外差探测系统波前校正实验研究
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摘要
湍流效应是限制相干光通信系统性能最重要的影响因素。使用夏克-哈特曼波前传感器、变形镜和波前控制器组成自由空间相干光通信波前校正系统,对光波经过大气湍流后的畸变波前进行实时校正,其大气湍流是用基于修正Hill谱生成的不同强度随机相位屏模拟的。实验结果表明,波前校正系统实现闭环后的波前误差峰谷值(PV)小于0.8μm,均方根值(RMS)小于0.05μm,斯特列尔比(SR)大于0.8。若将以上波前校正系统应用到相干光通信系统中可使误码率可以降低到10~(-12)数量级,提高了系统的通信性能。这将为自由空间光外差探测系统搭建实际链路提供了可靠数据参考。
The turbulence effect is the most significant factor which influences the performance of a coherent optical communication system. In this paper, the wavefront correction system of free-space coherent optical communication are comprised of SH-WFS, DM, and the wavefront controller. The distorted wavefront of the beam after passing through the atmosphere is corrected real-time, which the atmospheric turbulence is simulated with different intensity phase screens based on modified Hill spectrum. Experimental results show that the PV of the wavefront correction system with the closed loop is less than 0.8 μm, the RMS is less than 0.05 μm, and the SR is larger than 0.8. If the proposed wavefront correction system is applied to the coherent optical communication system, the bit error rate can be reduced to the 10~(-12), which improves the communication performance of the system. This will provide a reliable data reference for the free-space optical heterodyne detection system to build the practical communication link.
The turbulence effect is the most significant factor which influences the performance of a coherent optical communication system. In this paper, the wavefront correction system of free-space coherent optical communication are comprised of SH-WFS, DM, and the wavefront controller. The distorted wavefront of the beam after passing through the atmosphere is corrected real-time, which the atmospheric turbulence is simulated with different intensity phase screens based on modified Hill spectrum. Experimental results show that the PV of the wavefront correction system with the closed loop is less than 0.8 μm, the RMS is less than 0.05 μm, and the SR is larger than 0.8. If the proposed wavefront correction system is applied to the coherent optical communication system, the bit error rate can be reduced to the 10~(-12), which improves the communication performance of the system. This will provide a reliable data reference for the free-space optical heterodyne detection system to build the practical communication link.
引文
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[14] LIU C, CHEN S Q, LI X Y, et al. Performance evaluation of adaptive optics for atmospheric coherent laser communications [J]. Optics Express, 2014, 22(13): 15554-15563.
[15] 杨慧珍,李新阳.基于Zernike模式的自适应光学系统随机并行梯度下降算法[J].强激光与粒子束,2009, 21(5),645- 648.YANG H ZH, LI X Y. Stochastic parallel gradient descent algorithm for adaptive optics system based on Zernike mode [J]. High Power Laser and Particle Beams, 2009, 21(5): 645- 648.
[16] 韩立强,王祁,信太克归,等. 基于自适应光学补偿的自由空间光通信系统性能研究[J].应用光学,2010,31(2):301-304.HAN L Q, WANG Q, XINTAI K G,et al. Free space optical communication based on adaptive optics compensation [J]. Journal of Applied Optics, 2010, 31(2): 301-304.
[17] 王智宏,陈琛,千承辉,等.基于粒子群寻优的光谱仪波长误差修正方法[J].仪器仪表学报,2017,38(10):2430- 2436.WANG ZH H, CHEN CH, QIAN CH H, et al. Spectrometer wavelength error correction method based on particle swarm optimization [J]. Chinese Journal of Scientific Instrument, 2017, 38(10): 2430- 2436.
[18] 张慧敏,李新阳.大气湍流畸变相位屏的数值模拟方法研究[J].光电工程,2006,33(1):14-19.ZHANG H M, LI X Y. Numerical simulation of wavefront phase screen distorted by atmospheric turbulence [J]. Opto-Electronic Engineering, 2006,33(1): 14-19.
[19] ANDREWS L C,PHILLIPS R L. Laser beam propagation through random media[M]. Washington: SPIE,2005:67-71.
[20] XIA A L, MA C W. An improved centroid detection method based on higher moment for Shack-Hartmann wave front sensor [C]. Proceedings of SPIE, 2010: 78501.
[21] CAO J T, ZHAO X H, LI Z K, et al. Stochastic parallel gradient descent laser beam control algorithm for atmospheric compensation in free space optical communication [J]. Optik, 2014, 125(20): 2142- 2147.
[2] TYSON R.K. Principles of adaptive optics [M]. Newyork: CRC Press, 2011.
[3] FENG F, WHITE IAN H, WILKINSON T D. Aberration correction for free space optical communications using rectangular Zernike modal wavefront sensing [J]. Journal of Lightwave Technology, 2014, 32(6): 1239-1245.
[4] 普湛清,王巍,张扬帆,等. UUV平台OFDM水声通信时变多普勒跟踪与补偿算法[J]. 仪器仪表学报,2017,38(7):1634-1644.PU ZH Q, WANG W, ZHANG Y F, et al. Time variant doppler tracking and compensation in underwater acoustic OFDM communication for UUV platform[J].Chinese Journal of Scientific Instrument, 2017, 38(7): 1634-1644.
[5] 王瑾,袁占军,张金博.基于无线通信技术的调频发射接收系统设计[J].国外电子测量技术,2017, 36(11):89-93.WANG J, YUAN ZH J, ZHANG J B. Design of frequency modulation transmitting and receiving system based on wireless communication technology [J]. Foreign Electronic Measurement Technology, 2017, 36(11): 89-93.
[6] 刘世涛,曹阳,彭小峰,等.空间激光通信的视轴初始指向系统研究[J].电子测量与仪器学报,2017,31(5):658- 662.LIU SH T, CAO Y, PENG X F, et al. Research on line of sight initial alignment system in space laser communication [J]. Journal of Electronic Measurement and Instrumentation, 2017, 31(5): 658- 662.
[7] BERKEFELD T, SOLTAU D, SODNIK Z, et al. Adaptive optics for satellite-to-ground laser communication at the 1m telescope of the ESA optical ground station [C]. Proceedings of SPIE,2010, 7736(10):146.
[8] LIU C, CHEN M, CHEN S Q, et al. Adaptive optics for the free space coherent optical communications [J]. Optics Communications, 2016(361): 21- 24.
[9] 孔英秀,柯熙政,杨媛.激光器线宽对空间相干光通信系统性能的影响[J]. 仪器仪表学报,2017, 38(7): 1668-1674.KONG Y X, KE X ZH, YANG Y. Influence of laser linewidth on the performance of space coherent optical communication system [J]. Chinese Journal of Scientific Instrument, 2017, 38(7): 1668-1674.
[10] 王盟盟,董瑞芳,项晓,等.基于外差检测原理的绝对测距性能理论研究[J]. 仪器仪表学报,2016,37(8):1861-1868.WANG M M, DONG R F, XIANG X,et al. Theoretical research for absolute distance measurement based on heterodyne detection principle [J]. Chinese Journal of Scientific Instrument, 2016, 37(8): 1861-1868
[11] 曾玲,陈伟,陶金.低信噪比正弦信号相位差测量算法对比研究[J].电子测量技术,2017,40(1):71- 89.ZENG L, CHEN W, TAO J. Comparative study of the phase difference measurement algorithms for low signal to noise ratio sine signal [J]. Electronic Measurement Technology, 2017, 40(1): 71- 89.
[12] LI Z K, ZHAO X H, CAO J T, et al. Model-based tabu search algorithm for free space optical communication with a novel parallel wavefront correction system [J]. Journal of the Optical Society of Korea, 2015, 19(1): 45- 54.
[13] LI Z K, CAO J T, ZHAO X H, et al. Combinational deformable mirror adaptive optics system for atmospheric compensation in free space communication [J]. Optical Communications, 2014(320): 162-168.
[14] LIU C, CHEN S Q, LI X Y, et al. Performance evaluation of adaptive optics for atmospheric coherent laser communications [J]. Optics Express, 2014, 22(13): 15554-15563.
[15] 杨慧珍,李新阳.基于Zernike模式的自适应光学系统随机并行梯度下降算法[J].强激光与粒子束,2009, 21(5),645- 648.YANG H ZH, LI X Y. Stochastic parallel gradient descent algorithm for adaptive optics system based on Zernike mode [J]. High Power Laser and Particle Beams, 2009, 21(5): 645- 648.
[16] 韩立强,王祁,信太克归,等. 基于自适应光学补偿的自由空间光通信系统性能研究[J].应用光学,2010,31(2):301-304.HAN L Q, WANG Q, XINTAI K G,et al. Free space optical communication based on adaptive optics compensation [J]. Journal of Applied Optics, 2010, 31(2): 301-304.
[17] 王智宏,陈琛,千承辉,等.基于粒子群寻优的光谱仪波长误差修正方法[J].仪器仪表学报,2017,38(10):2430- 2436.WANG ZH H, CHEN CH, QIAN CH H, et al. Spectrometer wavelength error correction method based on particle swarm optimization [J]. Chinese Journal of Scientific Instrument, 2017, 38(10): 2430- 2436.
[18] 张慧敏,李新阳.大气湍流畸变相位屏的数值模拟方法研究[J].光电工程,2006,33(1):14-19.ZHANG H M, LI X Y. Numerical simulation of wavefront phase screen distorted by atmospheric turbulence [J]. Opto-Electronic Engineering, 2006,33(1): 14-19.
[19] ANDREWS L C,PHILLIPS R L. Laser beam propagation through random media[M]. Washington: SPIE,2005:67-71.
[20] XIA A L, MA C W. An improved centroid detection method based on higher moment for Shack-Hartmann wave front sensor [C]. Proceedings of SPIE, 2010: 78501.
[21] CAO J T, ZHAO X H, LI Z K, et al. Stochastic parallel gradient descent laser beam control algorithm for atmospheric compensation in free space optical communication [J]. Optik, 2014, 125(20): 2142- 2147.