Simultaneous Measurement of Atmospheric Turbulence Induced Intensity and Polarization Fluctuation for Free Space Optical Communication

Performance estimation of polarization multiplexed DPSK signal transmission over temporally correlated free space optical channel

“…The PDM systems are susceptible to fluctuations in the state of polarization (SOP) and thus require polarization matching at both the transmitting and receiving ends [21] and affected by atmospheric turbulence, the amplitudes of the two orthogonally polarized lights experience different losses, leading to a change in the SOP [20]. J. Zhang et al have studied the random fluctuations in the polarization angle of the light beam in turbulent media [21].…”

“…J. Zhang et al have studied the random fluctuations in the polarization angle of the light beam in turbulent media [21]. It is found that polarization fluctuation depends on the index of the refraction structure parameter, and the distribution of a received polarization angle is Gaussian in nature [20], [21]. For the PDM signal, the polarization rotation effect can be estimated by the amplitude received after PBS.…”

“…So, there is a need to study the PDM-DPSK system over a slow varying FSO channel. As the PDM-DPSK transmission performance gets affected by polarization, phase, and intensity fluctuation, it is needed to take into account the variations of these parameters as well.The strength of the polarization and phase fluctuations are also the function of (C 2 n ) value, so we can consider these fluctuations also time-dependent and varying slowly, similar to the turbulence channel states [12], [20], [21]. Thus for a Gbps rate FSO system, the turbulent channel coefficients remain constant for a block of bits [18] and a proper channel model needs to be implemented for estimating the performance of the PDM-DPSK system.…”