Evolution of TDM-PON to WDM-PON Using Downstream MSK and Remodulated Upstream ASK

Abstract

Here, a migration scheme from legacy Time Division Multiplexed Passive Optical Network to the next generation Wavelength Division Multiplexed Passive Optical Network is studied and analyzed with Minimum shift keying (MSK) modulation for WDM-PON downstream signal. Without changing the existing infrastructure of TDM-PON, WDM-PON is incorporated. The combined TDM and WDM downstream signals in central office (CO) are passed through a 30 km Single mode fiber (SMF) without dispersion compensation and detected at respective ONUs after separating wavelengths from each other. In WDM-PON, downstream signal is reused to modulate the upstream signal. Performance analysis of legacy TDM-PON and co-existing TDM-PON are compared on the basis of Bit Error Rate (BER) and eye diagrams.