高频电光调制驱动器的设计

Design of high-frequency electro-opticalmodulator

要想实现两台独立激光器的相干合成,需要在得到相位差信号的基础上,利用相位差信号去实时控制LiN-bO3电光晶体,以此达到弥补相位跳变的目的。由于相位差信息是随机变化的,而且其幅值很小,不能直接驱动LiNbO3电光晶体,所以需要经过放大处理。利用前置放大器LMH6624和高压放大器PA98设计了一个高频电光调制器的驱动电路,将拍频信号中分离出来的相位差信号经过驱动电路放大后去控制LiNbO3电光晶体,以此改变通过电光晶体的光束的相位,为进一步实现相干合成打下基础。

In order to realize the coherent combining of two different lasers,the phase noise is needed to control the LiNbO3 crystal which is used to change the phase of the light.In normal case,the phase noise is so small that it can not drive the crystal LiNbO3,so using advantage of amplifiers LMH6624 and PA98 designs a amplification circuit which is used to get the voltage of the phase noise high enough to drive the crystal.In this way,the phase of the light through the crystal can be changed,and the success of phase control lays a foundation for the coherent combining.