Optical mixer for reflective coherent receivers

Abstract

The invention relates to an optical mixer for reflective coherent receives, belongs to optical devices of optical fiber communication and solves the problem that existing optical mixers are non-compact in structure and poor in temperature stability. A polarization separator, a 1 / 2 wave plate, a phase shift plate, a first shift crystal, a 1 / 4 wave plate and a combined reflecting mirror are sequentially arranged along an incident light path, and the 1 / 4 wave plate, the first shift crystal, the 1 / 2 wave plate and a second shift crystal are sequentially arranged on a reflecting light path of the combined reflecting mirror, wherein the 1 / 2 wave plate, the first shift crystal and the 1 / 4 wave plate are shared devices. Polarization separating is realized through a polarization separation prism, 90-degree phase shift is realized through the phase shift plate, safe-phase and orthogonal output light required is obtained by adopting the reflecting structure, birefringent crystals, the 1 / 4 wave plate, the 1 / 2 wave plate and the combined reflecting mirror, and polarization and phase diversity control is realized. The optical mixer is compact in integral structure, mature in processing technique of various devices, good in temperature stability and high in polarization extinction ratio, and can be used for optical signal coherent modulation by advanced modulation formats and polarization multiplexing way in the optical fiber communication.

Description

technical field [0001] The invention belongs to an optical device for optical fiber communication, and in particular relates to a reflective coherent receiver optical mixer, which is used to realize coherent reception and demodulation of optical signals transmitted in optical fibers using polarization multiplexing and advanced modulation formats. Background technique [0002] In recent years, with the continuous upgrading of optical fiber communication systems, optical signals transmitted in optical fibers have begun to use advanced modulation formats and present the characteristics of carrying information in the entire field (amplitude, frequency, phase, polarization). In view of this feature, the coherent detection method must be used at the receiving end of the system to obtain all the information carried by the optical signal. The hexadecimal quadrature amplitude modulation (DP-16QAM) format using polarization multiplexing is a typical optical signal multiplexing and mod...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a reflective coherent receiver optical mixer, which solves the problems of uncompact structure and poor temperature stability of existing optical mixers

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