空间光-多模光纤的单模耦合效率分析
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摘要
在空间光前置放大和外差探测应用中,单模光纤耦合是空间光通信的关键技术之一。由于多模光纤在短距离内可以实现近似单模传输,在特定条件下采用多模光纤作为耦合光纤,可兼顾单模和多模应用,提高光耦合效率。利用多层相位屏和光束传输法研究多模光纤中的传输特性。采用模式匹配法计算多模光纤耦合光场与基模光场耦合效率η。仿真结果表明:大气湍流强度参数D/r0=1、5、10时,η随多模光纤长度呈周期变化,峰值可以达到单模光纤直接耦合值的2～3.5倍;控制多模光纤的传输距离,可以获得最大值η,使多模光纤适用于相干光通信等单模应用中。
Single-mode fiber coupling is one of the key technologies in space optical communication for preamplifier and heterodyne detection. Multimode fiber can realize approximately single-mode transmission in a short distance. Under certain conditions,multi-mode fiber is used as coupling fiber, which can take into account both single-mode and multi-mode applications, improves the efficiency of optical coupling. The transmission characteristics of multimode fiber are studied by using multi-phase screen and beam propagation method. The mode coupling method is used to calculate the coupling efficiency between the coupled light field and the mode field of the multimode fiber. The mode matching method is used to calculate the matching efficiency η between the multimode fiber coupled light field and the fundamental mode field. The simulation results show that the η varies periodically with the length of the multimode fiber when the atmospheric turbulence intensity parameter D r0=1,5,10, and its peak value can reach 2～3.5 times the peak value of direct single-mode fiber coupling efficiency. When controlling the transmission distance of multimode fiber, the maximum value can be obtained, so that multimode fiber can be applied to single mode applications such as coherent optical communication.
Single-mode fiber coupling is one of the key technologies in space optical communication for preamplifier and heterodyne detection. Multimode fiber can realize approximately single-mode transmission in a short distance. Under certain conditions,multi-mode fiber is used as coupling fiber, which can take into account both single-mode and multi-mode applications, improves the efficiency of optical coupling. The transmission characteristics of multimode fiber are studied by using multi-phase screen and beam propagation method. The mode coupling method is used to calculate the coupling efficiency between the coupled light field and the mode field of the multimode fiber. The mode matching method is used to calculate the matching efficiency η between the multimode fiber coupled light field and the fundamental mode field. The simulation results show that the η varies periodically with the length of the multimode fiber when the atmospheric turbulence intensity parameter D r0=1,5,10, and its peak value can reach 2～3.5 times the peak value of direct single-mode fiber coupling efficiency. When controlling the transmission distance of multimode fiber, the maximum value can be obtained, so that multimode fiber can be applied to single mode applications such as coherent optical communication.
引文
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[13]武云云,陈二虎,张宇,等.自适应光学在光通信中的仿真与实验分析[J].光通信技术,2012,36(8):52-55.
[14] FREHLICH R. Simulation of laser propagation in a turbulent atmosphere[J]. Applied Optics, 2000, 39(3):393-397.
[15]艾勇,段梦云,徐洁洁,等. LC-SLM激光大气传输湍流模拟及通信实验分析[J].红外与激光工程,2015,44(10):3103-3109.
[16] WEN Xiang, XU Ke, SONG Qinghai. Design of a barcode-like waveguide nanostructure for efficient chip-fiber coupling[J]. Photonics Research,2016, 4(6):209-213.
[2]张慧颖,孙浩.前置放大的空间光DPSK自相干接收系统分析[J].光通信技术,2018,42(5):50-53.
[3]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.
[4]陈锦妮,柯熙政.弱湍流状态下空间光-多模光纤耦合效率分析[J].西安理工大学学报,2014(3):326-330.
[5] WINZER P J, LEEB W R. Fiber coupling efficiency for random light and its applications to lidar[J]. Optics letters, 1998, 23(13):986-988.
[6] DIKMELIK Y, DAVIDSON F M. Fiber-coupling efficiency for freespace optical communication through atmospheric turbulence[J]. 2005, 44(23):4946-4952.
[7] TAKENAKA H, TOYOSHIMA M, TAKAYAMA Y. Experimental verification of fiber-coupling efficiency for satellite-to-ground atmospheric laser downlinks[J]. Optics Express, 2012, 20(14):15301-15308.
[8]范雪冰,王超,佟首峰,等.空间光到单模多芯光纤耦合效率分析及影响因素研究[J].兵工学报,2017,38(12):2414-2422.
[9]马烈.大气湍流对空间光至单模光纤耦合效率概率分布影响研究[D].哈尔滨:哈尔滨工业大学,2015.
[10] BELMONTE A, KHAN J. Performance of synchronous optical receivers using atmospheric compensation techniques[J]. Optics Express,2008, 16(18):14151-14162.
[11]李佳蔚,陈卫标.星地相干光通信中的自适应光学系统带宽研究[J].中国激光,2016,43(8):248-253.
[12]熊准,艾勇,单欣,等.空间光通信光纤耦合效率及补偿分析[J].红外与激光工程,2013,42(9):2510-2514.
[13]武云云,陈二虎,张宇,等.自适应光学在光通信中的仿真与实验分析[J].光通信技术,2012,36(8):52-55.
[14] FREHLICH R. Simulation of laser propagation in a turbulent atmosphere[J]. Applied Optics, 2000, 39(3):393-397.
[15]艾勇,段梦云,徐洁洁,等. LC-SLM激光大气传输湍流模拟及通信实验分析[J].红外与激光工程,2015,44(10):3103-3109.
[16] WEN Xiang, XU Ke, SONG Qinghai. Design of a barcode-like waveguide nanostructure for efficient chip-fiber coupling[J]. Photonics Research,2016, 4(6):209-213.