How to protect the optical antenna simply and effectively is an important problem that should be resolved for the laser warning equipment to be used in adverse field conditions.

To overcome the atmospheric attenuation effect,the non-line-of-sight scattering atmospheric optical communication system usually adopt an optical antenna to enhance the signal collection ability and increase its communication distance.

On the basis of analysis of and research on the current laser spectrum detection technology, the paper proposed the protocol that, use fiber optical antenna and modified wedge interferometer to obtain the laser interference fringe, t.