Investigation on the upgrade of existing 10Gbps Metro DWDM networks to 40Gbps based on measured PMD data of deployed fiber in Malaysia

We present analysis of different modulation formats using actual Polarization Mode Dispersion (PMD) data of deployed fiber links in the metro area in Kuala Lumpur, Malaysia. Simulations have been conducted for comparing the performance of Non-Return-to-Zero (NRZ), Return-to-Zero (RZ), Carrier-Suppressed Return-to-Zero (CSRZ), Phase Shaped Binary Transmission (PSBT) and Differential Quadrature Phase Shift Keying (DQPSK) modulation formats for possible future upgrade to 40Gbps from an existing 10Gbps DWDM system. The performance in terms of BER is presented to illustrate the limitations attributed to PMD based on current existing network configurations.