Free space optical communication system based on wide-spectrum partially coherent laser

The impact of atmospheric turbulence on free space optical communication systems is not negligible. To reduce the influences of atmospheric turbulence on free space systems, a free space optical communication system based on wide-spectrum partially coherent laser in 900 m real atmospheric channel was experimentally demonstrated. The system used a modulated wide-spectrum partial coherence pulsed laser which was filtered from a supercontinuum to communicate, and the supercontinuum was gained by pumping picosecond pulses into a high-nonlinear fiber. In the process of testing, a reference link was set to ensure consistency of the testing environment. The results show that compared to the narrow linewidth communication system, under mid-turbulence condition, the system scintillation index is 0.053 8 which has 23% improvement and the system lowest detection sensitivity is -23.35 dBm which has 42% improvement.The wide-spectrum partially coherent optic communication system can significantly reduce the optical power jitter caused by turbulence and improve the communication performance of free-space optical communication systems.