In this study, a full duplex of 16-channel wavelength division multiplexing passive optical network (WDM-PON) architecture is designed and investigated using a centralized light source (CLS). A 20-Gb/s downstream bit rate is achieved without using a digital signal processing (DSP) unit or active elements. A carefully designed Mach-Zehnder modulator (MZM) operates as a pulse carver to refine single channel spectrum is utilized at each optical line terminal (OLT). More channels, a maximum bit error rate (BER) of 10 −13 and at least quality factor (Q-factor) of 7.0 are achieved. An on off keying (OOK) format of 5-Gbit/s is used for the upstream transmission. This is done with low complexity and a transmission distance of 25 km.

In this paper, an ultra-short (0.95 ps) pedestal free pulse source is optimized for ultrahigh data rate optical time-division-multiplexing (OTDM) systems. This source is based on a dispersion-compensation stage using a single-mode fiber (SMF) followed by a simple fiber-based pulse compression stage (using comblike dispersion profiled fiber (CDPF) and a self-phase modulation (SPM) based reshaping stage. A stable operation, with a high extinction ratio of 81 dB and a remarkable timing jitter of 72 fs are successfully achieved. Source tunability is available over the wavelength range 1546-1561 nm with a high quality pulse shape of 0.475 time bandwidth product. A noteworthy behavior of multiplexing from 10 to 320 Gb/s is observed. A comparison between this work and related literature is carried out showing an appreciable improvement.