Abstract
We modeled and analyzed a method to improve the performance of Absolute Polar Duty Cycle Division Multiplexing (AP-DCDM) over Wavelength Division Multiplexing (WDM) system by using Dual-Drive Mach-Zehnder-Modulator (DD-MZM). It is found that by optimizing the bias voltage in DD-MZM, the receiver sensitivity of 1.28 Tbit/s (32 x 40 Gbit/s) AP-DCDM-WDM over 320 km fiber can be improved. The optimizations leads towards stabilization of timing jitter and, subsequently, result in larger eye opening. In comparison to the previously reported AP-DCDM-WDM system, almost 4.1 dB improvement of receiver sensitivity is achieved.