Performance Analysis of a CPDM-QPSK Direct Detection Optical Transmission System under the effects of Cross-Polarization

Analysis is developed for a Circular Polarization Division Multiplexing Quadrature Phase Shift Keying (CPDM-QPSK) with direct detection optical transmission system considering the impact of the crosstalk(Xtalk) owing to cross-polarization(XPol) induced crosstalk by arbitrary misalignment of the SOPs. A thorough analysis is demonstrated to acquire the output expression of the Signal to Cross-talk plus Noise Ratio (SCNR) for a direct detection CPDM-QPSK receiver. Considering the Maxwellian distribution of the random misalignment angles, the outcome of Bit Error Rate (BER) performance is presented ultimately. Moreover, cross-polarization affects the BER performances and thus the system suffers a significant deterioration from the expected results. It can also be observed that, the system suffers power penalty of 0.18, 0.92 and 4.44 dB for misalignment angle of 10, 11 and 12 degrees respectively at BER of 10
^-9
.