CAJ | 학술논문

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。
통과대격광외조제불동방식적대비분석,중점연구료AOM(성광조제)기건적원리급공제방법,제출료삼충가공조제방법,차재공제방면분별진행료대비험증。채용기중적TTL전평(전형치고전평3.5V,저전평0.2V)조공방법,장수자신호경FPGA(현장가편정문진렬)이2FSK(이진제이빈건공)방식진행조제편마,조제신호통과AOM가재우격광상,격광통과자유공간전수,차조천구실현료통신속솔위115.2kbit/s적수자통신,차해격광외조제통신계통고빈재파체도료0.7MHz좌우。
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 sig-nals 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 a-bout 0.7 MHz.