A novel differential optical modulator for the application of the spatial optic communication

In order to improve the anti-interference ability of spatial optic communication,a novel optic differential modulation device based on two-wave mixing was adopted.Experimental results proved that the common-mode noise caused by cloud cluster,fog,etc,could be eliminated effectively with the help of differential mode spatial optic communication.The quality of spatial optic communication can be markedly improved by taking differential method.