Spatial light-to-fiber coupling system

Abstract

The invention discloses a spatial light-to-fiber coupling system. The system comprises a pyramid prism, an inclined reflector, a light splitter, a first lens, a three-dimensional translation table, a1*2 optical fiber beam splitter, a calibration laser device, a receiving terminal, a photoelectric detector, a second lens, a first driver, a control processor and a second driver. The principle thatthe pyramid prism can return incident light in the original direction is used, and the zero point of the fiber axis is calibrated through the calibration laser device and the pyramid prism. After thespace light to be coupled enters the photoelectric detector and a fiber branch, the control processor acquires light spot data of the photoelectric detector and controls the inclined reflector to moveby taking the zero point of the fiber axis as a benchmark, and the optical axis deviation between the spatial light and a fiber is corrected so that the spatial light can be coupled into the fiber. The system is used for correcting light beam jitter and the optical axis deviation caused by atmospheric disturbance, environment vibration, temperature and gravity changes and the like, the coupling efficiency of the spatial light and the fiber is improved, and the system has an important application prospects in the field of spatial laser communication.

Description

technical field [0001] The invention belongs to the field of spatial light and fiber optics, and in particular relates to a spatial light-to-fiber coupling system. Background technique [0002] Space laser communication technology uses laser beams as the carrier to transmit space information. Compared with traditional microwave communication, it has the characteristics of wide frequency range, strong confidentiality, anti-electromagnetic interference, and no need to apply for frequency bands. The space laser carrier usually uses an optical antenna as the receiving terminal, and couples the space light into a single-mode or multi-mode fiber for information transmission and demodulation. Space light to fiber coupling technology is one of the key technologies of space laser communication, but space light is subject to beam jitter and optical axis deviation caused by atmospheric disturbance, environmental vibration, temperature and gravity changes, etc., making it difficult to ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to overcome the difficulties of initial alignment of the optical axis when coupling the existing spatial light to the optical fiber, the low bandwidth of the SPGD algorithm and the insufficiency of falling into a local optimal solution, and propose a spatial light to optical fiber coupling system

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