Laser communication links between satellite and ground remains a bottleneck problem that has not been solved in free
space communication network now. Atmospheric disturbances have badly influenced the wave-front of signal light and
destroyed the integrality of optical phase, so the bit error rate (BER) is increased at the receiving terminal in the
space-to-ground laser communication. With conventional coherent reception, the contrast of coherent light increased
dramatically, and transmission efficiency of Space to ground laser communication decreased. Receiving technology
based on differential phase shift keying (DPSK) is proposed here to overcome the effects of atmosphere here.
Differential phase shift keying without the integrality and compensation of the optical phases, is suited for high rate
space to ground communication links due to its immunity of the wavefront of a beam passing atmosphere. A
Mach-Zehnder delay interferometer is used for differential delay which is equal to the one bit period. The differential
data information can be obtained from the optical phase changes. Differential phase modulation technique can be a
promising optical receiving technology.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaoping Ma ; Jianfeng Sun ; Yanan Zhi and Liren Liu
Technological research of differential phase shift keying receiver in the satellite-to-ground laser communication
", Proc. SPIE 8517, Laser Communication and Propagation through the Atmosphere and Oceans, 851714 (October 24, 2012); doi:10.1117/12.928392; http://dx.doi.org/10.1117/12.928392