Research on optical interferometric communication frequency characteristic test and matching method

摘要

The paper proposes a laser light source and component frequency characteristic test and match design scheme based on space laser communication of optical interferometric heterodyne detection. The scheme utilizes dual phase-shifted fiber gratings to modulate frequency when the interferometric light of different frequency pass photoconductive photodetector weeny light heterodyne frequency switch highly electronic frequency and proceed to frequency response test and matching. We can proceed to match design of total system optical frequency characteristic according as component frequency characteristic matching adjustment. Compared with conventional scheme that the variety of regulable optical cavity length obtains beat frequency signal in the photoconductive photodetector , the scheme can proceed to exceed broad band frequency response characteristic test to photoconductive photodetector and total communication system without additional calibrate light source and the scheme possess quantitative control and narrow line breadth of laser signal less polarization so that highly precision of test and distinguishability . The scheme significantly improves antijamming performance of optical communication system and advances a novel method in the test and matching design of optical communication laser frequency characteristic.