LAUSR

Abstract We report a free space optical transmission system with low-noise wide-spectral carriers in a simulated turbulent channel with tunable turbulence intensity. The low-noise supercontinuum generation is achieved by using amplified diode-laser pulses to pump nonlinear fiber with the aid of amplified spontaneous emission seeding. Subsequent wide-spectral carriers are generated by filtering the low-noise SC with a coarse wavelength division demultiplexer. Transmission characteristics in turbulent channel, including power fluctuation, eye patterns, and bit error rate, between narrow-spectral, wide-spectral and low-noise wide-spectral carriers are compared respectively. It is experimentally verified that our methods can improve pulse-to-pulse fluctuation of wide-spectral carriers without weakening its ability of turbulence resistance, thus the transmission performance of low-noise wide-spectral carriers in turbulence channel is highly evaluated. It is feasible to apply the wide-spectral carriers transmission scheme to reduce influence of atmosphere turbulence and our further improvement make the scheme more adaptive to present FSO network.