Comparative Study of 1-Tb/s Single Laser Coherent Optical Systems based on OFDM and Nyquist FDM

Two multiplexing techniques, digitally frequency multiplexed Nyquist FDM and OFDM, are evaluated in high-data rate coherent optical transmissions. Simulations are carried out to achieve a net data rate of 1 Tb/s through dual-polarization 64QAM and 256QAM at 100 GBd and 75 GBd, respectively. The systems’ performance were evaluated in terms of OSNR versus Tx and Rx laser linewidths, number of subcarriers, and DAC/ADC quantization and bandwidths. Despite similar performance for both techniques, CO-NFDM may allow a lower-cost implementation.

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