A method for optimizing and designing high isolation level Cassegrainian optical antenna

摘要

In order to reduce the optical intensity of backscattering lights of the Cassegrainian optical antenna in the optical systemof the laser communication terminal and improve the optical isolation of laser communication system, this paperproposes a method for designing high isolation level Cassegrainian optical antenna by increasing the characteristic valueof the optical intensity of backscattering lights E/N. The method aims to improve the optical antenna isolation throughreducing the optical intensity of backscattering lights along the incident optical path based on analyzing the theoreticalmodel of the optical intensity of backscattering lights BRDF. A Cassegrainian optical antenna for laser communication isdesigned in this paper, and the method is used to optimize the isolation of this optical antenna by custom operands inZEMAX. Then using TracePro software builds the optical structure model of this optical antenna before and afteroptimization, simulate the optical intensity of backscattering lights of each model, calculate and analyze the isolation ofeach model by using simulation data respectively. It is show that the backscattering rate of the system decreases from0.0011956 to 0.00007515, and the isolation decreases from -29.224dB to -41.24dB. Optimization has improved theisolation 12.017dB of the optical system through use the method.