Recently, the Chinese Academy of Sciences Institute of Optics and Optoelectronics Key Laboratory of Adaptive Optical Li Xinyang, Geng superconductivity group made new progress in the study of coherent polarization synthesis: optical fiber devices based on the synthesis of coherent polarization, phase control and polarization control methods Achieve efficient fiber coherent polarization synthesis. The technology is based on a fully-preserved polarization-maintaining fiber optic device that does not need to account for the effects of spatial errors and has high system stability, reliability, and ease of combination with other fiber optic devices and has great potential in phased array optical communication systems Value. Relevant results with Yang Yan as the first author were published in the recent Applied Optics and IEEE Photonics Technology Letters.

In order to mitigate the influence of atmospheric turbulence on coherent optical communications, two technical methods are currently used, namely "large aperture telescope + single aperture adaptive optics" and "phased array technology." Compared with the first kind of technology, the phased array technology has the advantages of small telescope size, low cost and high reliability. In phased array-based spatially coherent optical communication systems, the receive beam is split into multiple beams by the receive array. Therefore, it is very important how to efficiently synthesize a plurality of sub-beams carrying communication signals to a laser beam. In response to this problem, the research group proposed a coherent polarization synthesis technology based on optical fiber devices. The two linearly polarized light beams whose polarization states are perpendicular to each other can be combined into one beam by using a fiber polarization beam combiner. Due to the variation of the phase difference of the input beam, the synthesized beam is in any polarization state (Fig. In order to control the synthesized light beam to be linearly polarized light for next-stage synthesis or for demodulation of communication signals, the subject group separately proposed two methods of phase control (Fig. B) and polarization control (Fig. C) Theoretical analysis and experimental verification. The results show that both methods can achieve efficient coherent polarization synthesis, the multi-beam linearly polarized light efficiently synthesized into a polarization-maintaining fiber, and output linearly polarized light.

The work has received the support of the National Natural Science Foundation, the Chinese Academy of Sciences Innovation Fund and the Western Light and other projects.

Coherent Polarization Synthesis Schematic (a) Open Loop (b) Phase Control Closed Loop (c) Polarization Control Closed Loop

PBC is a fiber polarization beam combiner, PC is a fiber optic phase compensator, and DPC is a polarization controller

Polarization Control Based 3 - Coherent Polarization Synthesis Experiment Results

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