2*4 optical bridge for free space

Abstract

The invention relates to a 2*4 optical bridge for a free space. The 2*4 optical bridge is provided with a piece of standard isosceles right-triangular optical glass, a quarter-wave plate, a first half-wave plate, a second half-wave plate, a third half-wave plate, a first polarization beam splitter, a second polarization beam splitter, a third polarization beam splitter, a first half-pentagonal prism, a second half-pentagonal prism, a third half-pentagonal prism and a fourth half-pentagonal prism, wherein the first half-wave plate, the second half-wave plate and the third half-wave plate are same in structure; the first polarization beam splitter, the second polarization beam splitter and the third polarization beam splitter are same in structure; and the first half-pentagonal prism, the second half-pentagonal prism, the third half-pentagonal prism and the fourth half-pentagonal prism are same in structure. A signal laser and a local oscillator laser are linked and a required phase shift is generated, so as to further perform photo-electric conversion, signal demodulation and phase lock. The optical bridge is one of the key parts of a coherent light communication system. The 2*4 optical bridge for the free space has the advantages of simple structure, stable and reliable property and small loss, is suitable for laser coherent communication of the free space, and has the characteristics of miniaturization, light weight, easiness in integration, and the like.

Description

technical field [0001] The invention relates to an optical bridge, especially a free space 2×4 optical bridge, which can generate four-channel synthetic light beams with 90-degree phase shift and different intervals, can perform balanced reception, and realize space 2×4 bridging, and is mainly used in space laser communication. Background technique [0002] The coherent communication system is an important research direction for large-capacity, high-bit-rate laser communication systems, especially in inter-satellite laser communication systems. The receiving end of a coherent optical homodyne communication channel is composed of a local laser oscillator, an optoelectronic receiver, a phase-locked loop, an optical bridge (Hybrid) and a signal optical receiving optical circuit. The optical bridge links the signal laser and the local oscillator laser to the photoelectric receiver and makes it produce the required phase relationship. The performance of the optical bridge determ...

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Problems solved by technology

The output beams are arranged in a matrix form, which cannot achieve parallel output on the same plane

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