阅读说明：本技术 一种非球面无热化高效光纤耦合器 (Aspheric athermal high-efficiency optical fiber coupler ) 是由 王泰升 张红鑫 史成勇 于 2020-12-24 设计创作，主要内容包括：本发明涉及一种非球面无热化高效光纤耦合器,属于光纤传输及光电技术领域。解决传统光纤耦合器像差难以控制,成像不清,耦合器效率低的技术问题。本发明的光纤耦合器首先引入非球面设计,利用非球面透镜有效控制像差,以此来改进聚焦光斑的质量,达到提高耦合效率的目的；其次引入光机一体无热化设计,将光学材料和机械结构的热性能统一考虑,使得耦合器在高温工作时,焦距、工作距离不变,从而确保耦合效率不下降；同时采用两体独立的无接触设计,镜体之间以平行光配合,对配合精度无要求,使得两体之间的装配距离误差对耦合效率无影响,从而降低装配难度,提高了耦合器的使用可靠性。(The invention relates to an aspheric athermal high-efficiency optical fiber coupler, and belongs to the technical field of optical fiber transmission and photoelectricity. The technical problems that the aberration of a traditional optical fiber coupler is difficult to control, imaging is unclear and the coupler efficiency is low are solved. The optical fiber coupler firstly introduces an aspheric surface design, and utilizes an aspheric lens to effectively control aberration so as to improve the quality of a focused light spot and achieve the aim of improving the coupling efficiency; secondly, a light-machine integrated athermalization design is introduced, and the thermal performance of optical materials and the thermal performance of a mechanical structure are considered uniformly, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is ensured not to be reduced; meanwhile, the two bodies are independent and are in a non-contact design, the lens bodies are matched with each other through parallel light, the matching precision is not required, the coupling efficiency is not affected by the assembling distance error between the two bodies, the assembling difficulty is reduced, and the use reliability of the coupler is improved.)

1. An aspheric athermal high-efficiency fiber coupler is characterized by comprising an aspheric optical system (1), an optical fiber positioning device (2) and a system shell (3);

the aspheric optical system (1) is arranged in the optical fiber positioning device (2), and the optical fiber positioning device (2) is arranged in the system shell (3);

the aspheric optical system (1) effectively controls aberration by using an aspheric lens so as to improve the quality of a focused light spot and further improve the coupling efficiency;

the aspheric optical system (1) and the optical fiber positioning device (2) adopt a light machine integrated athermalization design, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is not reduced.

2. The aspheric athermal high-efficiency fiber coupler according to claim 1, wherein the aspheric optical system (1) comprises two aspheric lenses, wherein one aspheric lens transmits the light of the transmitting fiber to the other aspheric lens in the form of parallel light and then converges the light to the end face of the receiving fiber.

3. The aspheric athermalized high efficiency fiber coupler of claim 1, wherein the aspheric lens is quartz glass, the fiber positioning device (2) is a metal material, and the system housing (3) is a metal material.

4. The aspheric athermal high-efficiency fiber coupler according to claim 1, wherein the two aspheric focal points of the aspheric optical system (1) are respectively provided with an optical fiber limit bayonet (5) for respectively limiting the insertion depth of the transmitting optical fiber and the receiving optical fiber, so as to ensure that the end surface of each optical fiber is positioned at the aspheric focal point.

5. An aspheric athermalized high-efficiency fiber coupler according to claim 1, characterized in that the fiber positioning device (2) is internally provided with fiber plugging/unplugging channels (6) for positioning the transmitting fiber and the receiving fiber at two foci of the aspheric optical system (1), respectively.

6. An aspheric athermalized high-efficiency fiber coupler according to claim 1, characterized in that the fiber positioning device (2) is provided with a fiber external port (7) compatible with standard fiber splices.

7. An aspheric athermalized high-efficiency fiber coupler according to claim 1, characterized in that the system housing (3) is provided with a fiber socket (4).

Technical Field

The invention belongs to the technical field of optical fiber transmission and photoelectricity, and particularly relates to an aspheric athermal high-efficiency optical fiber coupler.

Background

The optical fiber coupler is a device for connecting optical fibers and an optical system, and can be used for butting the light beam and the optical fibers so as to couple light energy to the receiving optical fiber to the maximum extent and improve the light energy transmission efficiency of the whole optical fiber system, thereby having important significance for photoelectric systems such as laser transmission, information transmission and the like.

The conventional optical fiber coupler has the following disadvantages: (1) most of the couplers adopt a spherical system design, and the coupling efficiency can reach 92% theoretically. However, due to the influence of many factors, the phenomena of poor light beam focusing effect, increased aberration and light beam deformation, and unclear imaging can occur, which finally results in the reduction of coupling efficiency. (2) The athermal design is not performed, and the athermal design means that different thermal characteristics of optical materials and mechanical materials are utilized during system design, so that the systems compensate each other when the temperature is increased or decreased, and the optical system is ensured to keep a stable image surface position and stable image quality in a larger temperature range. The lack of athermal designs therefore does not always maintain good operating characteristics over temperature variations, resulting in a decrease in coupler efficiency. (3) The conventional coupler usually adopts a single structure due to the control of process manufacturing and cost, and the structure is very sensitive to the error of system assembly and the operation error of a user, so that the situations of misoperation or efficiency reduction are very easy to occur.

Disclosure of Invention

The invention provides an aspheric athermal high-efficiency optical fiber coupler, which aims to solve the technical problems of difficult aberration control, unclear imaging and low coupler efficiency of the traditional optical fiber coupler. The optical fiber coupler firstly introduces an aspheric surface design, and utilizes an aspheric lens to effectively control aberration so as to improve the quality of a focused light spot and achieve the aim of improving the coupling efficiency; secondly, a light-machine integrated athermalization design is introduced, and the thermal performance of optical materials and the thermal performance of a mechanical structure are considered uniformly, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is ensured not to be reduced; meanwhile, the two bodies are independent and are in a non-contact design, the lens bodies are matched with each other through parallel light, the matching precision is not required, the coupling efficiency is not affected by the assembling distance error between the two bodies, the assembling difficulty is reduced, and the use reliability of the coupler is improved.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the invention provides an aspheric athermal high-efficiency optical fiber coupler, which comprises an aspheric optical system, an optical fiber positioning device and a system shell, wherein the aspheric optical system is provided with a plurality of optical fiber positioning devices;

the aspheric optical system is arranged in the optical fiber positioning device which is arranged in the system shell;

the aspheric optical system effectively controls aberration by using an aspheric lens so as to improve the quality of a focused light spot and further improve the coupling efficiency;

the aspheric optical system and the optical fiber positioning device adopt a light machine integrated athermalization design, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is not reduced.

In the above technical solution, the aspheric optical system is composed of two aspheric lenses, wherein one aspheric lens transmits light of the transmitting optical fiber to the other aspheric lens in a form of parallel light, and then converges the light to the end face of the receiving optical fiber. The two aspheric lenses and the optical fiber and the aspheric mirror are not in contact with each other and are matched with each other by parallel light without precise adjustment.

In the above technical solution, the aspheric lens is made of quartz glass with a very small expansion coefficient, the optical fiber positioning device is made of a metal material, and the system housing is made of a metal material.

In the above technical solution, two aspheric focus points of the aspheric optical system are respectively provided with an optical fiber limit bayonet to respectively limit the insertion depth of the transmitting optical fiber and the receiving optical fiber, thereby ensuring that the end surface of each optical fiber is positioned at the aspheric focus point.

In the above technical solution, an optical fiber plugging channel is arranged inside the optical fiber positioning device, and the transmitting optical fiber and the receiving optical fiber are respectively positioned at two focuses of the aspheric optical system.

In the above technical solution, the optical fiber positioning device is provided with an optical fiber external port compatible with a standard optical fiber connector.

In the above technical solution, the system housing is provided with an optical fiber socket.

The invention has the beneficial effects that:

the aspheric surface athermal high-efficiency optical fiber coupler adopts aspheric surface design to control aberration, so that the quality of focused light spots is improved, and the aim of improving coupling efficiency is fulfilled; the optical-mechanical integrated athermalization design is introduced, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is ensured not to be reduced; meanwhile, the two bodies are independent and are in a non-contact design, the lens bodies are matched with each other through parallel light, the matching precision is not required, the coupling efficiency is not affected by the assembling distance error between the two bodies, the assembling difficulty is reduced, and the use reliability of the coupler is improved. The invention can improve the coupling efficiency of the optical fiber coupler and has important significance for photoelectric systems such as laser conduction, information transmission and the like.

Drawings

FIG. 1 is a diagram of the internal structure of an aspheric athermal high-efficiency fiber coupler;

FIG. 2 is an external structural view of an aspheric athermal high efficiency fiber coupler;

FIG. 3 is a cross-sectional view of an optical fiber positioning device.

Wherein: the optical fiber positioning system comprises a 1-aspheric optical system, a 2-optical fiber positioning device, a 3-system shell, a 4-optical fiber socket, a 5-optical fiber limiting bayonet, a 6-optical fiber plugging channel and a 7-optical fiber external port.

Detailed Description

The invention idea of the invention is as follows: the invention provides an aspheric athermal high-efficiency fiber coupler, which aims to solve the problems of difficulty in controlling aberration, unclear imaging and low coupler efficiency of the traditional fiber coupler. The optical fiber coupler firstly introduces an aspheric surface design, and utilizes an aspheric lens to effectively control aberration so as to improve the quality of a focused light spot and achieve the purpose of improving the coupling efficiency; secondly, a light-machine integrated athermalization design is introduced, and the thermal performance of optical materials and the thermal performance of a mechanical structure are considered uniformly, so that the focal length and the working distance of the coupler are unchanged when the coupler works at high temperature, and the coupling efficiency is ensured not to be reduced; meanwhile, the two bodies are independent and are in a non-contact design, the lens bodies are matched with each other through parallel light, the matching precision is not required, the coupling efficiency is not affected by the assembling distance error between the two bodies, the assembling difficulty is reduced, and the use reliability of the coupler is improved.

The invention relates to an aspheric athermal high-efficiency optical fiber coupler, which mainly comprises three parts: aspheric optical system 1, optical fiber positioning device 2 and system shell 3.

In the aspheric athermal high-efficiency fiber coupler of the present invention, the aspheric optical system 1 is formed by two aspheric lenses, wherein one aspheric lens transmits light of the transmitting fiber to the other aspheric lens in a form of parallel light, and then converges the light to the end face of the receiving fiber. The two aspheric lenses and the optical fiber and the aspheric lens are not in contact with each other and are matched with each other by parallel light without precise adjustment.

In the aspheric athermal high-efficiency optical fiber coupler, the optical fiber positioning device 2 is designed by adopting a plug-in structure, the whole body is of a metal structure, an optical fiber plug-in channel 6 is designed in the structure, an optical fiber limiting bayonet 5 is designed at the focus of an aspheric lens, the insertion depth of an optical fiber is limited, and the end face of the optical fiber is ensured to be positioned at the focus of the aspheric lens. Meanwhile, the optical fiber positioning device 2 is provided with an optical fiber external port 7, and the optical fiber external port 7 is compatible with a standard optical fiber connector without special treatment on the optical fiber port.

The optical fiber positioning device 2 and the aspheric optical system 1 adopt an optical machine integrated athermalization design, optical materials and the thermal performance of a mechanical structure are considered uniformly, quartz glass with a very small expansion coefficient is used as an aspheric lens material, and meanwhile, the system shell 3 adopts an all-metal structure, so that a good heat dissipation effect is ensured, the focal length and the working distance of the coupler are unchanged when the coupler works at a high temperature, and the coupling efficiency is not reduced and the stable transmission of optical fiber energy is ensured.

In the aspheric athermal high-efficiency fiber coupler of the present invention, the system housing 3 is an external structure that defines the whole system in a closed space, and is generally made of metal material. In order to ensure a good heat dissipation effect of the system, the system shell 3 is in close contact with the optical fiber positioning device 2 in a physical attachment mode, so that heat is rapidly conducted, and meanwhile, external screw holes are reserved on the outer portion of the system shell, so that the system shell is conveniently connected with other external equipment. Except for the optical fiber socket 4, the other parts of the system shell 3 are completely closed, so that external light is prevented from entering the system and affecting the coupling efficiency.

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

The aspheric athermal high-efficiency optical fiber coupler of the present invention is composed of an aspheric optical system 1, an optical fiber positioning device 2 and a system housing 3, wherein the internal structure of the coupler is shown in fig. 1, the external structure (system housing 3) is shown in fig. 2, and the optical fiber positioning device 2 is shown in fig. 3.

The aspheric optical system 1 is composed of two aspheric lenses, and controls optical aberration by introducing the two aspheric lenses, wherein one aspheric lens transmits light of the transmitting optical fiber to the other aspheric lens in a form of parallel light and then converges the light to the end face of the receiving optical fiber, as shown in fig. 1. The two aspheric lenses and the optical fiber and the aspheric mirror are not in contact with each other and are matched with each other by parallel light without precise adjustment.

The optical fiber positioning device 2 is designed in a plug-in structure, as shown in fig. 3. The whole body is of a metal structure, an optical fiber plugging channel 6 is designed in the structure, an optical fiber limiting bayonet 5 is designed at the focus of the aspheric lens, the insertion depth of the optical fiber is limited, and the end face of the optical fiber is positioned at the focus of the aspheric lens. Meanwhile, the optical fiber positioning device 2 is provided with an optical fiber external port 7, and the optical fiber external port 7 is compatible with a standard optical fiber connector without special treatment on the optical fiber port.

The optical fiber positioning device 2 and the aspheric optical system 1 adopt an optical machine integrated athermalization design, optical materials and the thermal performance of a mechanical structure are considered uniformly, quartz glass with a very small expansion coefficient is used as an aspheric lens material, and meanwhile, the shell adopts an all-metal structure, so that a good heat dissipation effect is ensured, the focal length and the working distance of the coupler are unchanged when the coupler works at a high temperature, and the coupling efficiency is not reduced and the stable transmission of optical fiber energy is ensured.

The system housing 3 is an external structure for defining the whole system in a closed space, as shown in fig. 2, and is generally made of a metal material. In order to ensure a good heat dissipation effect of the system, the system shell 3 is in close contact with the optical fiber positioning device 2 in a physical attachment mode, so that heat is rapidly conducted, and meanwhile, external screw holes are reserved on the outer portion of the system shell, so that the system shell is conveniently connected with other external equipment. Except for the optical fiber socket 4, the other parts of the system shell 3 are completely closed, so that external light is prevented from entering the system and affecting the coupling efficiency.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.