长波红外无线激光通信脉冲宽度调制实验研究
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摘要
为实现长波红外无线激光通信,建立了基于脉宽调制的长波红外无线激光通信系统模型,对系统性能进行了分析,给出了系统误码率的计算公式.搭建了实验系统,对CO_2激光器的平均输出光功率随占空比的变化情况进行了分析,对不同占空比条件下接收端对应的激光平均脉冲宽度以及脉冲宽度受噪声影响的随机变化情况进行了分析,得到了激光输出平均光功率、平均脉冲宽度与占空比之间的关系,以及脉宽的分布规律,并将实验结果与理论分析结果进行了对比,在此基础上得到了脉宽最佳判决门限和系统各类工作参数同误码率之间的关系.结果表明,基于CO_2激光器的脉冲宽度调制能够实现长波红外无线激光通信.
In order to realize a Long-wave Infrared(LWIR)optical wireless communication,a longwave infrared optical wireless communication system model based on pulse width modulation was estabished,the performance of this system was analyzed,and an expression of bit error rate was proposed.An experimental system was designed,the change of average output optical power of CO_2 laser was analyzed,the average of received laser pulse width and random variation of pulse width affected by the noise under different duty ratios were analyzed.The relationship between the average of output optical power and pulse width with duty ratio was obtained,and the distribution law of pulse width was also obtained,and then the experimental results and theory analysis results were compared,based on this,the optimal judgment threshold of pulse width and the relationship between system working parameters with(Bit Error Rate)BER were obtained.It is proved that a long-wave infrared optical wireless communication can be achieved based on CO_2 laser by the pulse width modulation.
In order to realize a Long-wave Infrared(LWIR)optical wireless communication,a longwave infrared optical wireless communication system model based on pulse width modulation was estabished,the performance of this system was analyzed,and an expression of bit error rate was proposed.An experimental system was designed,the change of average output optical power of CO_2 laser was analyzed,the average of received laser pulse width and random variation of pulse width affected by the noise under different duty ratios were analyzed.The relationship between the average of output optical power and pulse width with duty ratio was obtained,and the distribution law of pulse width was also obtained,and then the experimental results and theory analysis results were compared,based on this,the optimal judgment threshold of pulse width and the relationship between system working parameters with(Bit Error Rate)BER were obtained.It is proved that a long-wave infrared optical wireless communication can be achieved based on CO_2 laser by the pulse width modulation.
引文
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[2]ZHU Hong-tao,DAI Feng-yu,WANG Zhi-yong,et al.Research present situation of LWIR free-space laser communication technology[J].Optical Communication Technology,2011,35(8):68-71.朱宏韬,代丰羽,王志勇,等.长波红外无线激光通信技术研究现状[J].光通信技术.2011,35(8):68-71.
[3]WANG Zhe,WANG Jing-yuan,XU Zhi-yong,et al.Long wavelength infrared free-space optical communication technology[J].Journal of Military Communications Technology,2014,35(4):37-42.王喆,汪井源,徐智勇,等.远红外自由空间光通信技术[J].军事通信技术,2014,35(4):37-42.
[4]LIU Zhan-hong,LIAO Ren-bo,SUN Jian-feng,et al.Performance analysis of new hybrid pulse modulation scheme in optical wireless system[J].Acta Optica Sinca,2015,35(7):0706004.刘展宏,廖仁波,孙建锋,等.无线光通信新型组合脉冲调制性能分析[J].光学学报,2015,35(7):0706004.
[5]PETKOVIC M,DJORDJEVIC G,MILIC D,et al.BER analysis of im/dd fso system with apd receiver over gammagamma turbulence[J].Serbian Journal of Eletrical Engineering,2014,11(1):61-72.
[6]FAN Yang-yu,ROGER J.Comparison of pulse position modulation and pulse width modulation for application in optical communications[J].Optical Engineering,2007,46(6):065001.
[7]LI Fei,WU Yi,HOU Zai-hong.Analysis and experimental research on bit error rate for free-space optical communication systems through turbulent atmosphere[J].Acta Optica Sinca,2012,32(6):0606002.李菲,吴毅,侯再红.湍流大气光通信系统误码率分析与实验研究[J].光学学报,2012,32(6):0606002.
[8]ZHANG Yu-fa,SUN Xiao-quan.Analysis of uitrashort pulse waveform and broadening caused by atomspheric turbulence and dispersion[J].Semiconductor Optoelectronics,2015,36(2):267-270.张玉发,孙晓泉.超短脉冲大气传输展宽及脉冲波形分析[J].半导体光电,2015,36(2):267-270.
[9]WANG Jia,YU Xin.The research of pulse stretch in free-space optical communication[J].Optical Technique,2009,35(1):80-83.王佳,俞信.自由空间光通信中光脉冲展宽问题的研究[J].光学技术,2009,35(1):80-83.
[10]LU Hong-qiang,ZHAO Wei,XIE Xiao-ping.Analysis and comparison of pulse brodening caused by atmopheric turbulence and dispersion[J].Acta Armamentarii,2011,32(4):432-437.陆红强,赵卫,谢小平.大气湍流和色散导致脉冲展宽的分析比较[J].兵工学报,2011,32(4):432-437.
[11]YE Xiang-yang,WANG Sheng-lie,HE Yun-gui.Power controlling and the controller design for RF excited CO2lasers[J].Journal of Optoelectronics Laser,2011,12(2):151-153.叶向阳,汪盛烈,何云贵.射频激励CO2激光器功率控制及其控制器设计[J].光电子激光,2011,12(2):151-153.
[12]ZHU Hong-bing,HE Li-juan.A study on appropriate conditions in consistency test of normal distribution by single sample K-S check in SPSS[J].Journal of Capital Institute of Physical Education,2009,21(4):466-470.朱红兵,何丽娟.关于用SPSS中单样本K-S检验法进行正态分布等的一致性检验时适用条件的研究[J].首都体育学院学报,2009,21(4):466-470.
[13]ZHANG Tie-ying,WANG Hong-xing,ZHU Yin-bing,et al.Analyses for wireless optical system modulation caused by threshold[J].Journal of Projectiles,Rockets,Missiles and Guidance,2006,26(4):323-325.张铁英,王红星,朱银兵,等.判决门限对无线光通信调制方式差错率影响分析[J].弹箭与制导学报,2006,26(4):323-325.