Impact of Deterministic and Random Jitter in a PDM-64QAM 64-GBd Coherent Transmission

We analyzed the performance of a 64QAM 64-Gbaud coherent transmission with respect to the random and deterministic jitter components. Simulations assumed a back-to-back transmission with noise loading, considering impairments such as transmitter and receiver lasers linewidths and bandwidths. We considered the effects of different root mean square (RMS) values of each jitter component separately and of linear combinations of both. In the separate scenario, similar results were observed for both components at low RMS values (≤ 3% of the symbol period). For higher values, the system is more impaired by the deterministic jitter. Additionally we verified a higher sensibility for jitter in analog-to-digital converters (ADCs) compared to digital-to-analog converters (DACs). At 6% of the symbol period, the difference in requried OSNR is as high as 0.8 dB in the DAC and 3 dB in the ADC. Results show that the RMS value of the jitter signal is not sufficient to estimate the performance degradation introduced by a device because the system bit error ratio also depends on the jitter distribution.