Spatial optical 90-degree mixer with high mixing efficiency

Abstract

The invention discloses a free spatial optical 90-degree mixer device, belonging to the technical field of wireless communications. For solving the problems of the prior art, the device comprises a local oscillator laser, an expanded beam collimating lens, a positive lens, an electronic control polarizer, a first non-polarized beam splitter, a second non-polarized beam splitter, a third non-polarized beam splitter, a first polarized beam splitter, a second polarized beam splitter, a first right-angled reflecting prism, a second right-angled reflecting prism, a third right-angled reflecting prism, a first parallel flat plate, a second parallel flat plate, a first quarter wave plate, a second quarter wave plate, a balance detector, an electric power divider, an electronic control polarizer control circuit and a third quarter wave plate. Light spots of local oscillator light are converted into Airy disks by using the expanded beam collimating lens and the positive lens; the polarization state is controlled by the electronic control polarizer, the electric power divider, the electronic control polarizer control circuit and the third quarter wave plate, to realize consistent polarization state of the local oscillator light and signal light, so that the defect of loss of signal light energy in the original polarization control device is overcome.

Description

technical field [0001] The invention relates to a free space laser communication device, in particular to a space light 90° mixer with high frequency mixing efficiency, which belongs to the technical field of wireless communication. Background technique [0002] Laser wireless communication is a very important communication method in the field of wireless communication because of its advantages such as large communication capacity, high transmission rate, good confidentiality, strong anti-electromagnetic interference ability, light weight, small size, and low power consumption. In the field of high-speed wireless communication between ground and satellites, occasions that require high security and confidentiality of communication content (such as government, military department, security department), or places with strong electromagnetic interference (such as battlefields) and many other occasions have potential application prospects. [0003] Coherent laser communication, ...

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the poor environmental adaptability of existing spatial light 90° mixers, low mixing efficiency caused by mismatching of local oscillator light and signal light spot, mismatch of polarization angle, difficulty in detecting and controlling the polarization state of weak signal light, and overall structure Complicating matters, a high-mixing-efficiency spatial-optical 90° mixer is proposed

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