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CN-116577875-B - Wavelength selective switch

CN116577875BCN 116577875 BCN116577875 BCN 116577875BCN-116577875-B

Abstract

The invention provides a wavelength selective switch. The wavelength selective switch comprises an input end, a beam shaping element, a super-surface grating, a channel switching reflection element and an output end, wherein the beam shaping element is used for shaping composite light of the input end, the super-surface grating is positioned on the light emitting side of the beam shaping element and used for diffracting and splitting the composite light passing through the beam shaping element to form a plurality of single-wavelength lights, the channel switching reflection element is used for receiving and reflecting the plurality of single-wavelength lights, the output end is used for receiving the plurality of single-wavelength lights reflected by the channel switching reflection element, and the output end is a plurality of and corresponds to the plurality of single-wavelength lights one by one. The invention solves the problems of complex optical path and low transmission efficiency of the wavelength selective switch in the prior art.

Inventors

  • CHEN HAIFENG
  • Xin duo
  • SUN LEI

Assignees

  • 苏州山河光电科技有限公司

Dates

Publication Date
20260508
Application Date
20230530

Claims (11)

  1. 1. A wavelength selective switch comprising, in order along a light transmission direction: An input (10); -a beam shaping element (20), the beam shaping element (20) being arranged to shape the composite light of the input end (10); A super-surface grating (30), the super-surface grating (30) being located on the light-emitting side of the beam shaping element (20), the super-surface grating (30) being configured to diffract the composite light passing through the beam shaping element (20) to form a plurality of single-wavelength lights; The channel switching reflection element is used for receiving the plurality of single-wavelength lights and reflecting the single-wavelength lights; The output end (60) is used for receiving the plurality of single-wavelength lights reflected by the channel switching reflection element, the output ends (60) are a plurality of, and the plurality of output ends (60) are in one-to-one correspondence with the plurality of single-wavelength lights; the wavelength selective switch further comprises an optical path analysis element (40), wherein the optical path analysis element (40) is positioned between the super-surface grating (30) and the channel switching reflection element, and the optical path analysis element (40) is used for analyzing and shaping incident light.
  2. 2. Wavelength selective switch according to claim 1, characterized in that at least one side surface of the optical path analysis element (40) has a super surface structure.
  3. 3. Wavelength selective switch according to claim 1, characterized in that the optical path analysis element (40) comprises a plurality of analysis units (41), a plurality of the analysis units (41) being arranged in an array, different ones of the analysis units (41) being adapted to analyze and shape light of different wavelengths.
  4. 4. A wavelength selective switch according to claim 3, characterized in that each of said analysis units (41) has an independent super surface structure, said super surface structures of different analysis units (41) being different.
  5. 5. The wavelength selective switch according to claim 1, wherein said input end (10) and said plurality of output ends (60) are located at a side of said beam shaping device remote from said super-surface grating (30), and light of a plurality of wavelengths reflected by said channel switching reflection element passes through said optical path analysis element (40), said super-surface grating (30) and said beam shaping element (20) in order and then enters into a plurality of said output ends (60) correspondingly.
  6. 6. The wavelength selective switch according to claim 1, further comprising one or more mirrors (70), at least one of said mirrors (70) being arranged between said light path analysis element (40) and said channel switching reflection element for effecting a deflection of a light path between said light path analysis element (40) and said channel switching reflection element.
  7. 7. The wavelength selective switch according to claim 1, wherein the super surface grating (30) is a transmissive super surface grating or a reflective super surface grating.
  8. 8. Wavelength selective switch according to claim 1, characterized in that said ultra-surface grating (30) comprises a plurality of microstructures (31) within one period, each of said microstructures (31) comprising a plurality, the shape of the microstructures (31) of different species being different, the shape and size of the microstructures (31) of the same species being the same.
  9. 9. The wavelength selective switch according to claim 1, wherein said channel switching reflective element is a micro-mirror array (50), said micro-mirror array (50) comprising a plurality of micro-lenses, each of said micro-lenses having a reflective surface, different ones of said micro-lenses being adapted to reflect light of different wavelengths, the angle of reflection of each of said micro-lenses being adjustably set for light.
  10. 10. Wavelength selective switch according to one of claims 1 to 9, characterized in that the input (10) is an input collimator and/or the output (60) is an output collimator.
  11. 11. The wavelength selective switch according to any one of claims 1 to 9, wherein said beam shaping element (20) comprises one of a beam expanding lens and a prism.

Description

Wavelength selective switch Technical Field The invention relates to the technical field of optical communication equipment, in particular to a wavelength selective switch. Background With the increasing importance of high-speed data transmission and mass information processing in the communication industry, new products with higher performance and reliability are required to be introduced. Meanwhile, all-optical networks are sinking from backbones and metro cores to metro convergence and access layers to provide end-to-end reachability and flexibility of optical signals. Wavelength selective switches (WAVELENGTH SELECTIVE SWITCH, abbreviated WSS), which are an important component of reconfigurable optical add-drop multiplexers (Reconfigurable OpticalAdd-Drop Multiplexing, abbreviated ROADMs), face the need for more channels, greater bandwidth, and at the same time, miniaturization and low cost. Currently, three main technologies for implementing wavelength selective switches are Micro-electromechanical system (Micro-ElectroMechanical System, abbreviated as MEMS), liquid Crystal (LC) technology, and Liquid Crystal On Silicon (LCOS) chip (Liquid Crystal on Silicon, abbreviated as LCOS). The diffraction beam splitting element used in the three techniques is a traditional reticle grating, the reticle grating has large insertion loss and poor light transmission efficiency, meanwhile, the reticle grating is a polarization sensitive element and can only play a role in diffraction beam splitting on ordinary rays (o rays) parallel to the reticle direction, so that before a light beam enters the reticle grating, a polarization beam splitting prism or a birefringent crystal YVO4 is needed to separate the ordinary rays (o rays) and the extraordinary rays (e rays) of the light beam, and a polarization conversion element such as a half wave plate is needed to convert the o rays into the e rays, so that the polarization directions of the two output light beams are the same and are p rays relative to the reticle grating. In the process of returning the light beam, after passing through the reticle grating, part of the e light is converted into o light, and the o light and the e light are combined, so that the light spot is compressed, and the proportion of the o light and the e light is balanced. This adds to the cost of materials and complicates engineering assembly. That is, the wavelength selective switch in the prior art has problems of complicated optical paths and low transmission efficiency. Disclosure of Invention The invention mainly aims to provide a wavelength selective switch so as to solve the problems of complex optical path and low transmission efficiency of the wavelength selective switch in the prior art. In order to achieve the above purpose, the invention provides a wavelength selective switch, which comprises an input end, a beam shaping element, a super-surface grating, a channel switching reflection element and an output end, wherein the input end is sequentially arranged along the transmission direction of light, the beam shaping element is used for shaping composite light of the input end, the super-surface grating is positioned on the light emitting side of the beam shaping element and used for diffracting and splitting the composite light passing through the beam shaping element to form a plurality of single-wavelength lights, the channel switching reflection element is used for receiving and reflecting the plurality of single-wavelength lights, the output end is used for receiving the plurality of single-wavelength lights reflected by the channel switching reflection element, and the output end is a plurality of the output ends and corresponds to the plurality of single-wavelength lights one by one. Further, the wavelength selective switch further comprises an optical path analysis element, wherein the optical path analysis element is positioned between the super-surface grating and the channel switching reflection element and is used for analyzing and shaping incident light. Further, at least one side surface of the optical path analysis element has a super-surface structure. Further, the optical path analysis element comprises a plurality of analysis units, the analysis units are arranged in an array, and different analysis units are used for analyzing and shaping light with different wavelengths. Further, each analysis unit has an independent super-surface structure, and the super-surface structures of different analysis units are different. Further, the input end and the plurality of output ends are both positioned on one side of the beam shaping device, which is far away from the super-surface grating, and the light with multiple wavelengths reflected by the channel switching reflection element sequentially passes through the light path analysis element, the super-surface grating and the beam shaping element and then correspondingly enters the plurality of output ends. Further, the waveleng