Implementation of Highly Loss Budget NG-PON Incorporating the Direct Modulation and Advance Pulse Formats

Abstract

This paper presents the different modulation formats Return to zero (RZ), Non-return to zero (NRZ) and differential phase shift key (DPSK) and these formats have been investigated in wavelength division multiplexing passive optical network (WDM-PON) at 40Km. It has been observed that DPSK performs better at long range than return to zero (RZ) and non-return to zero (NRZ) techniques. It is further investigated that with increase of link length, value of quality (Q) -factor decreases and there is increase in the bit error rate (BER). System performance studied at different input powers and it is observed that system performance increase with increase in power but after some value results tend to decrease due to nonlinearities Self phase modulation (SPM), Four wave mixing (FWM), Cross phase modulation (XPM) comes into play.