Thermal Management And Anti-Radiation Characteristics Of Spatial Optics Serial-Parallel Conversion Module

Space laser communication technology compared with microwave communication technology with the advantages of high speed, small volume, strong confidentiality and small divergence Angle is the key to solve problem of communication rate. Space laser communication affected by bad weather can be interrupted, microwave communication need to be started to realize the real-time information transmission from satellites to the earth. However, the single channel transmission rate of Microwave communication from satellites to earth is very limited, even if the transmission rate of information is only 1.5 Gbps in ka-band. High-speed laser communication needs slow-down procession so that messages can be sent to the ground through the microwave communication. Therefore, the problem of transmission capacity mismatching between space laser communication and microwave communication needs to be solved urgently. In order to solve the problem efficiently, we can use serial-parallel conversion module to transform the high-speed serial optical signal to multipath low-speed parallel optical signal firstly, and then processing. The heat dissipation of serial-parallel conversion module which is a payload of satellite heavily affects the performance in vacuum working environment, so the thermal management in spatial optical serial-parallel conversion module becomes significant.For heat dissipation problem of serial-parallel conversion module, we analysis some high fever devices:power supply, FPGA, amplifiers, laser and optical modules in serial-parallel conversion module using ANSYS software in this paper. Then thermal analysis of the upper structure of module can benefit thermal analysis of serial-parallel conversion module. In order to improve thermal management performance, we choose copper heat conducting plate with higher thermal conductivity to maintenance the temperature within working range in system running process, making the system weight within limits simultaneously. When the temperature of constant temperature plate is 15?, the rise temperature of overall structures controls in 10 ?, working in space normally.At the same time, we choose laser to do irradiation experiments considering the anti-radiation ability of optical serial-parallel conversion module. Test the change of laser performance under different total irradiate dose.