基于声光调制的激光通信调制系统研究  

Research on AOM-based modulation technology for laser communications

作　　者：徐山河 肖沙里[1] 王珊[1] 易星[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400030

出　　处：《光通信研究》2014年第5期59-62,共4页Study on Optical Communications

摘　　要：通过对激光外调制不同方式的对比分析,重点研究了AOM(声光调制)器件的原理及控制方法,提出了三种可控调制方法,且在控制方面分别进行了对比验证。采用其中的TTL电平(典型值高电平3.5V,低电平0.2V)调控方法,将数字信号经FPGA(现场可编程门阵列)以2FSK(二进制移频键控)方式进行调制编码,调制信号通过AOM加载于激光上,激光通过自由空间传输,借助串口实现了通信速率为115.2kbit/s的数字通信,且该激光外调制通信系统高频载波达到了0.7MHz左右。On basis of comparing and analyzing the different modes of laser external modulation, this paper focuses on the prin- ciple and control methods of Acousto-Optic Modulation （AOM） devices. Then it presents three controllable ones and compares and verifies them respectively. It adopts the TTL level （3.5 V/0.2 V） control method to modulate and encode the digital signals via FPGA by way of 2FSK and load the modulated signals on to laser light by AOM, which realizes 115.2 kbit/s digital communication after free space transmission and the carrier of this laser external modulation communication system reaches about 0.7 MHz.

关 键 词：声光调制 激光通信 现场可编程门阵列 移频键控 

分 类 号：TN249[电子电信—物理电子学]