A Cost-effective and Spectrally-efficient Design of Centralized Light Source WDM-PON using Aggregated 160 Gbit/s DQPSK Modulation forDownstream and Re-modulated IRZ for Upstream Transmission

Abstract

We propose and demonstrate a cost-effective and spectrally-efficient design of centralized light source wavelength division multiplexed passive optical network (WDM-PON). A 10 Gbit/s differential quadrature phase shift keying (DQPSK) data signal is used at optical line terminal (OLT) in the central office (CO) for downstream without pulse carving, whereas a 2.5 Gbit/s inverse return-to-zero (IRZ) data signal is used for upstream signal by re-modulation of downstream signal, no additional laser is used at optical network unit (ONU). Simulation results show that aggregated transmission of 160 Gbit/s downstream of 16 DQPSK channels and aggregated 40Gbit/s upstream of 16 IRZ channels, using spectrally-efficient 50 GHz channel spacing, can be successfully achieved over a distance of 20 km with lower transmission power penalties and improved receiver sensitivity in both downstream as well as upstream transmission.