Low-noise integrated optical receiving assembly and manufacturing method thereof

Abstract

The invention relates to the technical field of optical receiving assemblies, in particular to a low-noise integrated optical receiving assembly and a manufacturing method thereof.The low-noise integrated optical receiving assembly comprises a tube base, elargol and a gold thread, a transimpedance amplifier and a detector PD are pasted in the tube base through the elargol, and the transimpedance amplifier and the detector PD are in lap joint through the gold thread; a plastic adapter is fixed to the tube base and the PD through high-temperature glue in a pasted mode, an insertion block is integrally formed on the plastic adapter through injection molding, an optical fiber patch cord is arranged on the side, away from the tube base, of the plastic adapter, and a light-passing aperture is formed in the optical fiber patch cord. According to the low-noise integrated optical receiving assembly and the manufacturing method thereof, the low-pass filter with the capacitor, the resistor and the inductor is embedded in the tube socket, so that the low-noise integrated optical receiving assembly can be effectively used for filtering high-frequency noise and inhibiting power supply interference, in addition, the ceramic substrate is adopted in the tube socket, and the low-noise integrated optical receiving assembly has the advantages of being good in heat conductivity and beneficial to heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of optical receiving components, and more specifically, to a low-noise integrated optical receiving component and its manufacturing method. Background Technology

[0002] With the development of optical device technology, optical receiving devices are widely used in various optical applications such as lidar, optical communication, and satellite communication. Among them, the application of optical receivers with multiple receiving channels (ROSA) is increasing, and the packaging problem of optical receivers with multiple receiving channels has become a key research issue. Currently, there are shortcomings in the market for optical receiving devices that address the aforementioned issues. Integrated solutions for some optical receiving components have limitations. Solutions using plastic encapsulation or compact packaging have shortcomings in thermal management (e.g., TIA power consumption and heat generation) and high-frequency signal integrity (e.g., impedance matching and crosstalk). Furthermore, the current mainstream architecture uses discrete components, resulting in numerous assembly steps, high costs, and inconsistent reliability affected by multiple assembly stages. Additionally, existing plastic adapters and plastic fiber optic patch cords use injection-molded clips for secure fastening. These clips are complex in shape and small in size, making them prone to misalignment at the ends before and after assembly due to incomplete molding, leading to difficulties in insertion and removal, and the clips are also prone to falling off and failing to engage properly. Summary of the Invention

[0003] The purpose of this invention is to provide a low-noise integrated optical receiver component and its manufacturing method, so as to solve the problems mentioned in the background art, in which existing optical receiver components are difficult to meet the functional requirements in terms of impedance matching, thermal management, production efficiency and convenient assembly.

[0004] To achieve the above objectives, the present invention provides a low-noise integrated optical receiver component and its manufacturing method, comprising a socket, silver paste, and gold wire. A transimpedance amplifier and a detector (PD) are bonded inside the socket with silver paste. The transimpedance amplifier and the detector (PD) are connected by gold wire. A plastic adapter is bonded and fixed between the socket and the detector (PD) with high-temperature adhesive. The plastic adapter has a plug integrally formed by injection molding. An optical fiber patch cord is located on the side of the plastic adapter away from the socket, and the optical fiber patch cord has a light-transmitting aperture inside, through which a ceramic ferrule is connected. A quick-locking mechanism for fixing and locking the position of the plastic adapter is provided on the side of the optical fiber patch cord near the plastic adapter.

[0005] As a preferred embodiment of the present invention, the tube socket integrates a signal transmission line with a stripline structure.

[0006] As a preferred embodiment of the present invention, a low-pass filter with capacitor, resistor and inductor is provided on one side of the tube socket to filter out high-frequency noise and suppress power supply interference.

[0007] As a preferred embodiment of the present invention, the tube seat is made of a ceramic substrate material with good thermal conductivity.

[0008] As a preferred embodiment of the present invention, the quick-locking mechanism includes an installation groove and a positioning post. The installation groove is provided on the inner side of the fiber optic patch cord, and a positioning post is provided inside the installation groove. An L-shaped positioning block is hinged to the outer wall of the positioning post. A sliding groove is provided inside the installation groove, and a T-shaped positioning block is provided inside the sliding groove. A first rigid spring connected to the installation groove is sleeved on the outer wall of the T-shaped positioning block.

[0009] As a preferred embodiment of the present invention, an L-shaped lever block that penetrates the optical fiber jumper is provided on the side of the L-shaped positioning block away from the T-shaped positioning block, and a second rigid spring is provided on the side of the L-shaped positioning block away from the L-shaped lever block, with the bottom end of the second rigid spring connected to the mounting groove.

[0010] As a preferred embodiment of the present invention, a limiting hole is formed inside the insert block, and the outer wall of the L-shaped positioning block is inserted into the limiting hole for fixed engagement.

[0011] As a preferred embodiment of the present invention, the three-dimensional stacking and packaging steps at the tube socket position are as follows: S1: Using the die bond SMT process, silver paste is used to sequentially attach the transimpedance amplifier, low-pass filter and detector PD to the socket. After high temperature baking, gold wire bonding is completed by a soldering machine to complete the TO package. S2: Place the vibrating turntable in position using the plastic adapter, then turn on the vibrating turntable to drive the plastic adapters to be neatly placed into the material tray in the specified direction; S3: Apply high-temperature adhesive to the outer edge of the tube seat using an automatic dispensing system; S4: Using the image recognition function of the pick-and-place machine, identify the center position of the photosensitive surface at the detector PD of the tube socket and the position of the optical port of the ceramic ferrule of the plastic adapter, and complete the alignment and mounting of the photosensitive surface and the optical port of the plastic adapter using a high-precision pick-and-place machine. S5: According to the light emission angle of the ceramic ferrule inside the fiber optic patch cord, fix the distance between the photosensitive surface of the detector PD and the ceramic ferrule at the plastic adapter so that the external light source is fully received by the photosensitive surface of the detector PD. S6: Finally, the automatic dispensing machine applies glue, bakes, and fixes the component, completing the ROSA encapsulation of the optical receiver.

[0012] As a preferred embodiment of the present invention, the process of step S1 requires that the concentricity between the tube socket and the detector PD3 be within ±15um.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This low-noise integrated optical receiver component: The signal transmission line with a stripline structure is integrated in the tube socket and has characteristic impedance. By embedding a low-pass filter with capacitance, resistance and inductance at the tube socket, it can be effectively used to filter out high-frequency noise and suppress power supply interference. In addition, the tube socket uses a ceramic substrate, which has the advantages of good thermal conductivity and heat dissipation. 2. This low-noise integrated optical receiving component: The operator inserts the plug at the plastic adapter into the mounting slot, and the plug presses against the L-shaped positioning block, causing the L-shaped positioning block to press against the second rigid spring to one side until the plug is pressed against the T-shaped positioning block. Under the elastic action of the T-shaped positioning block, the position of the limiting groove of the plug can be aligned with the position of the L-shaped positioning block. Then, under the elastic action of the second rigid spring, the L-shaped positioning block is engaged into the limiting groove inside the plug, thus completing the quick engagement and fixation.

[0014] 3. The low-noise integrated optical receiving component and its manufacturing method: reduces the product's BOM cost and manufacturing cost, including personnel input, equipment input and electricity cost. In addition, it has high production efficiency: fully automated surface mount packaging, visual recognition fully automated production, production efficiency can be increased by more than 20 times, and the production yield is high. Through automated visual surface mount baking and fixing, the first-pass yield and finished product rate are high. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the tube seat and plastic adapter of the present invention; Figure 3 For the present invention Figure 1 A magnified structural diagram of part A; Figure 4 This is a schematic diagram of the three-dimensional structure of the L-shaped positioning block and the L-shaped lever block of the present invention. Figure 5 This is a schematic diagram of the L-shaped positioning block flipping structure of the present invention; Figure 6 This is a schematic diagram of the optical path return image of the fiber optic patch cord of the present invention.

[0016] The meanings of the labels in the diagram are as follows: 1. Tube socket; 2. Transimpedance amplifier; 3. Detector (PD); 4. Silver paste; 5. Gold wire; 6. Plastic adapter; 7. Light-transmitting aperture; 8. Ceramic ferrule; 9. Low-pass filter; 10. Fiber optic patch cord; 1001. Mounting slot; 1002. Positioning post; 1003. Slide groove; 1004. T-shaped positioning block; 1005. L-shaped positioning block; 1006. First rigid spring; 1007. L-shaped lever; 1008. Second rigid spring; 11. Insert block. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a low-noise integrated optical receiver component and its manufacturing method, such as... Figure 1 As shown, the device includes a tube socket 1, silver paste 4, and gold wire 5. Inside the tube socket 1, a transimpedance amplifier 2 and a detector PD3 are attached by the silver paste 4. The transimpedance amplifier 2 and the detector PD3 are connected by the gold wire 5. A low-pass filter 9 with capacitors, resistors, and inductors is provided on one side of the tube socket 1 to filter out high-frequency noise and suppress power supply interference. By embedding the low-pass filter 9 with capacitors, resistors, and inductors at the tube socket 1, it can be effectively used to filter out high-frequency noise and suppress power supply interference.

[0019] Furthermore, the tube socket 1 integrates a stripline signal transmission line. The tube socket 1 is made of a ceramic substrate material with good thermal conductivity. The integrated stripline signal transmission line in the tube socket 1 has characteristic impedance, thus achieving controlled 50Ω impedance matching from the TIA output to the RF pin Ganged. In addition, the use of a ceramic substrate in the tube socket 1 has the advantages of good thermal conductivity and heat dissipation.

[0020] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A plastic adapter 6 is attached to the tube base 1 and detector PD3 using high-temperature adhesive. The plastic adapter 6 has a plug 11 formed by injection molding. A fiber optic patch cord 10 is located on the side of the plastic adapter 6 away from the tube base 1, and the fiber optic patch cord 10 has an internal light-transmitting aperture 7, through which a ceramic ferrule 8 is connected. A quick-locking mechanism for fixing the position of the plastic adapter 6 is provided on the side of the fiber optic patch cord 10 near the plastic adapter 6. The quick-locking mechanism includes a mounting groove 1001 and a positioning post 1002. The mounting groove 1001 is located on the inner side of the fiber optic patch cord 10, and the positioning post 1002 is located inside the mounting groove 1001. An L-shaped positioning block 1005 is hinged to the outer wall of mounting groove 1001. A sliding groove 1003 is provided inside the mounting groove 1001, and a T-shaped positioning block 1004 is provided inside the sliding groove 1003. A first rigid spring 1006 connected to the mounting groove 1001 is sleeved on the outer wall of the T-shaped positioning block 1004. An L-shaped lever 1007 passing through the fiber optic patch cord 10 is provided on the side of the L-shaped positioning block 1005 away from the T-shaped positioning block 1004. A second rigid spring 1008 is provided on the side of the L-shaped positioning block 1005 away from the L-shaped lever 1007. The bottom end of the second rigid spring 1008 is connected to the mounting groove 1001. The outer wall of the first rigid spring 1006... The wall sleeve is equipped with a second rigid spring 1008 connected to the L-shaped lever 1007. A limiting hole is formed inside the insert 11. The outer wall of the L-shaped positioning block 1005 is inserted into the limiting hole for fixed engagement. The operator inserts the insert 11 from the plastic adapter 6 into the mounting slot 1001. The insert 11 presses against the L-shaped positioning block 1005, causing the L-shaped positioning block 1005 to press against the second rigid spring 1008 to one side, until the insert 11 is pressed against the T-shaped positioning block 1004. Under the elastic action of the T-shaped positioning block 1004, the limiting groove of the insert 11 can be aligned with the position of the L-shaped positioning block 1005, thereby engaging the second rigid spring 1008. Under the elastic action, the L-shaped positioning block 1005 engages with the inner limiting groove of the insert block 11, thereby completing the quick engagement and fixation. When it is necessary to disengage, one side of the L-shaped lever 1007 can be pressed, and the L-shaped lever 1007 presses the second rigid spring 1008 at the L-shaped positioning block 1005, thereby moving the L-shaped positioning block 1005 away from the limiting groove position of the insert block 11. At this time, the plastic adapter 6 can be pulled outward to complete the disengagement action. This structure improves the convenience and reliability of engagement. Existing injection-molded buckles are prone to misalignment at both ends before and after assembly due to incomplete injection molding, making insertion and removal very difficult, and they are also prone to falling off and failing to engage.

[0021] In this embodiment, as Figure 6 As shown, the three-dimensional stacking and packaging steps for the tube socket 1 and the plastic adapter 6 are as follows: S1: Using the die bond SMT process, silver paste 4 is used to attach the transimpedance amplifier 2, low-pass filter 9 and detector PD3 to the socket 1 in sequence. After high temperature baking, the gold wire 5 is connected by a soldering machine to complete the TO package. Step S1.1: The process requires that the concentricity of the tube socket 1 and the detector PD3 be within ±15um; S2: Position the vibrating turntable machine using the plastic adapter 6, then turn on the vibrating turntable to drive the plastic adapter 6 to be neatly placed into the material tray in the specified direction; S3: Apply high-temperature adhesive to the outer edge of tube seat 1 using an automatic dispensing system; S4: Using the image recognition function of the pick-and-place machine, identify the center position of the photosensitive surface of the detector PD3 at the position of the tube socket 1 and the position of the optical port of the ceramic ferrule 8 of the plastic adapter 6, and complete the centering and mounting of the photosensitive surface and the optical port of the plastic adapter 6 using a high-precision pick-and-place machine. S5: According to the light output angle information of the ceramic ferrule 8 inside the fiber optic patch cord 10, the distance between the photosensitive surface of the detector PD3 and the ceramic ferrule 8 at the plastic adapter 6 is fixed, so that the external light source is completely received by the photosensitive surface of the detector PD3. S6: Finally, the automatic dispensing machine applies glue, bakes, and fixes the component, completing the ROSA encapsulation of the optical receiver.

[0022] Existing TO (Transfer Adapter) packaging costs are high, requiring a converging lens cap and involving numerous production steps. Furthermore, the coupling efficiency between the TO and adapter is low. UV adhesive pre-fixation followed by high-temperature structural adhesive baking results in a long production cycle and high cost. Additionally, UV adhesive pre-fixation can lead to coupling misalignment if the TO package is eccentric, or asymmetrical UV adhesive application can cause asymmetrical tensile forces during baking. This asymmetrical tensile forces can cause displacement of the product during high-temperature baking, resulting in a lower response current than required. This patent application addresses cost reduction by lowering the product's BOM (Bill of Materials) and manufacturing costs, including personnel, equipment, and electricity costs. Moreover, it offers high production efficiency: fully automated surface mount packaging with visual recognition enables over 20 times higher production efficiency, and the automated visual surface mount baking process further enhances yield.

[0023] Working process: Using the die bond SMT process, silver paste 4 is used to attach the transimpedance amplifier chip 2, the detector chip PD3, and the low-pass filter 9, which filters out high-frequency noise and suppresses power supply interference, onto the tube socket 1 in sequence. After high-temperature baking, the gold wire 5 is connected by a soldering machine. At this point, the receiver TO is packaged. Similarly, this process requires that the concentricity between the PD photosensitive surface and the tube socket be within ±15um. The optimized plastic adapter 6 is automatically and neatly arranged in the material tray according to the specified direction under the action of the vibrating turntable. High-temperature structural adhesive is automatically applied to the outer edge of tube socket 1. The chip mounter uses image recognition to identify the center of the photosensitive surface of the detector PD3 of the tube socket and the optical port of the ceramic ferrule 8 of the plastic adapter 6, and completes the centering and mounting of the photosensitive surface and the optical port of the ceramic ferrule 8 adapter. The optimized receiver optical component, according to the light output angle information of the ceramic ferrule 8 inside the fiber optic patch cord 10, has a fixed distance between the photosensitive surface of the detector PD3 and the ceramic ferrule 8, so that the external light source is completely received by the photosensitive surface of the detector PD3. High-temperature baking for fixation, automatic dispensing machine for additional glue application and baking for fixation, and testing; at this point, the ROSA optical receiver component has completed its encapsulation. Next, assemble the fiber optic patch cord 10 with the plastic adapter 6. The operator inserts the plug 11 from the plastic adapter 6 into the mounting slot 1001, causing the plug 11 to press against the L-shaped positioning block 1005. This causes the L-shaped positioning block 1005 to press against the second rigid spring 1008 to one side until the plug 11 is pressed against the T-shaped positioning block 1004. Under the elastic action of the T-shaped positioning block 1004, the limiting groove of the plug 11 can be aligned with the position of the L-shaped positioning block 1005. Then, under the elastic action of the second rigid spring 1008, the L-shaped positioning block 1005 is engaged inside the limiting groove of the plug 11, thus completing the quick assembly. The locking mechanism is designed to allow for easy and reliable disengagement. When it is necessary to disconnect the fiber optic patch cord 10 from the plastic adapter 6, the L-shaped lever 1007 on one side can be pressed. The L-shaped lever 1007 presses the second rigid spring 1008 at the L-shaped positioning block 1005, causing the L-shaped positioning block 1005 to move away from the limiting groove at the insertion block 11. At this point, the plastic adapter 6 can be pulled outward to complete the disengagement. This structure improves the convenience and reliability of locking. Compared with existing injection-molded buckles, injection-molded buckles are prone to misalignment at both ends before and after assembly due to incomplete molding, making insertion and removal very difficult. They are also prone to falling off and failing to lock.

[0024] By embedding a low-pass filter 9 with capacitance, resistance and inductance at the tube socket 1, it can be effectively used to filter out high-frequency noise and suppress power supply interference.

[0025] The socket 1 is made of a ceramic substrate material with good thermal conductivity. A signal transmission line with a stripline structure is integrated in the socket 1. It has characteristic impedance, which realizes controlled 50Ω impedance matching from the TIA output to the RF pin Ganged. In addition, the use of a ceramic substrate in the socket 1 has the advantages of good thermal conductivity and heat dissipation.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-noise integrated optical receiving component, comprising a socket (1), silver paste (4), and gold wire (5), characterized in that: The transimpedance amplifier (2) and detector PD (3) are attached inside the tube socket (1) with silver paste (4). The transimpedance amplifier (2) and detector PD (3) are connected by gold wire (5). A plastic adapter (6) is attached to the tube socket (1) and detector PD (3) with high temperature glue. The plastic adapter (6) has a plug (11) formed by injection molding. There is an optical fiber patch cord (10) on the side of the plastic adapter (6) away from the tube socket (1). The optical fiber patch cord (10) has a light-transmitting aperture (7) inside. The ceramic ferrule (8) is connected through the light-transmitting aperture (7). A quick-locking mechanism for fixing and locking the position of the plastic adapter (6) is provided on the side of the optical fiber patch cord (10) near the plastic adapter (6).

2. The low-noise integrated optical receiver component according to claim 1, characterized in that: The tube seat (1) has a signal transmission line with a stripline structure integrated inside.

3. The low-noise integrated optical receiving component according to claim 1, characterized in that: A low-pass filter (9) with capacitance, resistance and inductance is provided on one side of the tube socket (1) to filter out high-frequency noise and suppress power supply interference.

4. The low-noise integrated optical receiving component according to claim 1, characterized in that: The tube base (1) is made of a ceramic substrate material with good thermal conductivity.

5. The low-noise integrated optical receiver component according to claim 1, characterized in that: The quick-locking mechanism includes a mounting groove (1001) and a positioning post (1002). The mounting groove (1001) is provided on the inner side of the fiber optic patch cord (10), and the positioning post (1002) is provided inside the mounting groove (1001). An L-shaped positioning block (1005) is hinged to the outer wall of the positioning post (1002). A sliding groove (1003) is provided inside the mounting groove (1001), and a T-shaped positioning block (1004) is provided inside the sliding groove (1003). A first rigid spring (1006) connected to the mounting groove (1001) is sleeved on the outer wall of the T-shaped positioning block (1004).

6. The low-noise integrated optical receiver component according to claim 5, characterized in that: The L-shaped positioning block (1005) is provided with an L-shaped lever (1007) through which the optical fiber jumper (10) passes on the side away from the T-shaped positioning block (1004). A second rigid spring (1008) is provided on the side of the L-shaped positioning block (1005) away from the L-shaped lever (1007). The bottom end of the second rigid spring (1008) is connected to the mounting groove (1001).

7. The low-noise integrated optical receiver component according to claim 5, characterized in that: The insert (11) has a limiting hole inside, and the outer wall of the L-shaped positioning block (1005) is inserted into the limiting hole for fixed engagement.

8. A method for manufacturing a low-noise integrated optical receiver according to any one of claims 1-7, characterized in that: The three-dimensional stacking and packaging steps at the tube socket (1) position are as follows: S1: Using the die bond SMT process, silver paste (4) is used to attach the transimpedance amplifier (2), low-pass filter (9) and detector PD (3) to the socket (1) in sequence. After high temperature baking, the gold wire (5) is connected by a soldering machine to complete the TO package. S2: Place the vibrating turntable in position using the plastic adapter (6), then turn on the vibrating turntable to drive the plastic adapter (6) to be neatly placed into the material tray in the specified direction; S3: Apply high-temperature glue to the outer edge of the tube seat (1) using an automatic applicator; S4: Using the image recognition function of the pick and place machine, identify the center position of the photosensitive surface of the detector PD (3) at the position of the tube socket (1) and the position of the optical port of the ceramic ferrule (8) of the plastic adapter (6), and complete the alignment and mounting of the photosensitive surface and the optical port of the plastic adapter (6) by the high-precision pick and place machine. S5: According to the light output angle information of the ceramic ferrule (8) inside the fiber optic patch cord (10), fix the distance between the photosensitive surface of the detector PD (3) and the ceramic ferrule (8) at the plastic adapter (6) so that the external light source is fully received by the photosensitive surface of the detector PD (3). S6: Finally, the automatic dispensing machine applies glue, bakes, and fixes the component, completing the ROSA encapsulation of the optical receiver.

9. The method for manufacturing the low-noise integrated optical receiver assembly according to claim 8, characterized in that: The process requirement for step S1 is that the concentricity of the tube socket (1) and the detector PD (3) must be within ±15um.

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