Adaptive optics for the free-space coherent optical communications
| Autor: | Mo Chen, Hao Xian, Chao Liu, Shanqiu Chen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
business.industry Optical communication Strehl ratio Near and far field 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Telescope Direct-conversion receiver Optics law 0103 physical sciences Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology business Adaptive optics Mixing (physics) Free-space optical communication |
| Zdroj: | Optics Communications. 361:21-24 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2015.10.033 |
| Popis: | We present the results that the performances of the atmospheric coherent optical communications improved by a real 127-element adaptive optics system operating in 1550 nm wavelength on a 1.8 m telescope. The mixing efficiency and the BER of the homodyne free-space optical coherent communications have been analyzed with the correction of the adaptive optics system. It is shown that, the AO can expand the scope of the atmospheric turbulence condition D/r(0)(1550) from 1 to around 6.5 in which the coherent optical communications can function well. In order to acquire favorable results, the mixing efficiency should be larger than 0.4 and the residual wavefront error after the AO correction should be smaller than lambda/6. We also find that the mixing efficiency of the coherent homodyne receiver is approximate to the Strehl ratio of the far field of the signal light. In conclusion, we have shown that the adaptive optics is a very promising technique that can largely improve the performances of the free space coherent optical communications degraded by the atmospheric turbulence. (C) 2015 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect