摘要
无衍射光束的发散角为零并且中心光斑直径相对于高斯光束较小,在激光通信中有潜在的应用价值。本文介绍了一种以无衍射光束为信息载体的大气激光通信模拟实验系统。以串口作为计算机与该通信系统的连接终端,通信速率可通过控制软件调为多种级别。采用内调制的方法使得激光光强随传输数据而变化,使用圆锥透镜法将激光器的出射光束转换为无衍射光,在接收端利用PIN探测器将经过调制的光信号转换为电信号,经过解调后进行信号放大和电平转换,最后将数据输入串口。激光调制电路具有自动功率控制功能,维持通信过程中激光器的功率恒定。激光接收电路具有无光告警功能,可在光路受到遮挡时提示通信中断。经过实验,该系统可完成计算机串口之间的无衍射激光通信,通信比特率达到普通计算机串口的最大速率19.2kbps。
Non - diffracting beam＇s divergence angle is zero and has a smaller central spot than that of a Gaussiau beam, so it may bring potential application in laser communication. An atmospheric laser communication simulation experiment system using non - diffracting beam as the infunnation carrier was introduced. To connect with a computer the serial ports was used as the system temninals, and the communication rate can be changed for a variety of levels through the control software. The intensity of the laser beam changes with the transmission data by intensity modulation, and the laser beam was converted into non - diffracting beam using Axicon nrethod, and then on the receiver a PIN detector was adopted to transform the optical signal into the electrical signal. After den：odulation processing, amplification and electrical level conversion were done to put the data into the serial ports. The laser driver circuit with automatic power control function was designed to maintain the laser power invariable. The photoelectric deteetion circuit with the Loss - of- Signal Outputs function can warn when the optical path is blocked. Experiments showed that non - diffracting laser communication can be completed between computer serial ports, the system bit rate can reach the largest computer serial rate 19.2 kbps.
出处
《激光杂志》
CAS
CSCD
北大核心
2009年第2期59-61,共3页
Laser Journal
基金
航天科技创新基金资助项目(2006-2007)
关键词
大气激光通信
无衍射光束
串口
atmosoberic laser eommtmication
non- chffracting beana
serial port
