Optical fiber beam splitter packaging structure and VCSEL comprising same

Abstract

The invention relates to the technical field of optical communication, in particular to an optical fiber beam splitter packaging structure and a VCSEL comprising the same. The optical fiber beam splitter packaging structure comprises an optical fiber beam splitter body, a buffer layer, a heat conduction layer and a rigid layer, the buffer layer wraps the optical fiber beam splitter body, the heat conduction layer wraps the buffer layer, and the rigid layer wraps the heat conduction layer. The buffer layer absorbs mechanical stress, absorbs shock, prevents impact, and protects the optical fiber beam splitter body from being damaged by external mechanical force; the heat conduction layer is used for heat dissipation, and it is ensured that the optical fiber beam splitter body can effectively conduct out heat in a high-power or high-temperature environment. The rigid layer improves the physical strength, prevents external impact, extrusion or wear, and ensures the mechanical stability and durability of the whole packaging structure. Starting from the two aspects of mechanics and thermotics, the optical fiber beam splitter packaging structure is optimized, so that the optical fiber beam splitter body generates a stable beam splitting ratio, finally, the VCSEL generates stable output, and the VCSEL has a good application prospect in the technical field of optical communication.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to an optical fiber beam splitter packaging structure and a VCSEL including the same. Background Art

[0002] The stable operation of VCSEL (Vertical Cavity Surface Emitting Laser) is of great significance in many applications. First, the reliability of VCSEL is the basis for its wide application. Stable operation extends the service life of the device and reduces maintenance and replacement costs, thereby ensuring the long-term reliability of the system. Second, the stable VCSEL output light intensity and wavelength ensure the consistency and accuracy of the system performance, which is crucial for high-precision measurement and data transmission.

[0003] In optical communication systems, the stable operation of VCSEL plays an important role in reducing bit error rates and improving data transmission speed and quality. In addition, stable VCSEL operation helps optimize thermal management and prevent performance degradation or device failure due to overheating. Energy consumption management is also an important aspect of stable operation. Through stable operation, energy consumption can be optimized, the energy efficiency of the system can be improved, and power consumption can be reduced.

[0004] Factors that affect the temperature operation of VCSEL include current injection, heat dissipation design, ambient temperature, packaging method and operating frequency. The injection current directly affects the heat generation of VCSEL. Too high current will cause overheating, while too low current may not achieve the required luminous intensity. Heat dissipation design and material selection are crucial to temperature control. Good heat dissipation design can effectively reduce heat accumulation. Changes in external ambient temperature will affect the operating temperature of VCSEL. High ambient temperature may cause heat dissipation difficulties and increase device temperature. Package design affects heat dissipation performance. Good packaging can improve thermal conductivity and enhance heat dissipation. Operating frequency will also affect heat generation. High frequency operation will lead to more heat accumulation.

[0005] The stable operation of VCSEL can be effectively achieved through optical feedback control. Use a light detector (such as a photodiode) to detect the output light intensity of VCSEL in real time, and feed the signal back to the control unit to ensure the stability of the output light intensity by adjusting the injection current. Design a feedback circuit, including an amplifier, a comparator, and a regulation circuit. After the output signal of the light detector is amplified, it is compared with the reference signal to generate an error signal. The control unit adjusts the injection current of the VCSEL according to the feedback signal to ensure the stability of the output light intensity.

[0006] Fiber optic beam splitters are usually used to split part of the VCSEL output light onto a photodetector, monitor the laser output power in real time, and automatically adjust the changes caused by power fluctuations through feedback signals, thereby compensating for the impact of various fluctuations on the laser power. Fiber optic beam splitters are easy to integrate into the VCSEL output path, reducing the need for external optical components and simplifying the entire system design. Compared to using multiple independent optical path monitoring and adjustment solutions, fiber optic beam splitters combined with feedback control can achieve the same function while maintaining a smaller size.

[0007] When the output power of VCSEL is high, the temperature of the fiber beam splitter rises, and the refractive index of the fiber or waveguide material changes, causing the distribution ratio (splitting ratio) of the optical signal inside the fiber beam splitter to change. In addition, the temperature increase also causes slight changes in the geometric dimensions of the optical fiber, such as thermal expansion of the optical fiber, which affects the distribution of the optical signal and ultimately affects the light intensity of the feedback signal, which in turn affects the feedback control of the VCSEL, resulting in instability in the regulation drive circuit and affecting the output power of the VCSEL. Summary of the invention

[0008] To solve the above problems, the present invention provides, on the one hand, a fiber optic splitter packaging structure, including a fiber optic splitter body, a buffer layer, a thermal conductive layer and a rigid layer. The fiber optic splitter body is a fused-taper fiber optic splitter, the buffer layer covers the fiber optic splitter body, the thermal conductive layer covers the buffer layer, and the rigid layer covers the thermal conductive layer.

[0009] A fused-tapered fiber splitter is a splitter that achieves optical signal distribution by heating and stretching optical fibers. When making a fused-tapered fiber splitter, two or more optical fibers are heated to a softening point and then stretched under controlled conditions to form a tapered region. In this tapered region, the optical signal is evenly or unevenly distributed to different output optical fibers through the coupling effect of the optical fiber. The fused-tapered fiber splitter has a compact structure and low loss, and is suitable for application in VCSEL. In the fiber splitter packaging structure of the present application, the buffer layer absorbs mechanical stress, reduces shock and prevents impact, protects the fiber splitter body from damage by external mechanical forces, reduces the stress caused by mechanical vibration, bending or external impact transmitted to the optical fiber core, and maintains the stability of the splitting ratio; the thermal conductive layer is used for heat dissipation to ensure that the fiber splitter body can effectively export heat in a high-power or high-temperature environment to prevent overheating from affecting the performance of the fiber splitter body; the rigid layer improves the physical strength, prevents external impact, extrusion or wear, and ensures the mechanical stability and durability of the entire packaging structure. The present application optimizes the packaging structure of the optical fiber beam splitter from the perspectives of mechanics and thermals, so that the optical fiber beam splitter body produces a stable splitting ratio, and ultimately the VCSEL produces a stable output.

[0010] Furthermore, the material of the buffer layer is silicone. Silicone has good flexibility and elasticity, and can effectively absorb external mechanical vibration, impact and physical stress, and prevent the optical fiber from being affected by external forces and affecting the splitting ratio. The material of the heat-conducting layer is thermally conductive silicone. Thermally conductive silicone has good thermal conductivity and is flexible. It can effectively conduct heat while maintaining softness, and transfer the heat generated during the operation of the optical fiber splitter body to the outer layer to avoid overheating problems. The material of the rigid layer is stainless steel. Stainless steel has extremely high mechanical strength and can provide solid external protection for the optical fiber splitter body. In addition, stainless steel has good thermal conductivity, which further protects the normal operation of the optical fiber splitter body.

[0011] In the structure of the optical fiber splitter, the coupling area and the core area are two key areas, and their functions and heat distribution are different. The coupling area refers to the area where the optical signal is distributed and coupled in the optical fiber splitter. It is the part where the optical fiber is melted and tapered. The optical signal is transmitted from one optical fiber to multiple optical fibers through the geometric changes and mutual coupling of the optical fiber in the coupling area. The splitting ratio of the optical signal is mainly determined in the coupling area. The core area refers to the part where the optical signal in the optical fiber splitter is mainly transmitted. It is the stable section of the optical fiber splitter. The optical fiber has no obvious shape change. The optical signal propagates along the core of the optical fiber without coupling or splitting. In the coupling area, during the process of the optical signal being transmitted from one optical fiber to multiple optical fibers, part of the optical energy will be lost due to the coupling between the optical fibers. The lost optical energy is released in the form of heat energy. The shape of the optical fiber in the coupling area becomes more complex and delicate due to the taper process, resulting in a decrease in thermal conductivity. In addition, the multiple reflections and splitting of the optical signal in this area make it easier for heat to accumulate in this area. On the contrary, in the core area, the optical signal propagates along the core of the optical fiber, with almost no energy loss or geometric structure change, so the heat generated in the core area is relatively small. In the coupling area of ​​the fiber beam splitter body, the buffer layer is thick and the thermal conductive layer is thin; using a thinner thermal conductive layer helps to quickly transfer heat, while a thicker buffer layer can absorb mechanical stress and prevent external vibration or pressure from affecting the optical performance of the coupling area. In the core area of ​​the fiber beam splitter body, the buffer layer is thin and the thermal conductive layer is thick; using a thinner buffer layer reduces heat isolation, while a thicker thermal conductive layer can better dissipate heat and keep the temperature of the core area stable. This regionalized design optimizes different functional areas according to heat requirements and mechanical stress characteristics, making the overall structure more reasonable.

[0012] On the other hand, the present invention provides a VCSEL, which includes a VCSEL body and the above-mentioned fiber beam splitter packaging structure. In addition to the VCSEL body and the above-mentioned fiber beam splitter packaging structure, it also includes a first optical fiber, a second optical fiber, a light detector, and a feedback control unit. The VCSEL body emits a laser, which is coupled into one end of the first optical fiber, and the other end of the first optical fiber is connected to the fiber beam splitter body. After the laser is split by the fiber beam splitter body, it is connected to one end of the second optical fiber, and the other end of the second optical fiber is connected to the light detector. The feedback control unit connects the light detector and the VCSEL body, and the feedback control unit adjusts the working point of the VCSEL body according to the electrical signal of the light detector.

[0013] The present application uses a beam splitter packaging structure to stably split the laser output by the VCSEL body into multiple beams, the ratio of which has been accurately set and calibrated during manufacturing. Therefore, the fiber beam splitter packaging structure can provide a stable and predictable light intensity distribution, ensuring that part of the light intensity is used for the main application and the other part of the light intensity is used for feedback control. This stability ensures the accuracy of the feedback signal, thereby ensuring the stable output of the VCSEL body.

[0014] Furthermore, the laser emitted by the VCSEL body is coupled into the first optical fiber by means of optical fiber alignment, and the optical fiber beam splitter body is a 2×2 beam splitter.

[0015] Furthermore, the splitting ratio of the optical fiber splitter body is 90:10, and a small amount of light is coupled into the second optical fiber.

[0016] Furthermore, the optical fiber beam splitter packaging structure is placed in a sealed box.

[0017] Furthermore, the first optical fiber and the second optical fiber pass through the sealing box, and the first optical fiber and the second optical fiber are connected to the optical fiber splitter packaging structure in the sealing box.

[0018] Furthermore, the optical fiber beam splitter packaging structure is fixed by a metal bracket fixed to the inner surface of the sealing box.

[0019] Beneficial effects of the present invention: (1) The present invention uses silica gel as a buffer layer, which can effectively absorb external mechanical vibration and impact, prevent external pressure from causing stress transmission to the core and coupling area of ​​the optical fiber splitter, and ensure that the splitting ratio is not affected by mechanical factors. The stainless steel material of the rigid layer provides good structural strength and impact resistance, ensuring the mechanical stability of the optical fiber splitter and VCSEL overall system in high vibration or harsh environments, and extending the service life of the system.

[0020] (2) The present invention uses the regional design of the optical fiber beam splitter coupling area and core area to effectively dissipate heat and reduce the fluctuation of the splitting ratio caused by temperature rise. The optimized design of the thermal conductive layer and the buffer layer ensures the heat dissipation effect in different areas, avoids the influence of uneven temperature on the performance of the optical fiber beam splitter body, and ultimately improves the output power stability of the VCSEL. This design effectively solves the problem of heat management during high-power operation, allowing the VCSEL to work stably under high temperature or harsh environment. (3) The present invention uses an optical fiber beam splitter to split the laser part of the VCSEL output to the optical detector to achieve real-time power feedback. The feedback control unit adjusts the working point of the VCSEL according to the electrical signal of the detector to maintain the stability of the output power. This design reduces output power fluctuations, avoids signal distortion caused by temperature or mechanical factors, ensures high-quality transmission of optical signals, and is suitable for use in high-precision optical communication and sensing systems.

[0021] (4) The present invention places the optical fiber splitter packaging structure in a sealed box. The sealed box provides a stable environmental condition, which helps to reduce the impact of stability or humidity changes on the optical fiber splitter body, so that the optical fiber splitter body provides a stable splitting ratio. In addition, the sealed box isolates the physical contact between the optical fiber splitter packaging structure and the external environment, reduces the impact of mechanical vibration or collision on the optical fiber splitter, and helps the optical fiber splitter provide a stable splitting ratio.

[0022] (5) The metal bracket used in the present invention is easy to dissipate heat, and conducts the heat generated by the optical fiber splitter body to the inner surface of the sealing box, thereby reducing the temperature of the optical fiber splitter body and ensuring that the optical fiber splitter body provides a stable splitting ratio.

[0023] Based on the above beneficial effects, the present invention has good application prospects in the field of optical communication technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the packaging structure of a fiber optic beam splitter.

[0025] Figure 2 A schematic diagram of a VCSEL including a fiber beam splitter packaging structure.

[0026] In the figure: 1. Fiber optic beam splitter body; 2. Buffer layer; 3. Heat conducting layer; 4. Rigid layer. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0028] Example 1 The present invention provides a fiber optic beam splitter packaging structure, such as Figure 1 As shown, it includes a fiber beam splitter body 1, a buffer layer 2, a heat conductive layer 3 and a rigid layer 4. The fiber beam splitter body 1 is a fused tapered fiber beam splitter, which uses high-purity quartz material to ensure low loss and stability in optical signal transmission. This is because quartz material has high thermal stability, which helps to maintain the splitting ratio at high temperatures. The tapered part of the fused tapered fiber beam splitter is a uniformly gradient cone, which ensures uniform distribution of optical signals during the coupling process. The length of the tapered area is 1-2 cm, and the taper angle is 5-15 degrees. The material of the buffer layer 2 is silicone or thermally conductive silicone. The buffer layer 2 covers the fiber beam splitter body 1. The silicone has good flexibility and elasticity, can absorb mechanical vibration and external impact, and protect the fiber beam splitter body 1 from external mechanical forces. Silicone also has a moderate thermal conductivity and can transfer heat to a certain extent. The material of the thermal conductive layer 3 is thermally conductive silicone. The heat-conducting layer 3 covers the buffer layer 2. The thermal conductivity of the heat-conducting silica gel is 1-5W / m·K. It has flexibility and high thermal conductivity, and can export the heat of the optical fiber beam splitter body 1 while maintaining a certain mechanical flexibility. The material of the rigid layer 4 is stainless steel, and the rigid layer 4 covers the heat-conducting layer 3. The overall packaging structure is cylindrical, matching the shape of the optical fiber beam splitter body 1. Preferably, the outer surface of the rigid layer 4 is provided with heat dissipation fins to increase the heat dissipation area and improve the heat dissipation effect.

[0029] During preparation, each layer of material is tightly wrapped around the optical fiber beam splitter body 1, so as to produce good heat conduction and mechanical protection. The buffer layer 2, the heat conductive layer 3 and the rigid layer 4 are fixed on the optical fiber beam splitter body by a press molding process. A flexible adhesive or a high thermal conductive silicone is used between the heat conductive layer 3 and the buffer layer 2 to reduce thermal resistance.

[0030] When in use, standard optical fiber fusion splicing or mechanical connectors are used for coupling to reduce optical coupling losses and maintain the stability of the mechanical structure.

[0031] Furthermore, in the coupling area of ​​the optical fiber beam splitter body 1, the buffer layer 2 is thick and the heat conductive layer 3 is thin; in the core area of ​​the optical fiber beam splitter body 1, the buffer layer 2 is thin and the heat conductive layer 3 is thick. Specifically, in the coupling area, the thickness of the buffer layer 2 is 1-2mm, which has a good mechanical buffering effect to prevent external vibration and stress from affecting the splitting ratio, and the thickness of the heat conductive layer 3 is 0.5-1mm, ensuring that the heat can be quickly discharged to prevent local heat accumulation from causing changes in the splitting ratio; in the core area, the thickness of the buffer layer 2 is 0.5-1mm, and the thickness of the heat conductive layer 3 is 1-2mm. The thickness of the rigid layer is maintained at about 1-2mm.

[0032] The fiber beam splitter packaging structure effectively solves the heat dissipation problem under high-power operation by optimizing materials, size, shape and connection methods. The silicone buffer layer 2 with appropriate thickness provides good mechanical protection, the thermal conductive silicone thermal conductive layer 3 ensures the effective heat dissipation, and the stainless steel rigid layer 4 provides solid external protection and heat dissipation. Combined with the regional design of the coupling area and the core area, the temperature rise of the fiber beam splitter body can be reduced while maintaining the stability of the splitting ratio, ensuring the stable output of the VCSEL system.

[0033] Example 2 The present invention provides a VCSEL, such as Figure 2 As shown, it includes a VCSEL body, a first optical fiber, a second optical fiber, a light detector, a feedback control unit, and an optical fiber splitter packaging structure. The light emission wavelength of the VCSEL body can be 850 nanometers, 940 nanometers, 1310 nanometers, and 1550 nanometers; when used for short-distance high-speed data transmission, 850 nanometers and 940 nanometers are used; when used for long-distance communication, 1310 nanometers and 1550 nanometers are used. Selecting a VCSEL body with good beam quality, including a small divergence angle and a uniform light spot, helps to improve the fiber coupling efficiency and system performance.

[0034] The VCSEL body emits a laser, which is coupled into one end of the first optical fiber. The first optical fiber is a single-mode optical fiber (SMF) with low loss and dispersion, capable of transmitting long-distance signals and maintaining signal quality. The first optical fiber adopts Corning SMF-28 Ultra, which has low attenuation and high stability. The laser can be coupled into the first optical fiber using a coupling lens, including a spherical lens, a cylindrical lens, a GRIN lens, etc. Preferably, a fiber alignment device is used for coupling, and the fiber alignment device aligns the light beam emitted by the VCSEL body and the input end of the first optical fiber. The fiber alignment device includes a three-dimensional mobile platform and an optical microscope. The three-dimensional mobile platform is used to accurately adjust the position of the optical fiber and the VCSEL to achieve optimal coupling, and the optical microscope is used to observe and align the relative position of the first optical fiber and the VCSEL body.

[0035] The fiber optic splitter body is a 2×2 splitter, which can split the input optical signal into two output optical signals, and the splitting ratio can be designed according to the requirements. In the present invention, the splitting ratio of the fiber optic splitter body is 90:10, and a small amount of light is coupled into the second optical fiber. The fiber optic splitter body adopts Thorlabs 2×2 single mode fused fiber optic couplers / taps. These devices have low insertion loss and high stability. The insertion loss of the signal output at a splitting ratio of 90:10 is 0.6dB, which is suitable for the application in the present invention. The other end of the first optical fiber is connected to the fiber optic splitter body. After the laser is split by the fiber optic splitter body, one end is connected to one end of the second optical fiber for feedback control; the other end is used for the main application. The second optical fiber is also a single-mode optical fiber. The other end of the second optical fiber is connected to a light detector.

[0036] The light detector is a photodiode or a photomultiplier tube. When a photodiode is used, a Thorlabs PDA100A2 is used, and the spectral response range is 320 nanometers to 1100 nanometers. The photodiode has high sensitivity and is suitable for applications in a wide spectral range, and is suitable for high-precision light detection in the present invention. When a photomultiplier tube is used, a Hamamatsu R7400U is used, and the spectral response range is 185 nanometers to 900 nanometers. The photomultiplier tube has the characteristics of high sensitivity and low noise, and is suitable for high-precision and low-light level detection in the present invention. The light detector also includes an amplifier, a filter, and a conditioning circuit. The main function of the amplifier is to enhance the electrical signal output by the light detector. While amplifying the useful signal, the amplifier also amplifies the noise. The filter is used to remove noise and interference in the signal. The filter improves the quality of the signal and reduces the error and interference caused by noise by selectively passing the signal of a specific frequency. The conditioning circuit is used to further process the signal to meet the requirements of the subsequent processing unit. For example, the conditioning circuit adjusts the signal to a suitable level for processing by the analog-to-digital converter (ADC) or other digital circuits. The conditioning circuit can also linearize the signal to improve measurement accuracy, correct the DC offset in the signal, and ensure that the reference level of the signal is consistent.

[0037] The feedback control unit connects the photodetector and the VCSEL body. The feedback control unit includes a feedback circuit and a control unit, the feedback circuit includes a comparator, an amplifier, and a filter, and the control unit includes a microcontroller. The feedback control unit adjusts the operating point of the VCSEL body according to the electrical signal of the photodetector. Among them, the function of the comparator is to compare the electrical signal output by the photodetector with a reference signal and produce an error signal. This error signal is used for the feedback control unit to adjust the operating point of the VCSEL body to ensure the stability of the output light intensity. The comparator adopts Texas Instruments LMV7219, which has a response time of 8ns. It is a single comparator with high speed and low power consumption, which is suitable for the feedback control unit in the present invention.

[0038] In this application, the VCSEL body emits laser light and enters the first optical fiber through a coupling lens. The first optical fiber transmits light to the 2×2 optical fiber beam splitter body, and the optical fiber beam splitter body splits the laser into two beams: one beam is transmitted to the optical detector through the second optical fiber, and the other beam is used for the main application. The optical detector (such as a photodiode or a photomultiplier tube) converts the optical signal into an electrical signal, and the signal is amplified by the amplifier, denoised by the filter, and adjusted by the conditioning circuit before being transmitted to the comparator. The comparator compares the signal with the reference signal to generate an error signal, and the feedback control unit adjusts the injection current of the VCSEL according to the error signal to achieve a stable output light intensity. The 2×2 optical fiber beam splitter body used in this application can achieve stable light intensity distribution, and accurately divide the light beam emitted by the VCSEL into two parts, one for the main application and the other for feedback control. This can provide a stable and predictable light intensity, ensure the accuracy of the feedback signal, and help maintain the stability of the VCSEL output. In addition, the 2×2 beam splitter has low insertion loss and high coupling efficiency, can effectively transmit optical signals, reduce light loss, and improve system performance. The bidirectional operation characteristics of the beam splitter increase the flexibility of system design, are suitable for a variety of optical communication application scenarios, and enhance the reliability and stability of the system.

[0039] Preferably, the fiber beam splitter packaging structure is placed in a sealed box. The sealed box is made of aluminum alloy or stainless steel, and the sealed box has good mechanical stress, thermal stability and resistance to environmental influence. Aluminum alloy has good mechanical stress and thermal conductivity, and is helpful for heat dissipation. The length of the sealed box is about 100 mm, the width is about 50 mm, and the height is about 30 mm, ensuring sufficient internal space for easy installation and operation. Preferably, the sealed box includes a box body and a cover, and the box body and the cover are detachable, and the edges are installed and maintained. A sealing strip is provided at the joint of the box body and the cover to ensure sealing and prevent dust and moisture from entering. The sealed box has a built-in metal bracket for fixing the fiber beam splitter body, and the bracket is usually welded or screwed to the inner surface of the box body. Fiber penetration holes are opened at both ends of the box body, and the aperture is slightly larger than the fiber diameter to ensure that the fiber can pass smoothly. The aperture is 3 mm to 5 mm, and the specific size depends on the outer diameter of the optical fiber and the thickness of the protective layer. Holes are provided at both ends of the sealed box to facilitate the penetration of the first optical fiber and the second optical fiber. The first optical fiber and the second optical fiber penetrate the sealed box, and the first optical fiber and the second optical fiber are connected to the fiber beam splitter body in the sealed box. A sealing ring is installed around the hole or a sealing glue is used to ensure that the sealing performance is not affected when the optical fiber passes through. The optical fiber beam splitter packaging structure is fixed by a metal bracket fixed on the inner surface of the sealing box.

[0040] Preferably, a heat sink or heat dissipation channel is designed inside the sealing box, and a heat dissipation structure made of high thermal conductivity materials such as copper or aluminum alloy is used to help quickly dissipate the heat generated by the fiber optic splitter body during operation, maintain stable operation, and thus achieve a stable splitting ratio.

[0041] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A fiber beam splitter packaging structure, characterized in that: It comprises an optical fiber beam splitter body, a buffer layer, a heat-conducting layer and a rigid layer. The optical fiber beam splitter body is a fused-taper optical fiber beam splitter. The buffer layer covers the optical fiber beam splitter body. The heat-conducting layer covers the buffer layer. The rigid layer covers the heat-conducting layer.

2. The optical fiber beam splitter packaging structure according to claim 1, characterized in that: The material of the buffer layer is silicone, the material of the heat-conducting layer is heat-conducting silicone, and the material of the rigid layer is stainless steel.

3. The optical fiber beam splitter packaging structure according to claim 1, characterized in that: In the coupling region of the optical fiber beam splitter body, the buffer layer is thick and the heat-conducting layer is thin; in the core region of the optical fiber beam splitter body, the buffer layer is thin and the heat-conducting layer is thick.

4. A VCSEL, characterized in that: It comprises a VCSEL body and a fiber beam splitter packaging structure as claimed in any one of claims 1 to 3.

5. The VCSEL according to claim 4, characterized in that: It also includes a first optical fiber, a second optical fiber, a light detector, and a feedback control unit. The VCSEL body emits a laser, which is coupled into one end of the first optical fiber. The other end of the first optical fiber is connected to the optical fiber splitter body. After the laser is split by the optical fiber splitter body, it is connected to one end of the second optical fiber. The other end of the second optical fiber is connected to the light detector. The feedback control unit is connected to the light detector and the VCSEL body. The feedback control unit adjusts the working point of the VCSEL body according to the electrical signal of the light detector.

6. The VCSEL according to claim 5, characterized in that: The optical fiber beam splitter body is a 2×2 beam splitter.

7. The VCSEL according to claim 6, characterized in that: The splitting ratio of the optical fiber splitter body is 90:10, and a small amount of light is coupled into the second optical fiber.

8. The VCSEL according to claim 7, characterized in that: The optical fiber beam splitter packaging structure is placed in a sealed box.

9. The VCSEL according to claim 8, characterized in that: The first optical fiber and the second optical fiber pass through the sealing box, and the first optical fiber and the second optical fiber are connected to the optical fiber splitter packaging structure in the sealing box.

10. The VCSEL according to claim 9, characterized in that: The optical fiber beam splitter packaging structure is fixed by a metal bracket fixed on the inner surface of the sealing box.

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