Abstract
As a continuation of our previous work [Optics Express.25, 15229(2017)] in which we have verified the performance of a coherent free space optical communication (FSOC) system with a 97-element adaptive optics (AO) system, in this paper, we evaluated the performance improvement of the coherent FSOC system using a large-scale high-speed AO system with a 349-element continuous surface deformable mirror. The mixing efficiency (ME) and bit-error-rate (BER) under different Greenwood frequency (GF) were calculated as the performance metric of coherent FSOC system. The performance of FSOC system using such a large-scale AO system was quantitatively verified for the first time. The obtained results showed that the performance was obviously improved when a larger-scale high-speed AO system is employed in coherent FSOC system. This analysis result provides a performance verification for large-scale high-speed AO systems used in FSOC system which is beneficial for coherent FSOC system parameters design.
Highlights
As a continuation of our previous work [Optics Express.25, 15229(2017)] in which we have verified the performance of a coherent free space optical communication (FSOC) system with a 97-element adaptive optics (AO) system, in this paper, we evaluated the performance improvement of the coherent FSOC system using a large-scale high-speed AO system with a 349-element continuous surface deformable mirror
We described a large-scale high-speed AO system with a 349-element deformable mirror to analyze the performance improvement for coherent FSOC system
The performance improvement of coherent FSOC system using such a large scale AO system is quantitively verified by experimental results
Summary
As a continuation of our previous work [Optics Express.25, 15229(2017)] in which we have verified the performance of a coherent free space optical communication (FSOC) system with a 97-element adaptive optics (AO) system, in this paper, we evaluated the performance improvement of the coherent FSOC system using a large-scale high-speed AO system with a 349-element continuous surface deformable mirror. The obtained results showed that the performance was obviously improved when a larger-scale high-speed AO system is employed in coherent FSOC system. In a typical AO system, the inherent ability of AO system to correct high spatial and temporal frequency aberrations are determined by the element number of deformable mirror (DM) and the closed-loop control bandwidth (CLCB), which represent the spatial characteristic and the temporal characteristic of AO system respectively Different choices of these parameters will lead to different performance of the coherent FSOC system. As a continuation of our previous work[13,21], a higher speed AO system with a double-stage fast-steering-mirror (FSM) and a 349-element continuous surface deformable mirror (CSDM) was introduced in coherent FSOC system to compensate higher spatial and temporal frequency wavefront aberrations. An experimental system was designed to evaluate the improvement of the coherent FSOC system performance with a 349-element high-speed AO system. The conclusion of this paper can provide a guideline for the design of coherent FSOC system with similar configuration of AO system
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