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在自由空间光通信(FSO)中,通信端机所处的平台在各种随机干扰力下发生振动,使正常的通信光路发生偏移,对误码率(BER)产生影响。为了减小振动引起的误码率,提出通过控制接收端光斑形状和大小来抑制误码率,并给出利用像散来获得指定光斑的设计方法和实例。结果表明,在实际通信环境中,通过选取合适的光斑参量可以使振动引起的误码率达到最小,通过调节发射端光学天线参量可以获得指定的光斑参量。对于振动不对称的情况,接收端光斑应该选择为椭圆形。
In free space optical communication (FSO), the platform where the communication terminal is located vibrates under various random interference forces, which shifts the normal communication optical path and affects the bit error rate (BER). In order to reduce the bit error rate caused by vibration, it is proposed to suppress the bit error rate by controlling the spot shape and size of the receiving end. The design method and example of using the astigmatism to obtain the specified spot are given. The results show that the bit error rate caused by vibration can be minimized by choosing proper speckle parameters in real communication environment. Specified speckle parameters can be obtained by adjusting the optical antenna parameters of the transmitter. For vibration asymmetry, the receiver spot should be selected as oval.