CN111273411A - A high air tightness optical fiber and photoelectric detector packaging device and method - Google Patents

Abstract

The invention discloses a high-air tightness optical fiber and photoelectric detector packaging device, comprising a fiber through hole with a protective layer, one end of the optical fiber through hole with a protective layer is a glue-filling curing point A, and an optical fiber The other end of the hole is connected to one end of the ultra-precision positioning platform. The ultra-precision positioning platform is provided with a glue curing point B. The other end of the ultra-precision positioning platform is connected to a signal output pin, and the outlet of the signal output pin is glued and cured. Point C; the present invention also discloses a high air tightness packaging method for the optical fiber and the photoelectric detector. The cost of the present invention is relatively low, the process is relatively simple, but the air-tight performance and coupling efficiency are higher. In addition, the combination of active alignment, fine-tuning ultra-precision positioning platform, thread positioning fine-tuning structure and self-focusing lens auxiliary optical structure ensures that The entire packaging scheme is implemented without errors. It solves the problems of fiber displacement, low coupling efficiency and low air tightness existing in the packaging of the optical fiber and the detector, and improves the work efficiency and process consistency.

Description

A high air tightness optical fiber and photoelectric detector packaging device and method

technical field

The invention belongs to the technical field of electronic information, and in particular relates to a device and a method for improving the airtight performance and coupling efficiency of an optical fiber and a photoelectric module when applied in an aerospace environment.

Background technique

Due to the rapid development of manned spaceflight and space information acquisition technology, a large amount of data needs to be exchanged in real time between spacecraft and the ground and spacecraft. Radio frequency communication is limited by bandwidth and cannot meet the communication needs of aerospace systems. (Ren Jianying, Sun Huayan, Zhang Laixian, Zhang Tianqi. Development status of space laser communication and new networking methods [J]. Laser and Infrared, 2019, 49(02): 143-150.) Free Space Optics (FSO) ) communication uses light as the carrier and directly transmits high-speed data in space. It has large communication capacity, high speed, small size and low power consumption. It is an important means of next-generation inter-satellite, satellite-to-ground communication and networking. At present, the development of optical fiber communication equipment is relatively complete. Some scholars propose to convert the space transmission beam into optical fiber transmission through space optical-fiber coupling technology (Lei Sichen. Research on Optical Coupling and Beam Control Technology in Free Space Optical Communication [D]. Xi'an Institute of Technology University, 2016.), can realize a space optical communication platform based on FSO free space optical communication outside the cabin and optical fiber communication in the cabin, and reduce the development cost of the "air-ground integration" optical communication network platform. Therefore, the packaging technology of optical fiber and photodetector is the key link of photoelectric conversion of optical communication/optical network.

At present, the optical fiber and the detector are often packaged by using the optical fiber sleeve-shielding cap-tube base and other structures after optical alignment, and then bonding and packaging with epoxy glue. The existing packaging technology has problems such as fiber displacement, low air tightness, and long glue sealing curing time. First, fiber displacement occurs due to the inherent cure shrinkage of the adhesive. When the device is in use, the fiber displacement caused by poor temperature resistance and other physical properties is more serious. In the aerospace environment (-40℃-100℃ on-orbit operating temperature difference, ultraviolet aging, etc.) this phenomenon will be more serious. obvious. After the optical fiber is displaced, the optical power of the outgoing fiber is reduced, and the coupling efficiency of the optoelectronic module is reduced, which makes the device unusable. Secondly, the air tightness of the adhesive seal is not easy to guarantee. As a result, during the use of the device, the harmful atmosphere is easy to enter the tube shell and corrode the die, which has a great impact on the long-term stability and reliability of the device. Finally, in the packaging and manufacturing of the device, in order to increase the uniform density of the sealant after curing, the amount of catalyst used and the curing temperature of the sealant will be reduced, which greatly increases the curing time and makes it difficult to achieve mass production. These three major problems seriously hinder the development of the integration of optical fibers and optoelectronic devices. In addition, the optoelectronic modules used in the aerospace environment put forward higher requirements for the anti-vibration, high and low temperature, airtightness and selection of packaging materials of the packaging, which requires in-depth research on packaging technology.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high air tightness optical fiber and photoelectric detector packaging device, solve the technical problems of poor air sealing performance and low coupling efficiency between optical fiber and photoelectric detection module during the packaging process of optical fiber and detector, and improve the performance of photoelectric module. Transfer efficiency, transfer rate, process uniformity and assembly efficiency.

Another object of the present invention is to provide a highly airtight optical fiber and photodetector packaging method.

The technical scheme adopted by the present invention is that a high-air tightness optical fiber and photoelectric detector packaging device comprises an optical fiber through hole with a protective layer, and one end of the optical fiber through hole with a protective layer is a glue-filled curing point A, and a The other end of the optical fiber through hole of the protective layer is connected with one end of the ultra-precision positioning platform. The ultra-precision positioning platform is provided with a glue curing point B. The photodetector and the signal output pin are connected through the ultra-precision positioning platform. The signal output tube The outlet of the foot is the glue curing point C.

The present invention is also characterized in that,

A protective layer casing is arranged outside the optical fiber through hole with a protective layer, and the protective layer casing is fixedly connected with the ultra-precision positioning platform.

The ultra-precision positioning platform adopts a six-axis thread positioning and fine-tuning structure, which is divided into a left part and a right part, and a glue curing point B is set in the middle of the left and right parts.

The left part is in the shape of a cylinder, and its outer surface is the casing of the encapsulation device. The diameter of the casing of the encapsulation device is larger than that of the protective layer casing. Six threaded holes are evenly arranged on the cross-section of the casing of the encapsulation device. The optical fiber through hole of the coating layer is provided with a boss at the end of the left part;

The right part is in the shape of a hollow cylinder, and its inner diameter matches the boss of the left part. The cross section of the right part is also provided with threaded holes corresponding to the left part. There is a signal shielding layer, and the inner side of the signal shielding layer has only a photodetector, and the photosensitive surface of the photodetection faces the left part.

An auxiliary optical structure is arranged on the boss, and the auxiliary optical structure is a microlens or a self-focusing lens, which can process the section of the optical fiber.

A sealing groove is provided at the interface between the left part and the right part.

A high-airtight optical fiber and photoelectric detector packaging method adopts a high-air-tight optical fiber and photoelectric detector packaging device, and is implemented according to the following steps:

Step 1: Remove part of the coating layer from the tail end of the optical fiber, leaving part of the protective layer, and insert the optical fiber through hole with the coating layer through the optical fiber through hole with the protective layer;

Step 2: Glue the auxiliary optical structure of the self-focusing lens on the end face of the pigtail to ensure that the light-emitting end face of the optical fiber and the effective area of the photosensitive surface of the detector form the best theoretical structure of optical field coupling, and glue and fix it at the glue curing point A;

Step 3: During the packaging process, adjust the alignment posture of the photosensitive surface of the detector and the fiber end face by controlling the fine-tuning ultra-precision positioning platform, and fine-tune the six-axis thread positioning and fine-tuning structure for fine alignment. When the signal output of the photoelectric detector is the largest, The glue is dispensed and cured from the dispensing curing point B, and the relative position of the optical fiber and the detector is fixed;

Step 4: Perform signal shielding processing through the signal shielding layer on the connecting part of the detector pins, and solidify the pins at the glue pouring and curing point C to ensure the stability of the overall structure and air tightness requirements.

The six-axis thread positioning and fine-tuning structure is packaged with a small amount of all-metal sealant.

The beneficial effects of the present invention are:

The invention utilizes the design of the auxiliary optical structure to improve the coupling efficiency of the optical fiber and the photoelectric detector; and proposes an all-metal packaging combined with a small amount of glue packaging to improve the air tightness of the optical fiber and the photoelectric detector, and ensure the optical fiber and the photoelectric detector. The package structure can maintain high air tightness and stability of coupling efficiency in the aerospace environment, solve the problems of fiber displacement, low coupling efficiency and low air tightness existing in the optical fiber and detector packaging, and improve work efficiency and process consistency.

Description of drawings

FIG. 1 is a structural side view of an optical fiber and a photoelectric module packaging device of a highly airtight optical fiber and photoelectric detector packaging device of the present invention.

FIG. 2 is a top view of an optical fiber and a photoelectric module packaging device of a highly airtight optical fiber and a photoelectric detector packaging device of the present invention.

FIG. 3 is a schematic diagram of an active coupling alignment scheme of an optical fiber and a photoelectric module of a method for packaging an optical fiber and a photoelectric detector with high airtightness according to the present invention.

In the figure, 1. Glue curing point A, 2. Optical fiber through hole with protective layer, 3. Ultra-precision positioning platform, 4. Glue curing point B, 5. Photosensitive surface of detector, 6. Glue curing point C, 7. Signal output pin, 8. Fiber through hole with coating, 9. Sealing groove, 10. Auxiliary optical structure, 11. Signal shielding layer, 12. Threaded hole, 13. Protective layer shell, 14 . Encapsulation device shell, 15. Light source, 16. Optical fiber, 17. Signal detector.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

A highly airtight optical fiber and photoelectric detector packaging device, as shown in Figure 1, includes an optical fiber through hole 2 with a protective layer, and one end of the optical fiber through hole 2 with a protective layer is a glue-filled curing point A1, with a protective layer. The other end of the optical fiber through hole 2 of the layer is connected with one end of the ultra-precision positioning platform 3. The ultra-precision positioning platform 3 is provided with a glue curing point B4, and the photodetector and the signal output pin 7 are connected to the ultra-precision positioning platform 3. Connection, the outlet of the signal output pin 7 is the glue pouring and curing point C6. The other end of the ultra-precision positioning platform 3 is connected with a signal output pin 7 , and the outlet of the signal output pin 7 is the glue pouring and curing point C 6 .

A protective layer casing 13 is provided outside the optical fiber through hole 2 with a protective layer, and the protective layer casing 13 is fixedly connected to the ultra-precision positioning platform 3 .

The super-precision positioning platform 3 adopts a six-axis thread positioning and fine-tuning structure, which is divided into a left part and a right part, and a glue curing point B4 is set in the middle of the left and right parts.

The left part is in the shape of a cylinder, and its outer surface is an encapsulation device casing 14, and the diameter of the encapsulation device casing 14 is larger than that of the protective layer casing 13. As shown in FIG. The center of the six-axis thread positioning and fine-tuning structure is provided with an optical fiber through hole 8 with a coating layer, and the end of the left part is provided with a boss;

The right part is in the shape of a hollow cylinder, and its inner diameter matches the boss of the left part. The cross section of the right part is also provided with a threaded hole 12 corresponding to the left part, and the right part is connected with the signal output pin 7. A signal shielding layer 11 is provided on the side, the inner side of the signal shielding layer 11 has only the photodetector 5, and the photosensitive surface of the photodetector 5 faces the left part.

An auxiliary optical structure 10 is arranged on the boss, and the auxiliary optical structure 10 is a microlens or a self-focusing lens, and can be used for fiber section processing.

A sealing groove 9 is provided at the interface between the left part and the right part.

A high air tightness optical fiber and photoelectric detector packaging method, adopting a high air tightness optical fiber and photoelectric detector packaging device, is characterized in that, is implemented according to the following steps:

Step 1: Remove part of the coating layer from the end of the optical fiber, leaving part of the protective layer, and insert the optical fiber through hole 8 with the coating layer through the optical fiber through hole 2 with the protective layer;

Step 2: Glue the self-focusing lens auxiliary optical structure 10 on the end face of the pigtail to ensure that the light-emitting end face of the optical fiber and the effective area of the photosensitive surface of the detector form an optimal optical field coupling theoretical structure, and glue and fix it at the glue pouring and curing point A1;

Step 3: During the packaging process, adjust the alignment posture between the photosensitive surface of the detector and the end face of the optical fiber by controlling the fine-tuning ultra-precision positioning platform, and finely adjust the six-axis through the precise feedback between the signal detector 17 and the ultra-precision positioning platform 3 The thread positioning and fine-tuning structure is used for fine alignment. When the signal output of the photoelectric detector is the largest, the glue is dispensed and cured from the dispensing and curing point B 4, and the relative position of the optical fiber and the detector is fixed;

Step 4: Perform signal shielding processing through the signal shielding layer 11 on the connecting part of the detector pins, and solidify the pins at the glue pouring and curing point C6 to ensure the stability of the overall structure and air tightness requirements.

The six-axis thread positioning and fine-tuning structure is packaged with a small amount of all-metal sealant.

The packaging technology scheme adopted in the present invention is to turn on the light source 15 and use the design of the auxiliary optical structure to improve the coupling efficiency of the optical fiber and the photodetector; combine the finite element analysis to optimize the overall packaging design, and propose an all-metal packaging combined with a small amount of glue The packaging method of the optical fiber and the photoelectric detector improves the air tightness of the optical fiber and the photoelectric detector, and ensures that the packaging structure of the optical fiber and the photoelectric detector can maintain high air tightness and stability of the coupling efficiency in the aerospace environment. First, strip off the fiber 16 pigtail, leave part of the protective layer, and insert the fiber through hole with the coating. The length of the through hole and the glue filling process directly affect the airtightness of the optoelectronic device package. On the one hand, the preservation of the fiber coating layer is a In order to squeeze the fiber due to thermal expansion and cold contraction, on the other hand, it will also have a good buffering and vibration isolation effect; secondly, the auxiliary optical structure of the self-focusing lens is glued on the end face of the pigtail to ensure that the input optical field and the detection field have the best results. The field coupling structure is glued and fixed; as shown in Figure 3, finally, the alignment posture of the fiber end face and the detector photosensitive surface is adjusted by controlling the fine-tuning ultra-precision positioning platform, and the thread positioning and fine-tuning structure is finely adjusted for fine alignment, and the concave seal is sealed. The groove is reserved to effectively prevent the glue from entering the seal inside the device, and to fix the relative position of the optical fiber and the detector. When the signal output of the photoelectric detector is the largest, the glue is dispensed and cured. The signal shielding treatment of the part connected to the detector pins is also added, and the pins are cured to ensure the stability and air tightness of the overall structure.

Example

In satellite-to-ground, inter-satellite, air-to-ground and ground-to-ground optical communication networks, packaging devices with high airtight performance and high coupling efficiency are key components in communication systems. Due to the vibration of the spacecraft and the special environmental conditions of on-orbit operation (including the temperature difference of -40℃-100℃ on-orbit operation, ultraviolet aging, etc.) problems such as decreased light efficiency. Through the device of the present invention, the combined use of the ultra-precision positioning platform and the six-axis thread positioning and fine-tuning structure, through active alignment (as shown in Figure 3), ensures the complete alignment of the optical fiber and the detector, and assists the design of the optical structure The optical field matching is effectively ensured. The optical fiber through hole with protective layer ensures that the optical fiber will not be displaced. A small amount of glue and all-metal packaging can be adapted to various special environments, ensuring the photoelectric conversion efficiency and the reliability of the detection system. sex.

The cost of the present invention is relatively low, the process is relatively simple, but the air sealing performance and coupling efficiency are higher. In addition, the combined use of active alignment, fine-tuning ultra-precision positioning platform, thread positioning fine-tuning structure and self-focusing lens auxiliary optical structure ensures The entire packaging scheme is implemented without errors. It solves the problems of fiber displacement, low coupling efficiency and low air tightness existing in the packaging of the optical fiber and the detector, and improves the work efficiency and process consistency.

Claims (9)

1. A high-air tightness optical fiber and a photodetector packaging device, characterized in that it comprises an optical fiber through hole (2) with a protective layer, and one end of the optical fiber through hole (2) with a protective layer is a glue-filling curing point A (1), the other end of the optical fiber through hole (2) with the protective layer is connected to one end of the ultra-precision positioning platform (3), and the ultra-precision positioning platform (3) is provided with a glue curing point B (4), the ultra-precision positioning platform (3) The other end of the precise positioning platform (3) is connected with a signal output pin (7), and the outlet of the signal output pin (7) is a glue pouring and curing point C (6). 2 . The high-air-tight optical fiber and photodetector packaging device according to claim 1 , wherein a protective layer casing ( 13 ) is provided outside the optical fiber through hole ( 2 ) with a protective layer. 3 . , the protective layer shell (13) is fixedly connected with the ultra-precision positioning platform (3). 3. a kind of high air tightness optical fiber and photoelectric detector packaging device according to claim 2, is characterized in that, what described ultra-precision positioning platform (3) adopts is six-axis thread positioning fine-tuning structure, which is divided into left Part, right part, left part and right part are provided with a glue curing point B (4) in the middle. 4. The high-air-tight optical fiber and photodetector packaging device according to claim 3, wherein the left part is in the shape of a cylinder, and its outer surface is a packaging device shell (14), and the packaging device is in the shape of a cylinder. The diameter of the casing (14) is larger than that of the protective layer casing (13), six threaded holes (12) are uniformly arranged on the cross section of the casing (14) of the packaging device, and the center of the six-axis thread positioning and fine-tuning structure is provided with an optical fiber with a coating layer Through hole (8), the end of the left part is provided with a boss. 5. The high-air tightness optical fiber and photodetector packaging device according to claim 3, wherein the right part is in the shape of a hollow cylinder, and its inner diameter matches the boss of the left part, The cross section of the right part is also provided with a threaded hole (12) corresponding to the left part, and a signal shielding layer (11) is provided on the side of the right part connected to the signal output pin (7), and the signal shielding layer (11) The inner side of this has only the photodetector (5), and the photosensitive surface of the photodetector (5) faces the left part. 6 . The high-air tightness optical fiber and photodetector packaging device according to claim 4 , wherein an auxiliary optical structure ( 10 ) is provided on the boss, and the auxiliary optical structure ( 10 ) is a micro-optical structure. 7 . Lenses or self-focusing lenses, which can be used for fiber section processing. 7 . The high-airtight optical fiber and photodetector packaging device according to claim 6 , wherein a sealing groove ( 9 ) is provided at the interface between the left part and the right part. 8 . 8. A high-air-tight optical fiber and photodetector packaging method, using a high-air-tight optical fiber and photodetector packaging device as described in any one of claims 1-7, characterized in that, Follow these steps to implement: Step 1: Remove part of the coating layer from the end of the optical fiber, leave a part of the protective layer, and insert the optical fiber through hole (8) with the coating layer through the optical fiber through hole (2) with the protective layer; Step 2: Glue the auxiliary optical structure (10) of the self-focusing lens on the end face of the pigtail to ensure that the light-emitting end face of the optical fiber and the effective area of the photosensitive surface of the detector form an optimal optical field coupling theoretical structure. glue fixing; Step 3: During the packaging process, adjust the alignment posture of the photosensitive surface of the detector and the fiber end face by controlling the fine-tuning ultra-precision positioning platform, and fine-tune the six-axis thread positioning and fine-tuning structure for fine alignment. When the signal output of the photoelectric detector is the largest, Dispensing and curing from the dispensing curing point B (4) to fix the relative position of the optical fiber and the detector; Step 4: Perform signal shielding processing through the signal shielding layer (11) on the connecting part of the detector pins, and solidify the pins at the glue pouring and curing point C (6) to ensure the stability of the overall structure and air tightness requirements. 9 . The method for encapsulating an optical fiber and a photodetector with high airtightness according to claim 8 , wherein the six-axis thread positioning and fine-tuning structure is encapsulated by a small amount of all-metal sealant. 10 .

Images