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CN-121995581-A - Optical fiber coupler and optical communication system

CN121995581ACN 121995581 ACN121995581 ACN 121995581ACN-121995581-A

Abstract

The embodiment of the application relates to the technical field of optical communication and discloses an optical fiber coupler and an optical communication system. The optical fiber coupler comprises a first micro lens array, a beam displacement prism and a second micro lens array, wherein the first micro lens array is used for collimating array beams incident on the first micro lens array to form first collimated array beams, the beam displacement prism comprises a light transmission area and a reflection displacement area which are matched with the first collimated array beams, the first collimated array beams form second collimated array beams through the light transmission area and the reflection displacement area, and the parameters of sub beams are unchanged relative to the first collimated array beams, so that the distance between optical axes of different sub beams is enlarged or reduced. The coupling of optical fiber signals is realized through the first micro lens array, the light beam displacement prism and the second micro lens array, the process is simple, the control is easy, the yield is high, and the micro lens array is adopted to greatly reduce the volume of the product.

Inventors

  • HE CHUN

Assignees

  • 西安炬光科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. The optical fiber coupler is characterized by comprising a first micro lens array, a light beam displacement prism and a second micro lens array, wherein: The first micro lens array is used for collimating array light beams incident to the first micro lens array to form first collimated array light beams, and the number, the arrangement mode and the optical parameters of the micro lenses in the first micro lens array are matched with the array light beams incident to the first micro lens array; The beam displacement prism comprises a light transmission area and a reflection displacement area which are matched with the first collimating array beam, wherein the first collimating array beam forms a second collimating array beam through the light transmission area and the reflection displacement area; The second micro lens array is used for focusing the second collimation array light beams to form output array light beams, and the number, the arrangement mode and the optical parameters of the micro lenses in the second micro lens array are matched with the second collimation array light beams.
  2. 2. The fiber optic coupler of claim 1, wherein the microlens parameters in the second microlens array are the same as the microlens parameters in the first microlens array.
  3. 3. The fiber optic coupler of claim 1, wherein some of the sub-beams of the first collimated array beam propagate in a straight line through the light transmissive region, another of the sub-beams of the first collimated array beam propagate in a radial direction through a reflective channel defined by the reflective displacement region, and all of the paths along which the sub-beams exit are all parallel to each other and to the first collimated array beam, forming a second collimated array beam.
  4. 4. An optical communication system, comprising the optical fiber coupler according to any one of claims 1 to 3, and further comprising an input end and an output end, wherein the input end is used for inputting a preset number, an arrangement manner and an optical parameter of array light beams to the optical fiber coupler, and the output end is used for receiving the output array light beams of the optical fiber coupler.
  5. 5. The optical communication system of claim 4, wherein the input end is a multi-core optical fiber and the output end is a fiber bundle.
  6. 6. The optical communication system of claim 4 or 5, wherein the arrangement of the microlenses in the first microlens array matches the arrangement of the cores of the multicore fibers, and wherein the light transmission region and the reflection displacement region of the beam displacement prism are arranged according to a multiple of the expansion of the distance between the output array beam and the optical axis of the input array beam.
  7. 7. The optical communication system of claim 4 or 5, wherein the arrangement of microlenses in the second microlens array matches the arrangement of beam displacement prisms and the optical fiber bundles.
  8. 8. The optical communication system of claim 4, wherein the input end is a fiber optic bundle and the output end is a multi-core fiber.
  9. 9. The optical communication system according to claim 4 or 8, wherein the arrangement of the micro lenses in the second micro lens array matches the arrangement of the cores of the optical fiber bundles, and wherein the light transmitting area and the reflecting displacement area of the beam displacement prism are arranged according to a preset multiple of the reduction of the distance between the output beam and the optical axis of the input beam.
  10. 10. The optical communication system of claim 4 or 8, wherein the arrangement of microlenses in the first microlens array matches the arrangement of beam displacement prisms and the optical fiber bundles.

Description

Optical fiber coupler and optical communication system Technical Field The embodiment of the application relates to the technical field of optical communication, in particular to an optical fiber coupler and an optical communication system. Background The multi-core fiber (Multicore fiber, MCF) technology was developed to increase the data traffic channels. At the beginning of the multi-core fiber signal transmission, the multi-core fibers need to be coupled into manageable standard fibers in order for the optical signals to be processed and connected to their respective transmitters. At the end of the multi-core fiber signal transmission, the light carrying the signal in the core needs to be split into another bundle of fibers containing standard fibers and the signal directed to its corresponding receiver. And vice versa. Currently, fiber couplers are made using a biconical fusion technique, where a bundle of optical fibers is tightly bundled together and heated by a controlled slow pull process to create an adiabatic taper. When the relative positions of the cores in the attenuated fiber bundle match the relative positions of the cores in the multicore fiber, the heating and pulling process is stopped and cleaved into flat and smooth end faces, which are then fusion spliced to the multicore fiber by a fusion splicer. The manufacturing process of the optical fiber coupler is very complex, difficult to control, very low in yield and large in size. Disclosure of Invention In view of the above problems, embodiments of the present application provide an optical fiber coupler and an optical communication system, which are used for solving at least one technical problem of complex manufacturing process, difficult control, low yield and huge volume of the existing optical fiber coupler. According to one aspect of an embodiment of the present application, there is provided an optical fiber coupler including a first microlens array, a beam displacement prism, and a second microlens array, wherein: The first micro lens array is used for collimating array light beams incident to the first micro lens array to form first collimated array light beams, and the number, the arrangement mode and the optical parameters of the micro lenses in the first micro lens array are matched with the array light beams incident to the first micro lens array; The beam displacement prism comprises a light transmission area and a reflection displacement area which are matched with the first collimating array beam, wherein the first collimating array beam forms a second collimating array beam through the light transmission area and the reflection displacement area; The second micro lens array is used for focusing the second collimation array light beams to form output array light beams, and the number, the arrangement mode and the optical parameters of the micro lenses in the second micro lens array are matched with the second collimation array light beams. The coupling process of the optical fiber signals is realized through the first micro lens array, the light beam displacement prism and the second micro lens array, the coupling process is simple and easy to control, the yield is high, and the micro lens array is adopted to greatly reduce the volume of the product. In an alternative, the microlens parameters in the second microlens array are the same as the microlens parameters in the first microlens array. The microlens parameters are identical, making the processing of the beam more standard and uniform. In an alternative manner, part of the sub-beams of the first collimated array beam propagate along a straight line through the light transmission area, and the other part of the sub-beams of the first collimated array beam propagate along a radial direction through a reflection channel formed by the reflection displacement area, and paths of all the sub-beams are all parallel to each other and parallel to the first collimated array beam to form a second collimated array beam. Through the arrangement of different areas, sub-beams at different positions are transmitted according to a preset propagation direction, and the purpose of separating or shrinking the array beam optical axis distance is achieved. According to another aspect of the embodiment of the present application, an optical communication system is provided, which includes the optical fiber coupler, and further includes an input end and an output end, where the input end is configured to input array beams of a preset number, an arrangement manner and optical parameters to the optical fiber coupler, and the output end is configured to receive output array beams of the optical fiber coupler. The input signal and the output signal of the optical fiber coupler are transmitted into the optical communication system through the input end and the output end. In an alternative manner, the input end is a multi-core optical fiber and the output end is an optical fiber bundle. The mode