摘要
为了实现自由空间高速激光通信,对基于偏振移位键控的激光通信调制和解调技术进行了研究。介绍了一种基于PolSK的调制与差分解调方法,对实现大气信道中高速激光通信的调制与解调方法进行了研究,并通过理论推导及计算机仿真验证了其可行性。仿真研究结果表明:虽然大气信道对激光的传输特性有一定的影响,但利用以左右旋圆偏振光调制为基础的偏振态移位键控方法实现数据调制传输,并采用差分探测解调技术,可以实现传输速率为2.5 Gb/s、传输距离为20 km的低误码率数据传输。基本满足了空间激光通信系统的稳定可靠性、简便易实现、抗干扰能力强等要求。
In order to achieve the high-speed FSO communication, the technology of modulation and demodulation on polarization shift keying （PolSK） was studied. A modulation and differential demodulation method based on PolSK was introduced and the method of modulation and demodulation in high speed laser communications through atmosphere channel was studied, and its feasibility by theoretical analysis and computer simulation was validated. The simulation result shows that although the atmospheric channel may affect the laser transmission characteristics, data transmission and modulation based on right/left circle polarization technology using differential detection demodulation technology, can transmit for 20 km at the speed of 2.5 Gb/s with a low BER. It meets the basic requirement of space laser communication system which is stability and reliability, simple and easy realization, and anti-interference ability.
出处
《红外与激光工程》
EI
CSCD
北大核心
2012年第10期2712-2717,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(60677009)
关键词
偏振移位键控
激光通信
偏振态
调制
polarization shift keying （PolSK）
laser communication
polarization
modulation
