Single-fiber bidirectional optical device
By using the Dovi prism to adjust the beam height difference in optical devices, the beam offset and height difference problems are solved, efficient beam coupling and large-scale production are achieved, and the transmission efficiency and quality of optical signals are improved.
Patent Information
- Application Number
- CN202422169239.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In existing optical device designs, it is difficult to achieve efficient coupling and mass production of coaxial multi-beams, and the beam offset and height difference problems are difficult to effectively solve.
The Daowei prism is used to adjust the height difference between the parallel beams of the origin and ends to achieve spatial overlap of the beams, thereby improving coupling efficiency.
In the presence of material and production process tolerances, efficient coupling of single-fiber bidirectional optical devices is achieved, simplifying design and maintenance, suitable for large-scale production, and improving the transmission efficiency and quality of optical signals.
Smart Images
Figure CN222965446U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical communication, and more particularly to a single-fiber bidirectional optical device. Background Art
[0002] With the rapid development of optical device packaging technology and the demand for faster, more stable and simpler optical network transmission, there is a requirement for coaxial single-fiber bidirectional transmission after multi-beam coupling in optical device design. Under the existing material processing and process conditions, the biggest challenge lies in how to maximize the coupling efficiency of coaxial multi-beams and achieve the feasibility of product batch production.
[0003] In the design of existing BOSA devices, heat dissipation and structural design need to be considered. The optical devices at the transmitting and receiving ends need to be on different material structures, such as different thermoelectric coolers and ceramic substrates. Due to certain tolerances in materials and processes, it is difficult to achieve the coincidence of the beams at the transmitting and receiving ends in coaxial fiber transmission, which will further lead to the fact that the coupling efficiency of the optical components at the transmitting and receiving ends cannot reach the best at the same time.
[0004] To solve the problem of non-coincidence of the beams at the transmitting and receiving ends, the existing technical solutions usually reduce the manufacturing tolerance through precise manufacturing processes and high-precision assembly equipment, so as to improve the alignment accuracy of the beams at the transmitting and receiving ends; in addition, there are also some technical solutions that adjust the direction of the beams by designing special optical elements, such as mirrors, lenses, etc., so that the beams at the transmitting and receiving ends can coincide; there are even those that measure the thickness of different materials through actual measurement and make the optical devices at the transmitting and receiving ends as consistent as possible through screening.
[0005] Although the existing technical solutions solve the problem of beam offset at the transmitting and receiving ends to a certain extent, there are still some problems and disadvantages. First of all, precise manufacturing processes and high-precision assembly equipment are costly and not conducive to large-scale production; secondly, the existing optical element designs are often relatively complex and not easy to implement and maintain.
[0006] Therefore, how to design a technical solution that is simple, easy to implement, low-cost and can effectively solve the problems of beam offset and height difference at the transmitting and receiving ends is an urgent problem to be solved in the current design of optical module products. Summary of the Utility Model
[0007] The purpose of the utility model is to provide a single-fiber bidirectional optical device, which adjusts the height difference between the parallel beams at the transmitting end and the parallel beams at the receiving end through a Dove prism, realizes the coincidence of the two parallel beams in space, and can realize the coincidence of the parallel beams at the receiving end and the transmitting end of the single-fiber bidirectional optical device in the presence of material and production process tolerances, thereby realizing the maximization of the coupling efficiency at the transmitting and receiving ends and solving the problems of beam offset and height difference at the transmitting and receiving ends.
[0008] Embodiments of the present utility model are achieved through the following technical solutions: A single-fiber bidirectional optical device includes a receiving optical component, a transmitting optical component, an external lens, and a ferrule. The transmitting optical component includes a laser, a collimating lens, a Dove prism, and a filter. The receiving optical component includes a focusing lens and a detector;
[0009] The collimating lens is disposed on the outgoing light path of the laser. The emitted light of the laser is collimated into a first parallel light by the collimating lens and emitted to the Dove prism. After internal reflection by the Dove prism, a second parallel light is obtained through the refraction of the filter. The second parallel light is coupled into the ferrule through the external lens;
[0010] The focusing lens is disposed on the incoming light path of the detector. The third parallel light obtained by an external light source passing through the ferrule and the external lens is deflected to the focusing lens through the filter and converges into the detector through the focusing lens. The second parallel light coincides with the third parallel light.
[0011] According to a preferred embodiment, the Dove prism is made of silicon.
[0012] According to a preferred embodiment, both the incident surface and the outgoing surface of the Dove prism are coated with an antireflection film.
[0013] According to a preferred embodiment, both the incident surface and the outgoing surface of the collimating lens are coated with an antireflection film.
[0014] According to a preferred embodiment, both the incident surface and the outgoing surface of the focusing lens are coated with an antireflection film.
[0015] According to a preferred embodiment, the incident surface of the filter corresponding to the laser is coated with an antireflection film, and the outgoing surface is coated with a wavelength division thin film.
[0016] According to a preferred embodiment, the included angle between the filter and the Dove prism is 45°.
[0017] According to a preferred embodiment, the included angle between the focusing lens and the filter is 45°.
[0018] The technical solution of a single-fiber bidirectional optical device provided by an embodiment of the present utility model has at least the following advantages and beneficial effects: (1) By adjusting the height difference between the parallel beam at the transmitting end and the parallel beam at the receiving end through a Dove prism, the coincidence of the two parallel beams in space is realized. In the presence of material and production process tolerances, the coincidence of the parallel beams at the receiving end and the transmitting end of the single-fiber bidirectional optical device can be achieved, thereby maximizing the coupling efficiency between the receiving and transmitting ends. Moreover, the design is simple, easy to implement and maintain; (2) The Dove prism made of silicon material has the advantages of low price, easy processing, high refractive index and smaller size, is more economical and practical, and is suitable for large-scale production; (3) The compatibility of the coupling between the receiving and transmitting ends is improved, and there is a higher coupling efficiency, which can more effectively ensure the transmission efficiency and quality of optical signals. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 FIG. 1 is a schematic structural diagram of a single-fiber bidirectional optical device provided by Embodiment 1 of the present utility model;
[0020] Reference numerals: 1 - flexible circuit board, 2 - metal housing, 3 - laser, 4 - collimating lens, 5 - Dove prism, 6 - filter, 7 - focusing lens, 8 - detector, 9 - outer lens. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the drawings here can be arranged and designed in various different configurations.
[0022] Embodiment 1
[0023] Figure 1 FIG. 1 is a schematic structural diagram of a single-fiber bidirectional optical device of the present utility model. Refer to Figure 1 As shown, the single-fiber bidirectional optical device includes a receiving-end optical component, a transmitting-end optical component, an outer lens 9 and a ferrule. The transmitting-end optical component includes a laser 3, a collimating lens 4, a Dove prism 5 and a filter 6. The receiving-end optical component includes a focusing lens 7 and a detector 8; the laser 3, the collimating lens 4, the filter 6, the focusing lens 7 and the detector 8 are completed by a chip mounting process.
[0024] Specifically, the collimating lens 4 and the filter 6 are both arranged on the outgoing light path of the laser 3, and the focusing lens 7 is arranged on the incoming light path of the detector 8.
[0025] In a possible implementation of this embodiment, when coupling the transmitting optical component, a collimating optical fiber is used to replace the external lens 9 and the ferrule for receiving the parallel light at the transmitting end. Through coupling, the collimating lens 4 in front of the laser 3 is coupled to the optimal state. When coupling the receiving optical component, a collimating optical fiber is used to replace the external lens 9 and the ferrule. After the external light source passes through the collimating optical fiber and the filter 6, parallel light at the receiving end is obtained. Through coupling, the focusing lens 7 in front of the detector 8 is coupled to the optimal state. Then, according to the optimal coupling efficiency of the optical path at the receiving end, the external lens 9 and the ferrule are coupled. At this time, the coupling efficiency of the receiving optical component is optimal, but the coupling efficiency of the transmitting optical component is worse.
[0026] Furthermore, the transmitting optical component provided in this embodiment further includes a Dove prism 5.
[0027] Specifically, the Dove prism 5 is arranged on the outgoing optical path of the laser 3 and is located between the collimating lens 4 and the filter 6. The included angle between the Dove prism 5 and the filter 6 is 45°. The laser 3 emits the emitted light to the incident surface of the collimating lens 4. After the emitted light is collimated into the first parallel light by the collimating lens 4, it is emitted to the incident surface of the Dove prism 5. After being internally reflected by the Dove prism 5, the height changes. This height change is designed according to a preset tolerance to achieve the spatial coincidence of the parallel light beams at the transmitting end and the receiving end. The first parallel light after the height change is refracted by the filter 6 to obtain the second parallel light, and the second parallel light is then coupled into the ferrule through the external lens 9.
[0028] Furthermore, the included angle between the focusing lens 7 and the filter 6 is also 45°. The filter 6 is also used to receive the third parallel light obtained by the external light source passing through the ferrule and the external lens 9 in sequence. The third parallel light is deflected by 90° after passing through the filter 6 and then enters the focusing lens 7, and is converged by the focusing lens 7 to the detector chip of the detector 8.
[0029] In this embodiment, the height difference between the parallel light beam at the transmitting end and the parallel light beam at the receiving end is adjusted by the Dove prism 5 to achieve the spatial coincidence of the two parallel light beams. In the presence of material and production process tolerances, the coincidence of the parallel light beams at the receiving end and the transmitting end of the single-fiber bidirectional optical device can be achieved, thereby maximizing the coupling efficiency at the receiving and transmitting ends. Moreover, the design is simple, easy to implement and maintain.
[0030] In an embodiment of this embodiment, the Dove prism 5 is made of silicon. The Dove prism 5 made of silicon material has the advantages of low price, easy processing, high refractive index and smaller size, is more economical and practical, and is suitable for large-scale production.
[0031] Through the coupling of the Dove prism 5 made of silicon material, the height difference of the parallel light at the transmitting end is adjusted, so that the second parallel light and the third parallel light can be made to coincide, and the best coupling efficiency is obtained at the transmitting end; the coupling efficiencies at the transmitting end and the receiving end reach the best at the same time, which improves the coupling compatibility between the transmitting end and the receiving end, has a higher coupling efficiency, and can more effectively ensure the transmission efficiency and quality of the optical signal.
[0032] Furthermore, anti-reflection films are coated on the incident surfaces and the exit surfaces of the Dove prism 5, the collimating lens 4, and the focusing lens 7; an anti-reflection film is coated on the incident surface of the filter 6 corresponding to the laser 3, and a wavelength division thin film that allows special wavelengths to pass through is coated on the exit surface.
[0033] Furthermore, regarding the external structure of the single-fiber bidirectional optical device, in this embodiment, the entire optical device adopts the method of inserting the flexible board 1 into the cavity of the metal housing 2. The laser 3, the collimating lens 4, the filter 6, the focusing lens 7, and the detector 8 are all arranged in the cavity of the metal housing 2. The flexible board 1 is connected to the laser 3 and the detector 8 through ceramic gaskets and gold wires; the external lens 9 and the ferrule are arranged on the other side of the metal housing 2 relative to the flexible board 1.
[0034] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A single-fiber bidirectional optical device, characterized in that: It comprises a receiving optical component, a transmitting optical component, an external lens (9) and a core insert, wherein the transmitting optical component comprises a laser (3), a collimating lens (4), a Dove prism (5) and a filter (6), and the receiving optical component comprises a focusing lens (7) and a detector (8); The collimating lens (4) is arranged on the outgoing light path of the laser (3); the emitted light of the laser (3) is collimated by the collimating lens (4) into a first parallel light and emitted to the Dove prism (5); after internal reflection of the Dove prism (5), the second parallel light is refracted by the filter (6) to obtain the second parallel light; the second parallel light is coupled into the ferrule through the external lens (9); The focusing lens (7) is arranged on the incident light path of the detector (8); the third parallel light obtained by the external light source through the insert and the external lens (9) is deflected to the focusing lens (7) through the filter, and converged to the detector (8) through the focusing lens (7); the second parallel light and the third parallel light overlap.
2. The single-fiber bidirectional optical device according to claim 1, characterized in that: The dove prism (5) is made of silicon.
3. The single-fiber bidirectional optical device according to claim 1, characterized in that: The incident surface and the exit surface of the Dove prism (5) are both coated with anti-reflection films.
4. The single-fiber bidirectional optical device according to claim 1, characterized in that: The incident surface and the exit surface of the collimating lens (4) are both coated with anti-reflection films.
5. The single-fiber bidirectional optical device according to claim 1, characterized in that: The incident surface and the exit surface of the focusing lens (7) are both coated with anti-reflection films.
6. The single-fiber bidirectional optical device according to claim 1, characterized in that: The incident surface of the filter (6) corresponding to the laser (3) is coated with an anti-reflection film, and the output surface is coated with a wavelength division film.
7. The single-fiber bidirectional optical device according to any one of claims 1 to 6, characterized in that: The included angle between the filter (6) and the Dove prism (5) is 45°.
8. The single-fiber bidirectional optical device according to claim 7, characterized in that: The included angle between the focusing lens (7) and the filter (6) is 45°.