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In order to further improve the communication efficiency and communication rate of space laser communication, we used Circle Polarization Phase Shift Keying (CPolS K) and Circle Polarization Differential Orthogonal Phase Shift Keying (CPolDQPS K) modulations to adapt to the demands of the rapid development of the current space laser communication. Using Optisystem simulation software, we compared communication efficiency of the space laser communication system using CPolS K and CPolDQPS K modulations to transmit a period of signal with s peed of 1.5 Gbit/s and transmission distance of 36000 km. The simulation results showed that: Due to the polarization characteristics of laser light's stability in the process of atmospheric transmission and CPolDQPS K's advantages, using CPolDQPS K modulation way, we got better transmission effects an d the effect of the signal transmission error was minimum, and at the same time the signal waveform was the closest to the original signal. Keyword-CPolSK; CPolDQPSK

Circle Polarization Phase Shift Keying Technology Research Based on Space Laser Communication System