated multi-channel high-low noise high-speed balanced detection component. Considering that there are multiple detection channels 21 that require corresponding light source inputs, for the sake of integration, in this embodiment, multiple different light sources can be respectively coupled to different detection channels 21 in the form of an optical fiber array. Therefore, this embodiment also involves the following design:

[0077] As Figure 6 and Figure 7 shown, the integrated multi-channel high-low noise high-speed balanced detection component further includes: a first arrayed waveguide grating component 4, wherein: the first arrayed waveguide grating component 4 includes a plurality of first optical fiber channels 41, and the number of first optical fiber channels 41 in the first arrayed waveguide grating component 4 is twice the number of detection channels 21 in the detection channel group 2; every two adjacent first optical fiber channels 41 in the first arrayed waveguide grating component 4 are respectively used to transmit signal light and local oscillator light, and inside the encapsulation housing 1, every two adjacent first optical fiber channels 41 are grouped together and coupled to the input end of a corresponding mixer 211 in the detection channel group 2 for transmitting signal light and local oscillator light to the corresponding mixer 211; the pigtail of the first arrayed waveguide grating component 4 is led out from one end of the encapsulation housing 1.

[0078] In this embodiment, since each detection channel group 2 needs to receive signal light and local oscillator light, for each detection channel 21 in the detection channel group 2, it is necessary to dock with at least two light sources, one light source for inputting signal light and the other light source for inputting local oscillator light. Taking Figure 7 as an example, Figure 7There are a total of 4 detection channels 21, so there are 8 first optical fiber channels 41 in the first array grating component 4. Every two first optical fiber channels 41 form a group. In the same group, one is used to input signal light, and the other is used to input local oscillator light, and they are coupled to the mixer 211 in the same detection channel 21. The advantage of this structural design is that the light sources all adopt an external connection method, without occupying additional internal space of the structure, and the overall structural size is relatively smaller. In this embodiment, the first optical fiber channel 41 can be an optical fiber.

[0079] Embodiment 3:

[0080] Embodiment 3 of the present invention provides another integrated multi-channel high-low noise high-speed balanced detection component on the basis of Embodiment 1. Different from Embodiment 2, considering that there is no sufficient external light source to dock with all detection channels 21 in some scenarios, such as Figure 8 and Figure 9 as shown, the integrated multi-channel high-low noise high-speed balanced detection component further includes: a second array grating component 5 and a plurality of local oscillator light source components 6, wherein:

[0081] The plurality of local oscillator light source components 6 are arranged inside the packaging housing 1. The number of the plurality of local oscillator light source components 6 is the same as the number of detection channels 21 of the detection channel group 2. Each local oscillator light source component 6 is coupled to the input end of the corresponding mixer 211 for inputting local oscillator light to the corresponding mixer 211; the second array grating component 5 includes a plurality of second optical fiber channels 51. The number of second optical fiber channels 51 in the second array grating component 5 is the same as the number of detection channels 21 of the detection channel group 2. Inside the packaging housing 1, each second optical fiber channel 51 is coupled to the input end of the corresponding mixer 211 for inputting signal light to the corresponding mixer 211; the pigtail of the second array grating component 5 is led out from one end of the packaging housing 1. In this embodiment, the second optical fiber channel 51 can be an optical fiber.

[0082] In this embodiment, the array grating components in the second array grating component 5 are all used to dock with an external signal light source for transmitting signal light to each detection channel 21, and the local oscillator light source component 6 is directly arranged inside the packaging housing 1 for transmitting local oscillator light to each detection channel 21; taking Figure 9 as an example, Figure 9There are a total of 4 detection channels 21, and there are a total of 4 second optical fiber channels 51 in the second array grating component 5. Each second optical fiber channel 51 is docked with an external signal light source and is respectively coupled to the mixer 211 in the 4 detection channels 21 to transmit the signal light to the detection channel 21. A total of 4 corresponding local oscillator light source components 6 are provided for the 4 detection channels 21, and each local oscillator light source component 6 is coupled to the mixer 211 in the corresponding detection channel 21 to input local oscillator light to the mixer 211 in the corresponding detection channel 21.

[0083] Further, as Figure 10 shown, the local oscillator light source component 6 includes: a semiconductor laser 61, a collimating lens 62, an etalon 63, a reflector 64, and a converging lens 65, where:

[0084] The local oscillator light source component 6 includes: a semiconductor laser 61, a collimating lens 62, an etalon 63, a reflector 64, and a converging lens 65, where: the semiconductor laser 61, the collimating lens 62, the etalon 63, the reflector 64, and the converging lens 65 are all arranged inside the packaging shell 1. The semiconductor laser 61 is used to emit signal light, and the collimating lens 62, the etalon 63, the reflector 64, and the converging lens 65 are arranged in sequence along the optical path of the signal light emitted by the semiconductor laser 61 to couple the signal light to the input end of the corresponding mixer 211.

[0085] In this embodiment, the semiconductor laser 61 is used to emit local oscillator light, the collimating lens 62 is used to collimate the local oscillator light emitted by the semiconductor laser 61, the etalon 63 and the reflector 64 are used to form an external cavity element for compressing the line width of the laser. The etalon 63 is used to optimize the line width. While the reflector outputs most of the optical power, a small part of the optical power is fed back to the laser chip to form external cavity feedback, thereby realizing a narrow line width; the converging lens 65 is used to couple the local oscillator light to the input end of the mixer 211.

[0086] In this embodiment, since the line width output by the semiconductor laser 61 itself is about 10 MHz and cannot meet the requirements of high-precision measurement, it is necessary to add an external cavity to optimize its line width characteristics. The corresponding semiconductor laser 61 can be a distributed feedback laser (abbreviated as: DFB) or a distributed Bragg reflector laser (abbreviated as: DBR).

[0087] It should be noted that, in order to ensure the stable operation of the semiconductor laser 61 and reduce the influence on the semiconductor laser 61, a Thermo Electric Cooler (TEC) chip is provided under the semiconductor laser 61. The temperature of each semiconductor laser 61 is controlled by the TEC chip to provide an ideal temperature environment for each semiconductor laser 61.

[0088] Embodiment 4:

[0089] Based on Embodiment 1, this embodiment provides an optical module. The optical module includes the integrated multi-channel high-low noise high-speed balanced detection component in Embodiment 1. In actual use, other related components can be configured according to the specific application scenario of the optical module. For the specific structure of implementing the integrated multi-channel high-low noise high-speed balanced detection component, please refer to the previous description and will not be elaborated here.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An integrated multi-channel high-low noise high-speed balanced detection component, characterized in that, Comprising: An encapsulation housing (1), a detection channel group (2), and a circuit board (3). The detection channel group (2) and the circuit board (3) are both disposed within the encapsulation housing (1), and the output ends of the respective detection channels (21) of the detection channel group (2) are coupled to the circuit board (3); Each detection channel (21) in the detection channel group (2) includes: a mixer (211), a first stray light suppressor (212), a second stray light suppressor (213), and a balanced detector (214); the output end of the mixer (211) is respectively coupled to the first stray light suppressor (212) and the second stray light suppressor (213), both the first stray light suppressor (212) and the second stray light suppressor (213) are coupled to the balanced detector (214), and the balanced detector (214) is connected to the corresponding sub-circuit on the circuit board (3); The mixer (211) is configured to receive an input light and convert the input light into a pair of differential signals which are respectively transmitted to the first stray light suppressor (212) and the second stray light suppressor (213). The first stray light suppressor (212) and the second stray light suppressor (213) are configured to suppress noise of the corresponding differential signals and transmit the differential signals after noise suppression to the balanced detector (214). The balanced detector (214) is configured to convert the differential signals into differential mode electrical signals and transmit them to the corresponding sub-circuit on the circuit board (3).

2. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 1, wherein Each detection channel (21) in the detection channel group (2) further includes a first attenuator (215) and a second attenuator (216), wherein: The first attenuator (215) is disposed between the output end of the mixer (211) and the input end of the first stray light suppressor (212). The input end of the first attenuator (215) is coupled to the output end of the mixer (211), and the output end of the first attenuator (215) is coupled to the input end of the first stray light suppressor (212); The second attenuator (216) is disposed between the output end of the mixer (211) and the input end of the second stray light suppressor (213). The input end of the second attenuator (216) is coupled to the output end of the mixer (211), and the output end of the second attenuator (216) is coupled to the input end of the second stray light suppressor (213); Both the first attenuator (215) and the second attenuator (216) are configured to adjust the signal intensity of the differential signals.

3. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 1, characterized in that All sub-circuits on the circuit board (3) include: a first branch circuit (311), a second branch circuit (312), and an output circuit (313), wherein: The first photodetector (214A) and the second photodetector (214B) of the balanced detector (214) are respectively connected to the output circuit (313); the output circuit (313) is configured to receive the electrical signals from the first photodetector (214A) and the second photodetector (214B) and convert them into voltage signals; One end of the first branch circuit (311) is connected to the proximal power supply, and the other end of the first branch circuit (311) is connected to the first photodetector (214A). One end of the second branch circuit (312) is connected to the proximal power supply, and the other end of the second branch circuit (312) is connected to the second photodetector (214B). The first branch circuit (311) is used to supply power to the first photodetector (214A), and the second branch circuit (312) is used to supply power to the second photodetector (214B).

4. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 3, wherein The output circuit (313) specifically includes: a DC-blocking capacitor C1 and a matching resistor R1, where: One end of the DC-blocking capacitor C1 is connected to the first photodetector (214A) and the second photodetector (214B), and the other end of the DC-blocking capacitor C1 is connected to the subsequent low-noise amplifier; The matching resistor R1 is connected to the first photodetector (214A) and the second photodetector (214B).

5. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 3, wherein The first branch circuit (311) specifically includes: a first inductor L1 and a first capacitor C2, where: One end of the first inductor L1 is connected to the proximal power supply, and the other end of the first inductor L1 is connected to the first photodetector (214A); One end of the first inductor L1 is connected to the first photodetector (214A), and the other end of the first inductor L1 is grounded; The second branch circuit (312) specifically includes: a second inductor L2 and a second capacitor C3, where: One end of the second inductor L2 is connected to the proximal power supply, and the other end of the second inductor L2 is connected to the second photodetector (214B); One end of the second inductor L2 is connected to the second photodetector (214B), and the other end of the second inductor L2 is grounded.

6. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 1, wherein The integrated multi-channel high-low noise high-speed balanced detection component further includes: a first array grating component (4), where: The first array grating component (4) includes a plurality of first optical fiber channels (41), and the number of first optical fiber channels (41) in the first array grating component (4) is twice the number of detection channels (21) of the detection channel group (2); Each adjacent two first optical fiber channels (41) in the first array grating component (4) are respectively used to transmit signal light and local oscillator light. Inside the package housing (1), each adjacent two first optical fiber channels (41) are coupled to the input end of a corresponding mixer (211) in the detection channel group (2) as a group, for transmitting signal light and local oscillator light to the corresponding mixer (211); The pigtail of the first array grating component (4) is led out from one end of the package housing (1).

7. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 1, characterized in that The integrated multi-channel high-low noise high-speed balanced detection component further includes: a second array grating component (5) and a plurality of local oscillator light source components (6), where: The multiple local oscillator light source components (6) are arranged inside the encapsulation housing (1). The number of the multiple local oscillator light source components (6) is the same as the number of the detection channels (21) of the detection channel group (2). Each local oscillator light source component (6) is coupled to the input end of a corresponding mixer (211) for inputting local oscillator light to the corresponding mixer (211). The second arrayed grating component (5) includes multiple second optical fiber channels (51). The number of the second optical fiber channels (51) in the second arrayed grating component (5) is the same as the number of the detection channels (21) of the detection channel group (2). Inside the encapsulation housing (1), each second optical fiber channel (51) is coupled to the input end of a corresponding mixer (211) for inputting signal light to the corresponding mixer (211). The pigtail of the second arrayed grating component (5) is led out from one end of the encapsulation housing (1).

8. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 7, characterized in that The local oscillator light source component (6) includes: a semiconductor laser (61), a collimating lens (62), a Fabry-Perot etalon (63), a reflector (64), and a focusing lens (65), wherein: The semiconductor laser (61), the collimating lens (62), the Fabry-Perot etalon (63), the reflector (64), and the focusing lens (65) are all arranged inside the encapsulation housing (1). The semiconductor laser (61) is used for emitting signal light. The collimating lens (62), the Fabry-Perot etalon (63), the reflector (64), and the focusing lens (65) are sequentially arranged along the optical path of the signal light emitted by the semiconductor laser (61) to couple the signal light into the input end of the corresponding mixer (211).

9. The integrated multi-channel high-low noise high-speed balanced detection component according to claim 1, wherein The integrated multi-channel high-low noise high-speed balanced detection component further includes an isolation member (7). The isolation member (7) is arranged on the circuit board (3). The isolation member (7) includes multiple isolation baffles (71) and a top plate (72). The multiple isolation baffles (71) are respectively arranged between two adjacent balanced detectors (214) and between two adjacent sub-circuits. The top plate (72) is arranged at the upper ends of the multiple isolation baffles (71).

10. An optical module, characterized in that, It includes the integrated multi-channel high-low noise high-speed balanced detection component according to any one of claims 1-9.

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