基于现场可编程门阵列和大功率LED阵列光源的小型化水下无线光通信系统的研究与实现  

Research and Implementation of Miniaturized Underwater Wireless Optical Communication System Based on Field Programmable Gate Array and High-Power LED Array Light Source

作　　者：黄安 殷洪玺[1] 季秀阳 梁彦军 文浩 王建英 沈众卫 Huang An;Yin Hongxi;Ji Xiuyang;Liang Yanjun;Wen Hao;Wang Jianying;Shen Zhongwei(School of Information and Communication Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学信息与通信工程学院,辽宁大连116024

出　　处：《光学学报》2024年第6期218-228,共11页Acta Optica Sinica

基　　金：国家自然科学基金(61871418)。

摘　　要：针对水下无线通信高速率、远距离、低成本和小型化设备的实用需求,本文设计研制了一种高鲁棒性的基于现场可编程门阵列(FPGA)和大功率LED阵列的小型化水下无线光通信系统。其光发射机的光源采用45 W大功率LED阵列,基于FPGA实现高阶调制与编码,并设计了准直光学发射天线有效减少光束发散角,大幅度延长了传输距离。在光接收端,设计了一种基于3 mm大孔径雪崩光电二极管(APD)的自动增益控制放大和FPGA解调与信号处理的光接收机,降低了光通信系统对准的严苛要求。该系统可实现30 Mbps开关键控(OOK)信号和正交幅度调制(QAM)信号(16QAM信号)的12 m水下信道实时传输,二者的误码率(BER)分别为2.467×10^(-4)和3.467×10^(-3)。此外,该系统还实现了22 Mbps的非归零(NRZ)-OOK整形信号12 m水下+30 m空气的跨介质传输(总长度为42 m),BER为3.619×10^(-4)。最后,实现了12 m水下信道中接收机偏离主光轴40°之内22 Mbps OOK信号的有效接收,提高了系统的鲁棒性。Objective Underwater wireless optical communication(UWOC)featuring high speed,low delay,and high confidentiality can form a medium and short distance local area network(LAN)with high speed and strong real-time properties or can complement the advantages of underwater acoustic communication hybrid networking.It has become a research hotspot in recent years.The deployment and application of UWOC require high-performance,low-cost,and miniaturized practical optical transceivers.By employing a laser diode as a light source,the transmission distance is long with high speed,but the alignment of the light receiver and light sender is demanding,which is difficult for communication of non-fixed positions and orientations in the dynamic seawater environment.If the light-emitting diode(LED)is the light source,the alignment requirements can be greatly reduced,while the LED array can be adopted to enhance the light signals to extend the transmission distance.Meanwhile,the high-order modulation can be utilized to improve the problem of insufficient bandwidths.The existing UWOC systems based on LED design have a large room for improvement in transmission distance and transmission rate.Additionally,the system design can realize real-time high-order modulation,coding and signal processing,and miniaturized system integration by leveraging field programmable gate array(FPGA)at both receiving and transmitting ends,and further improve the system performance and practicality.Aiming at the application requirements of underwater UWOC with high speed,long distance,low cost,and miniaturization,we design a highly robust integrated miniaturized UWOC system based on high-power LED array and FPGA.The system can realize on-off keying(OOK)modulation,and flexibly realize high-order modulation and channel coding.Meanwhile,it can achieve a longer transmission distance and a higher transmission rate than the LED UWOC systems reported in previous references,with miniaturized integration of optical receivers and transmitters.Methods The optical transm

关 键 词：水下无线光通信 现场可编程门阵列 LED阵列 高阶调制 小型化光端机 

分 类 号：TN929.1[电子电信—通信与信息系统] TN929.3[电子电信—信息与通信工程]