利用超连续谱激光实现自由空间光通信

Free space optical communication based on supercontinuum laser source

超连续谱光源具有丰富的带宽,是信号载体的优秀候选者。设计并搭建了利用超连续谱光源的空间无线光通信系统,讨论了超连续谱产生的条件以及输出光斑直径不同位置下的光谱。采用了电光调制方式对超连续谱光源进行调制,通过比较输入与输出的数字方波信号证明了电光调制进行超连续谱空间光通信的可行性。成功利用该系统演示了对原始图像信号的采集和显示,最后通过对接收端信号的整形放大恢复出了原始信号,实现了图像信号在4 m范围内的传输。实验结果表明:将超连续谱作为光信号载体,在空间大气信道条件下可以实现对图像信号进行无线传输。

Supercontinuum laser source is an excellent candidate as signal carrier because of its wealth of bandwidth. Free space optical communication system based on supercontinuum laser source was designed and established. The conditions of supercontinuum generation and the out spectrum at different locations of laser beam spot were discussed. The supercontinuum laser source was modulated by electro-optic modulator. And the feasibility of free space optical communication based on supercontinuum laser source which used electro-optic modulator was proved by comparing the input and output of digital square wave signals. Besides, the image signals collection and display were successfully demonstrated. Finally, the original signals were recovered by the shaping amplificaton of receiving end signals, the image signals transmission in the range of 4 m was successfully realized. According to the experiments mentioned above, supercontinuum laser source under the condition of the free space can realize transmission of wireless video signals.