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.
All-optical gain-control Raman fiber amplifier (RFA) based on ring cavity technique using a pair of circulators is investigated experimentally. A pair of 1465nm laser diodes is used as the pump source to the RFA which provides a gain peak at around 1565 nm. The analyses of gain and noise figure are carried out using lasing wavelengths of 1550 and 1565 nm. Gain and noise figure variations are 0.4 and 0.5 dB respectively. We observed strong influence of pump-signal relative intensity noise transfer that results in noise figure penalty. The analyses are also carried out on hybrid configuration of RFA and EDFA and the characteristics of the dynamic range of the configurations are being compared.