Performance Analysis of Super DWDM with OADM and Modulation Formats

Abstract

Wavelength division multiplexing is an optical technology that employs transmission of multiple data signals over a single optical fiber. Nonlinearities of optical fiber lead to distortion and attenuation of optical signals, resulting in degradation of WDM systems. Common nonlinear optical effect in fibers is due to refractive index. In the first case we demonstrate Quality factor performance resulting from XPM effect for NRZ and RZ soliton transmitting formats at 10 Gb/s with channel spacing of 12.5 GHz. XPM is limiting factor when gain of EDFA is small. RZ soliton is better than NRZ at small distance of 200 km and at large distance of 3200 km. Core effective area is key parameter to get higher Quality factor. In second case, ring optical network has been demonstrated and analyzed at each node with bit rate of 2.5 Gbps, 5Gbps and 10 Gbps for different modulation formats like NRZ rectangular, NRZ raised cosine, RZ soliton, RZ super gaussian, RZ raised cosine and RZ rectangular. The distance between the nodes is set to 120km (SMF+DCF). Semiconductor optical amplifier after each node enhances the power level. The effect of insertion losses for a wide range of 40 dB to 100 dB is analyzed and it seen that RZsoliton is performing better among all modulation driving schemes. It is seen that by using RZ soliton format system can exist up to 95 dB of insertion loss. The effect of OADM bandwidth is also analyzed and it is seen that after 10 GHz bandwidth there is huge rise in the system performances for NRZ rectangular and RZ soliton In the last we investigate the performance of 256 channel WDM system with channel spacing of 25 GHz and 50 GHz with bit rate of 2.5 Gbps at different distances. We analyze the result at the receiving frequencies like 193.025 GHz, 193.225 GHz, 193.35GHz, 193GHz, 195.2GHz, 195.075GHz, 195.175GHz, 195.425 GHz. We see that performance of the system is better for 50 GHz spacing.