Coherent detection system and method for homologous common beam of laser
A detection system and detection method technology, applied in the field of coherent optical communication, can solve problems such as high frequency stability requirements of lasers, increased difficulty of coaxial adjustment, complex optical path structure, etc., to achieve enhanced selection, improved receiving sensitivity, and optical path composition simple effect
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[0024] see image 3 , The present invention is a coherent detection system of laser coherent beam, which is mainly composed of a laser, a spot homogenization device, an acousto-optic modulator, an optical lens, a beam collimator and a photoelectric detector. The laser is connected to one of the input ends of the acousto-optic modulator through the light spot homogenizing device, and the externally input radio frequency electrical signal is connected to the other input end of the acousto-optic modulator. The output end of the acousto-optic modulator is opposite to the incident surface of the optical lens, and the outgoing surface of the optical lens is opposite to the input end of the beam collimator. The output end of the beam collimator is connected with the photodetector.
[0025] Since the laser line width and power stability have a great influence on the performance of coherent detection, the narrow line width light source has higher frequency accuracy, which is beneficia...
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