An Adaptive Fiber Coupling or Collimator Control System for Two-way Transmitting and Receiving of Laser Beams

Abstract

The invention discloses a self-adaptive optical fiber coupler or collimator control system capable of bilaterally receiving and transmitting laser beams. The self-adaptive optical fiber coupler or collimator control system comprises a coupling or collimating lens, a connecting sleeve, an optical fiber end face positioner, a first optical fiber, a three-port optical fiber circulator, a second optical fiber, a third optical fiber, a laser, a photoelectric detector, a control platform and a high-voltage amplifier, wherein the optical fiber end face positioner comprises a flexible crossed beam, a bimorph driver, a damping material, a boss and a fixed seat. Due to the adoption of the self-adaptive optical fiber coupler or collimator control system, the light beam arriving angle errors caused by factors such as atmosphere turbulence, mechanical vibration, thermal distortion and the like can be corrected adaptively; and meanwhile, according to the reversibility principle of a light path, the transmitting angle correction of emitted collimating light beams is also realized. The self-adaptive optical fiber coupler or collimator control system has an important application prospect in the field of optical fiber-based laser space application, such as free space laser communication, laser precise positioning and laser radar.

Description

technical field [0001] The invention relates to an adaptive optical fiber coupling or collimator control system for two-way transmission and reception of laser beams, which can be used in optical fiber-based space laser application fields such as free space laser communication, laser atmospheric transmission, laser precision positioning, and laser radar. Background technique [0002] In the fiber-based space laser system, how to improve the space light coupling efficiency and reduce the signal-to-noise ratio is one of the key technical problems to be solved. In fact, due to atmospheric turbulence effects, mechanical platform vibration, and thermal distortion, the laser beam reaching the receiving end will produce an angle error, which greatly affects the fiber coupling efficiency. At the same time, factors such as atmospheric turbulence effects, mechanical platform vibration, and thermal distortion will also cause angle errors in the emitted laser beam, which affects the acc...

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Problems solved by technology

[0003] Chinese patent application [201110460843.6] "Efficient Spatial Light-Fiber Dynamic Coupling Method" proposes to use the PID control circuit to dynamically control the driving voltage of the liquid crystal phase controller according to the strength of the detected light signal, and change the phase of the converging beam to achieve efficient dynamic coupling. The control accuracy of the system is not high, and there are many inconveniences in the use of the liquid crystal phase controller

In 2012, H.Takenaka et al. achieved high-coupling-efficiency inter-satellite optical communication by controlling the high-speed tilting mirror to alleviate the beam angle error caused by the atmospheric turbulence effect (H.Takenaka, M.Toyoshima, and Y.Takayama, "Experimental verification of fiber -couplingefficiencyforsatellite-to-groundatmosphericlaserdownlinks,"OpticsExpress20, 15301-15308(2012)), but due to the use of inclined mirrors, the structure of the system is more complex and the dynamic characteristics are poor

[0004] To sum up, there is currently no technology to adaptively realize synchronous coupling and collimated emission of laser beams, and the existing technologies have their own shortcomings in terms of control accuracy, dynamic range, system structure, etc.

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