Optical Transmission Schemes for Focal-plane Data
焦平面数据的光传输方案设计

To solve the problem that ordinary electrical wires used in dewar can easily lead to the increase of temperature, the optical transmission methods for transmitting the data from a focal plane to the outside of the dewar are studied according to the operation requirements of low temperature, low power consumption, high speed and small volume for cooled focal planes. The application of spatial light modulation and laser transmission methods in optical transmission are discussed, the corresponding schemes are designed and their advantages and shortcomings are pointed out. The experimental results have shown that the spatial light modulation method has the features of high speed and parallel transmission with a data transfer rate of up to 24Gbps, but its structure design is more complicated and higher power consumption is required. The laser transmission is a serial transmission with a data transfer rate of up to 2Gbps. It needs only a power consumption of 100mW and its structure is small and simple. So, the laser transmission method is a more practical data transfer method for cooled focal planes.