PLC optical waveguide-based RGB beam combination optical chip end face efficient coupling structure

Abstract

The utility model discloses a PLC optical waveguide-based RGB beam combination optical chip end face efficient coupling structure, relates to the technical field of optics and photoelectronics, and solves the problem that in the prior art, a lens is adopted for laser beam combination, and light loss is likely to be generated. The optical fiber combiner comprises an optical fiber array assembly, the lower portion of the optical fiber array assembly is connected with a bottom connecting piece, and the upper portion of the bottom connecting piece is connected with a beam combining chip arranged at the output end of the optical fiber array assembly in an abutting mode. The optical fiber array assembly and the beam combining optical chip are connected into a whole through the connecting plate, and the light emitting diode is simple in structure, low in cost, high in light emitting efficiency and convenient to process. The beam combining optical chip is arranged on the output light end face of the optical fiber array assembly in an abutting mode, end face coupling of the optical fiber array assembly and the beam combining optical chip is achieved, no connecting glue exists in the optical path transmission process, and the problem of optical loss caused by pasting glue in an optical path is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical and optoelectronic technology field, especially a kind of coupling structure of RGB beam combining light source. BACKGROUND

[0002] In prior art, the coupling of PLC (planar lightwave circuit) optical waveguide RGB beam combining light chip adopts traditional optical coupling mode, which relies on complex optical elements, such as TO laser, COC laser, lens, isolator and other devices, to couple using spatial light. The use of traditional lens optical elements often leads to large optical loss, especially in the case of large laser beam angle or inconsistent wavelength, the loss is particularly significant, and the lens needs to be specifically selected. Low integration: lens coupling requires complex optical components and complex structure design, resulting in a large system and difficulty in integration and rapid assembly, limiting the size and application range of the optical system. Light source stability problem: different wavelengths of light sources are easily disturbed by factors such as thermal effects or optical element asymmetry during beam combining, leading to unstable light sources and affecting system performance. In optical communication, active optical chips are usually coupled with passive optical waveguide chips through FA (fiber array) high-efficiency end-face point gluing. Due to the characteristics of blue light in RGB, the end-face point gluing of the optical path faces certain limitations.

[0003] In prior art, a high-power semiconductor laser fiber coupling structure disclosed in Chinese Utility Model Patent No. CN211605644U, published on September 29, 2020, includes an optical waveguide assembly connected in order by an entrance, an entrance section, a connection port, an exit section, and an exit. The outer diameter of the entrance section gradually decreases from the entrance to the connection port. The outer diameter of the exit section matches the corresponding optical fiber. The exit is connected to the corresponding optical fiber. The light emitted by multiple laser chips is optically shaped and beam combined through conventional methods, projected into an entrance, and then sequentially passes through the entrance section, the connection port, the exit section, and the exit. The light is then introduced from one end of the optical fiber, transmitted through the optical fiber, and output from the other end of the optical fiber. This structure has the advantage of small loss of output power of the laser even if the incident beam is slightly misaligned with the entrance. Although this patent discloses a coupling structure that can use a light-emitting chip in combination with an optical fiber to achieve beam coupling by restraining the optical fiber at the exit, it still has the problem of optical loss caused by the use of lenses in actual use. UTILITY MODEL CONTENT

[0004] To address the deficiencies in the background art, the utility model provides a PLC optical waveguide RGB beam combining light chip end-face high-efficiency coupling structure, which solves the problems of complex coupling process and low batch production efficiency in the prior art, achieves blue light path glue-free end-face coupling effect, and increases coupling reliability.

[0005] The technical scheme of the utility model is as follows: a kind of PLC-based light waveguide RGB beam combining optical chip end face efficient coupling structure, including optical fiber array assembly, the lower part of optical fiber array assembly is connected with bottom connecting plate, the upper part of bottom connecting plate is connected with beam combining optical chip by being arranged on the output end face of optical fiber array assembly.

[0006] Further preferably, the optical fiber array assembly includes an optical fiber array, and the input end of the optical fiber array is provided with a first optical fiber, and the first optical fiber is connected with an optical fiber connector.

[0007] Further preferably, the beam combining optical chip is provided with an optical waveguide corresponding to the first optical fiber.

[0008] Further preferably, the bottom connecting plate is a silicon-based gasket.

[0009] Further preferably, a point adhesive is pasted on the silicon-based gasket, and the silicon-based gasket is connected with the lower end face of the optical fiber array and the lower end face of the beam combining optical chip through the point adhesive.

[0010] Further preferably, the input end of the optical fiber array assembly is detachably connected with a light emitting element.

[0011] Further preferably, the light emitting assembly is a laser.

[0012] Further preferably, the output end of the laser is connected with a second optical fiber corresponding to the first optical fiber.

[0013] Further preferably, the second optical fiber and the laser are of an integrated structure, and the second optical fiber is detachably connected with the optical fiber connector.

[0014] Further preferably, the laser is an RGB laser.

[0015] The utility model has the advantages that the optical fiber array assembly and the beam combining optical chip are connected into a whole through the connecting plate, the structure is simple, the cost is low, the light emitting efficiency is high, and the processing is convenient. The beam combining optical chip is arranged on the output light end face of the optical fiber array assembly, the end face coupling of the optical fiber array assembly and the beam combining optical chip is realized, there is no connecting adhesive in the optical path transmission process, and the problem of light loss caused by the adhesive in the optical path is avoided. Meanwhile, the connecting structure of the optical fiber assembly, the light emitting element and the beam combining assembly is simple, the cost is low, and the light emitting efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a top view of the utility model;

[0018] Figure 2 is a front view of the utility model.

[0019] In the figure: 1, laser, 2, first optical fiber, 3, optical fiber connector, 4, bottom connecting plate, 5, optical fiber array, 6, beam combining optical chip, 7, optical waveguide, 8, second optical fiber. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0021] As shown in Figure 1 and Figure 2 shown, embodiment 1, a kind of based on PLC optical waveguide RGB beam combining optical chip end face high-efficiency coupling structure, including optical fiber array assembly, the lower part of optical fiber array assembly is connected with bottom connecting plate 4, the upper part of bottom connecting plate 4 is connected with the beam combining optical chip 6 for being arranged on the output end face of optical fiber array assembly.Light fiber array assembly and beam combining optical chip are connected into a whole by bottom connecting plate, simple structure, low cost, optical fiber array assembly and beam combining optical chip are arranged, the output end face of optical fiber array assembly and the input end face of beam combining optical chip are arranged, without sticking glue, high luminous efficiency, easy to process.Beam combining optical chip is arranged on the output light end face of optical fiber array assembly, realizes the end face coupling of optical fiber array assembly and beam combining optical chip, without the existence of connecting glue in the process of optical transmission, solve the pain point of complex coupling process, low batch production efficiency in prior art, simultaneously achieve the end face coupling effect of blue light path without glue, increase coupling reliability.Optical fiber array assembly and the end face coupling of beam combining optical chip are high-efficiency coupling mode, especially for the coupling technology of RGB beam combining light source, it has important significance to improve the performance of optoelectronic system and integrated optical device.

[0022] In the embodiment, the optical fiber array assembly includes optical fiber array 5, the input end of optical fiber array 5 is provided with first optical fiber 2, and optical fiber connector 3 is connected to first optical fiber 2. The beam combining optical chip 6 is provided with the optical waveguide 7 corresponding to the first optical fiber 2. The beam combining optical chip 6 is a PLC-RGB beam combining optical chip. The PLC-RGB beam combining optical chip is provided with an RGB optical waveguide chip corresponding to the first optical fiber 2, and a beam combining end is arranged on the beam combining optical chip 6 to realize light beam combining, which can realize lossless output of light source with high efficiency.

[0023] In the embodiment, the bottom connecting plate 4 is a silicon-based pad. The silicon-based pad is connected with the lower end face of the optical fiber array 5 and the lower end face of the beam combining optical chip 6 through the point gluing, so that the output end face of the optical fiber array is coupled with the input end face of the beam combining optical chip, and the end face coupling formed reaches the state of no glue in the transmission optical path. The lower end faces of the optical fiber array 5 and the beam combining optical chip 6 are both fixed on the silicon-based pad through the point gluing, and there is no adhesive on the bonding surface of the optical fiber array 5 and the beam combining optical chip 6, which avoids the problem of light loss caused by the connection glue in the light transmission process, and improves the light transmission efficiency.

[0024] As shown in Figure 1 and Figure 2 Embodiment 2, a high-efficiency end face coupling structure based on a PLC optical waveguide RGB beam combining optical chip, the input end of the optical fiber array assembly is detachably connected with a light emitting element. The light emitting assembly is a laser 1. The laser 1 is an RGB laser. The RGB laser is a packaged external power supply, and the light source has good stability. The R, G and B laser light sources emitted by the laser 1 are transmitted through optical fibers. The R, G and B laser light sources are efficiently end face coupled with the RGB beam combining optical chip, and are applied to the fields of optical communication, laser display, optical sensor, laser radar, optical element integration, optical imaging and the like, and are suitable for various optoelectronic systems and integrated optical devices which need to combine and efficiently couple RGB laser sources.

[0025] In the embodiment, the output end of the laser 1 is connected with a second optical fiber 8 corresponding to the first optical fiber 2. The number of the second optical fibers corresponds to the number of the lasers. The second optical fiber and the laser 1 are in an integrated structure, and the second optical fiber 8 is detachably connected with the optical fiber connector 3. The second optical fiber and the laser 1 are inserted and matched, and the packaging form of the insertion and matching can adopt the TOSA packaging form of TO56, and the connection in the plug-in mode can achieve the effect of quick replacement.

[0026] The other structures are the same as those in embodiment 1.

[0027] Specifically, the RGB laser provides the required light source, the laser with a fiber tail package can be quickly plugged in and replaced with the optical fiber array through the optical fiber connector, and the production efficiency is improved; the optical fiber connector can match various forms of optical fiber connectors to quickly connect the coupled optical chip assembly and the laser; the silicon-based pad provides a bottom gluing platform for the FA and the optical chip, and the optical fiber array and the silicon-based chip, the RGB beam combining optical chip and the bottom contact surface of the silicon-based pad are fixed through point gluing, so as to achieve the effect of no glue in the optical path and realize the end face coupling of the RGB beam combining optical chip and the FA; the optical fiber array FA matches the optical waveguide pitch to manufacture the optical fiber array.

[0028] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure, characterized in that, The optical fiber array assembly comprises a bottom connecting plate (4) connected to the lower part of the optical fiber array assembly, and a beam combining optical chip (6) arranged on the output end surface of the optical fiber array assembly is connected to the upper part of the bottom connecting plate (4). 2.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 1, characterized in that, The optical fiber array assembly comprises an optical fiber array (5), and a first optical fiber (2) is arranged on the input end of the optical fiber array (5), and an optical fiber connector (3) is connected to the first optical fiber (2). 3.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 2, characterized in that, The beam combining optical chip (6) is provided with an optical waveguide (7) corresponding to the first optical fiber (2).

4. The PLC-based optical waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 2 or 3, characterized in that, The bottom connecting plate (4) is a silicon-based gasket. 5.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 4, characterized in that, A point adhesive is pasted on the silicon-based gasket, and the silicon-based gasket is connected to the lower end surface of the optical fiber array (5) and the lower end surface of the beam combining optical chip (6) through the point adhesive. 6.The PLC-based light waveguide RGB beam-combining optical chip end face efficient coupling structure according to claim 3 or 5, characterized in that, The input end of the optical fiber array assembly is detachably connected with a light emitting element.

7. The PLC-based optical waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 6, characterized in that, The light emitting element is a laser (1). 8.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 7, characterized in that, The output end of the laser (1) is connected with a second optical fiber (8) corresponding to the first optical fiber (2). 9.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 8, characterized in that, The second optical fiber (8) and the laser (1) are in an integrated structure, and the second optical fiber (8) is detachably connected with the optical fiber connector (3). 10.The PLC-based light waveguide RGB beam-combining optical chip end-face efficient coupling structure according to claim 9, characterized in that, The laser (1) is an RGB laser.

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