弱湍流状态下空间光-多模光纤耦合效率分析
|
摘要
利用菲涅尔反射和模式耦合理论研究弱湍流条件下的多模光纤耦合效率模型。理论分析入射角起伏、光束漂移情况下多模光纤耦合效率模型,并通过模式匹配法对空间光-多模光纤耦合效率进行数值分析。理论计算表明:当光斑轴向偏差80μm,入射角为0.45mrad时菲涅尔损耗使多模光纤耦合效率下降到50%,各模式中基模耦合效率最高,随着大气结构常数增大各模式耦合效率明显下降。
Based on fresnel reflection and mode coupling theory,the coupling efficiency model of light from free space to multimode fiber is specifically derived.In this paper,the author theoretically analyzes the consequential influences to the multimode fiber coupling efficiency model when incident angle fluctuation and beam drift occur.Additionally,numerical analysis of coupling efficiency of light from free space to multimode fiber is carried out by employing mode matching method.The results from theoretical computation indicate that the coupling efficiency is dropped to 50% when axial alignment tolerance is 80μm and incident angle is 0.45 mrad,the fundamental mode coupling has the highest efficiency in comparison with high order mode,and the coupling efficiency declines dramatically with an increase in atmosphere structure constant.
Based on fresnel reflection and mode coupling theory,the coupling efficiency model of light from free space to multimode fiber is specifically derived.In this paper,the author theoretically analyzes the consequential influences to the multimode fiber coupling efficiency model when incident angle fluctuation and beam drift occur.Additionally,numerical analysis of coupling efficiency of light from free space to multimode fiber is carried out by employing mode matching method.The results from theoretical computation indicate that the coupling efficiency is dropped to 50% when axial alignment tolerance is 80μm and incident angle is 0.45 mrad,the fundamental mode coupling has the highest efficiency in comparison with high order mode,and the coupling efficiency declines dramatically with an increase in atmosphere structure constant.
引文
[1]Michael G T.Phase estimation methods for optical coherent detection using digital signal processing[J].IEEE Light Wave Technology,2009,27:901-914.
[2]Lee E J,Chan V W S.Diversity coherent and incoherent receivers for free-space optical communication in the presence and absence of interference[C]//IEEE Optical Communications and Networking,2009,5:463-483.
[3]许楠,刘立人,刘德安,等.自由空间相干光通信技术及发展[J].光通信,2007,44(8):44-51.Xu Nan,Liu Liren,Liu De’an,et al.Technologies and recent progress of coherent optical communications in free space[J].Laser&Optoelectronics Progress.2007,44(8):44-51.
[4]徐静,毛红敏,甄胜来等.大气湍流引起激光外差探测空间相干性退化研究[J].激光与红外,2007,37(12):1245-1249.Xu Jing,Mao Hongmin,Zhen Shenglai,et al.The research for the deterioration of spatial coherence of laser heterodyne detection caused by atmospheric turbulence[J].Laser&Infrared,2007,37(12):1245-1249.
[5]Holzman J F,Niu Mingbo,Cheng Julian.Diversity reception for coherent free-space optical communications over K-Distributed Atmospheric Turbulence Channels[C]//IEEE Wireless Communications and Networking Coference(WCNC),2010,3:1-6.
[6]杨利红,柯熙政,马冬冬,等.10.6μm激光在沙尘暴中的传输特性研究[J].西安理工大学学报,2009,25(4):472-476.Yang Lihong,Ke Xizheng,Ma Dongdong,et al.Research on 10.6μm laser transmission characteristics in dust storms[J].Journal of Xi’an University of Technology,2009,25(4):472-476.
[7]覃智祥.大气湍流对空间光—单模光纤耦合效率影响研究[D].哈尔滨工业大学,2010.Tan Zhixiang.The Research of the impact of atmospheric turbulence on space light-single mode fiber coupling efficiency[D].Harbin Institute of Technology,2010.
[8]陈海涛,杨华军,李拓辉等.光纤偏移对空间光-单模光纤耦合效率的影响[J].激光与红外,2011,41(01):75-78.Chen Haitao,Yang Huajun,Li Tuohui,et al.Influcence of fiber displacement on coupling light beam into single-mode fiber[J].Laser&Infrared,2011,41(01):75-78.
[9]王亚萍,胡辽林,张卫强.分布式光纤光栅传感系统中微弱信号检测研究[J].西安理工大学学报,2013,29(4):428-433.Wang Yaping,Hu Liaolin,Zhang Weichao.Research on weak signal detecting in distributed FBG sensing system[J].Journal of Xi’an University of Technology,2013,29(4):428-433.
[10]Lazzaroni M,Zocchi F E.Optical coupling from plane wave to step-index single-mode fiber[J].Optics Communications,2004,237(1-7):37-43.
[11]Erich L,Stefan S,Markus L.Using tapers for efficient coupling of received FSO-signals into fibers[C]//Conference Record of 13th International Conference on Transparent Optical Networks(ICTON),Stockholm,SWEDEN,2011:1-6.
[12]向劲松,陈彦,胡渝.大气湍流对空间光耦合至单模光纤的影响[J].强激光与粒子束,2006,18(3):377-380.Xiang Jingsong,Chen Yan,Hu Yu.Influcence of coupling free space light beam into single-mode fiber through atmospheric turbulence[J].High power laser and particle beams,2006,18(3):377-380.
[13]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):301-303.Han Liqiang,Wang Qi,Shida Katsunori,et al.Free space optical communication based on adaptive optics compensation[J].Journal of Applied Optics,2010,31(2):301-303.
[14]Larry C A,Ronald L P.Laser beam propagation through random media[M].The International Society for Optical Engineering(SPIE),2005.
[15]Ruilier C.A study of degraded light coupling into single-mode fibers[C]//Proceeding of the International Society for Optical Engineering(SPIE),Bellingham Washington,USA,1998:319-329.
[16]Shaklan S,Roddier F.Coupling starlight into singlemode fiber optics[J].Applied Optics,1988,27(11):2234-2238.
[2]Lee E J,Chan V W S.Diversity coherent and incoherent receivers for free-space optical communication in the presence and absence of interference[C]//IEEE Optical Communications and Networking,2009,5:463-483.
[3]许楠,刘立人,刘德安,等.自由空间相干光通信技术及发展[J].光通信,2007,44(8):44-51.Xu Nan,Liu Liren,Liu De’an,et al.Technologies and recent progress of coherent optical communications in free space[J].Laser&Optoelectronics Progress.2007,44(8):44-51.
[4]徐静,毛红敏,甄胜来等.大气湍流引起激光外差探测空间相干性退化研究[J].激光与红外,2007,37(12):1245-1249.Xu Jing,Mao Hongmin,Zhen Shenglai,et al.The research for the deterioration of spatial coherence of laser heterodyne detection caused by atmospheric turbulence[J].Laser&Infrared,2007,37(12):1245-1249.
[5]Holzman J F,Niu Mingbo,Cheng Julian.Diversity reception for coherent free-space optical communications over K-Distributed Atmospheric Turbulence Channels[C]//IEEE Wireless Communications and Networking Coference(WCNC),2010,3:1-6.
[6]杨利红,柯熙政,马冬冬,等.10.6μm激光在沙尘暴中的传输特性研究[J].西安理工大学学报,2009,25(4):472-476.Yang Lihong,Ke Xizheng,Ma Dongdong,et al.Research on 10.6μm laser transmission characteristics in dust storms[J].Journal of Xi’an University of Technology,2009,25(4):472-476.
[7]覃智祥.大气湍流对空间光—单模光纤耦合效率影响研究[D].哈尔滨工业大学,2010.Tan Zhixiang.The Research of the impact of atmospheric turbulence on space light-single mode fiber coupling efficiency[D].Harbin Institute of Technology,2010.
[8]陈海涛,杨华军,李拓辉等.光纤偏移对空间光-单模光纤耦合效率的影响[J].激光与红外,2011,41(01):75-78.Chen Haitao,Yang Huajun,Li Tuohui,et al.Influcence of fiber displacement on coupling light beam into single-mode fiber[J].Laser&Infrared,2011,41(01):75-78.
[9]王亚萍,胡辽林,张卫强.分布式光纤光栅传感系统中微弱信号检测研究[J].西安理工大学学报,2013,29(4):428-433.Wang Yaping,Hu Liaolin,Zhang Weichao.Research on weak signal detecting in distributed FBG sensing system[J].Journal of Xi’an University of Technology,2013,29(4):428-433.
[10]Lazzaroni M,Zocchi F E.Optical coupling from plane wave to step-index single-mode fiber[J].Optics Communications,2004,237(1-7):37-43.
[11]Erich L,Stefan S,Markus L.Using tapers for efficient coupling of received FSO-signals into fibers[C]//Conference Record of 13th International Conference on Transparent Optical Networks(ICTON),Stockholm,SWEDEN,2011:1-6.
[12]向劲松,陈彦,胡渝.大气湍流对空间光耦合至单模光纤的影响[J].强激光与粒子束,2006,18(3):377-380.Xiang Jingsong,Chen Yan,Hu Yu.Influcence of coupling free space light beam into single-mode fiber through atmospheric turbulence[J].High power laser and particle beams,2006,18(3):377-380.
[13]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):301-303.Han Liqiang,Wang Qi,Shida Katsunori,et al.Free space optical communication based on adaptive optics compensation[J].Journal of Applied Optics,2010,31(2):301-303.
[14]Larry C A,Ronald L P.Laser beam propagation through random media[M].The International Society for Optical Engineering(SPIE),2005.
[15]Ruilier C.A study of degraded light coupling into single-mode fibers[C]//Proceeding of the International Society for Optical Engineering(SPIE),Bellingham Washington,USA,1998:319-329.
[16]Shaklan S,Roddier F.Coupling starlight into singlemode fiber optics[J].Applied Optics,1988,27(11):2234-2238.