Optical mixer based on metasurface material and its preparation method

Abstract

The invention discloses an optical mixer based on super-surface materials and a preparation method of the optical mixer, and relates to the field of optical mixers. The optical mixer comprises a circularly polarized light beam splitter and two same mixer bodies, each mixer body comprises a space light beam splitter, four phase shifters and four square lenses, the circularly polarized light beam splitter, the space light beam splitters and the phase shifters are made of the super-surface materials, the super-surface materials are divided into a plurality of uniform cells, each cell comprises asilicon dioxide base and silicon nano-brick arrays, the silicon nano-brick arrays are periodically distributed on the silicon dioxide base, corners of the silicon nano-brick arrays are periodically distributed according to regular rules, and each periodically-distributed silicon nano-brick array comprises a plurality of uniformly-distributed rectangular silicon nano-brick with different facing directions. The optical mixer based on the super-surface materials is low in insertion loss, accurate in phase adjustment, high in device integration level and simple in preparation process.

Description

technical field [0001] The invention relates to the field of optical mixers, in particular to an optical mixer based on a metasurface material and a preparation method thereof. Background technique [0002] The optical mixer is a key optical device in a coherent optical communication system. Its function is to coherently mix two beams of signal light with similar frequency, constant phase difference, and the same polarization direction with the local oscillator light wavefront, and then use the subsequent photoelectric The balanced detector and the signal recovery processing circuit process the mixed frequency signal. [0003] The commonly used 90° optical mixer has a 2-input and 4-output port structure. The two inputs include the signal light S transmitted by the optical fiber and the local oscillator light L generated by the laser at the receiving end. The relative phase differences of S and L of the four output ports are 0 respectively. °, 180°, 90° and 270° (that is, S+...

AI Technical Summary

Problems solved by technology

Traditional optical mixers are composed of discrete optical components such as quarter-wave plates, half-wave plates, and polarization beam splitters, so the device integration level is relatively low

The optical mixer in optical fiber communication can also adopt an all-fiber structure or a planar waveguide structure. The all-fiber structure has lower insertion loss than the block optical structure, but the manufacturing process is relatively complicated, and it is not easy to implement in the laboratory.

[0005] In summary, the existing optical mixers have the defects of large insertion loss, low device integration, and complicated manufacturing process.

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