高功率无线光通信波长转换系统性能研究  

Research on wavelength conversion system performance of high-power wireless optical communication

作　　者：杨祎 樊礼榕 王晓波 贺锋涛 段作梁 闵展望 Yang Yi;Fan Lirong;Wang Xiaobo;He Fengtao;Duan Zuoliang;Min Zhanwang(School of Electronic Engineering,Xi'an University of Posts&Telecommunications,Xi'an 710121,China;Xi'an Institute of Precision Machinery,Xi'an 710077,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]西安精密机械研究所,陕西西安710077

出　　处：《红外与激光工程》2023年第9期235-244,共10页Infrared and Laser Engineering

基　　金：陕西省微波光子与光通信创新团队基金项目(2021TD-09)。

摘　　要：针对水下高速无线激光通信发射功率较低,通信距离受限的问题,该研究采用非线性光学中二次谐波理论,将1064 nm的高速外调制与放大技术和非线性晶体的准相位匹配技术相结合,通过光学设计和系统参数研究,设计了一种532 nm的高速大功率无线激光调制发射系统,并建立了基于温度和角度变换的波长转换效率模型。然后通过仿真分析的方法得到了不同温度下,最大转换效率对应的角度范围。最后对系统的性能进行了系统搭建和实验分析,验证了该系统在常温下可实现1 W大功率532 nm绿光无线输出,且频率大于1 GHz的模拟信号和速率大于500 Mbps的数字信号调制。实验结果表明:常温下,该系统输出的光斑光强分布均匀,光束质量显著好于调制后的基频光模式。系统输出的方波信号上升沿宽度和下降沿宽度会发生压缩,但随着脉冲宽度的减小压缩现象会发生收敛,上升沿宽度收敛于0.27,下降沿宽度收敛于0.06,系统输出的正弦信号随着频率的增加没有发生明显的畸变。研究结果可以为未来水下长距离高速无线光通信应用提供理论和技术支撑。Objective With the increase of marine rights protection,marine resource development,and underwater exploration activities,wireless optical communication has become one of the key technologies for non-contact underwater information transmission due to its advantages of high speed,easy mobility,and good concealment.The absorption,scattering,and turbulence characteristics of visible light in seawater seriously restrict the underwater transmission distance of visible light communication systems.According to the transmission characteristics of visible light in seawater,blue-green light with the range of 450-550 nm is suitable for deep-sea wireless optical communication,which is less affected by seawater.In order to improve the capacity of wireless optical communication,high-order modulation methods such as Quadrature Amplitude Modulation(QAM)are often used in wireless optical communication systems.However,QAM modulation technology requires a linear light source and channel,which limits the emission power of the light source and reduces the underwater transmission distance for underwater wireless optical communication systems.In addition,it is difficult to quickly modulate a high-power laser light sources,so the high-power laser light cannot achieve high-speed optical carrier information transmission.Therefore,the wireless optical communication system with high-speed and high-power is one of the key technologies for long-distance underwater wireless optical communication.In order to obtain high-power signal light,Free Space Optical(FSO)communication usually uses optical amplifiers to directly amplify the signal light by combining the indirect modulation technology to output high-power signal light.However,it is difficult to directly amplify the blue-green light signal to achieve high-power underwater laser output in the UOWC system due to the lack of optical amplifiers in the blue-green light.Methods A high-power and high-speed underwater optical wireless communication(UOWC)system(Fig.1)with wavelength conversion const

关 键 词：水下无线光通信 波长转换系统性能 准相位匹配 非线性晶体 

分 类 号：TN929.1[电子电信—通信与信息系统]