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The fiber nonlinearities are one of the main performance limiting factors in any optical communication system. There are several parameters that effectively contribute in mitigation of these fiber nonlinearities such as fiber dispersion, effective area of fiber core, etc. Here, we have investigated the four wave mixing (FWM) nonlinear impairments in 16-channel WDM system. The FWM crosstalk becomes very critical to handle for long haul transmission systems at high power levels. Here, 16 channels WDM is being implemented and its performance is evaluated in terms of bit error rate (BER), Q factor, etc. for distance transmission upto 500 km. [ABSTRACT FROM AUTHOR]

A CO-OFDM system combines the advantages of both coherent detection and OFDM modulation for future high speed fiber transmission. In this paper, we propose an I/Q modulation technique using dual-drive MZMs for high rate 10 Gb/s CO-OFDM system. The proposed modulator provides 10.63 dBm improved optical spectra compared to a single dual-drive MZM. The simulation results in terms of BER and Q factor are quite satisfactory upto a transmission reach of 3,000 km and that to without making use of any dispersion compensation. A BER of about 8.03×10−10 and 15.06 dB Q factor have been achieved at −10.43 dBm received optical power. [ABSTRACT FROM AUTHOR]

This paper successfully demonstrate point-topoint (P2P) 2.5 TB/s DWDM system in downstream for 100 wavelengths having 0.4nm (50GHz) channel spacing by using post-dispersion compensation scheme. Each channel is transmitting 25GB/s data rate in down link. A 20km dispersion compensating fiber (DCF) followed by 80km standard single mode fiber (SSMF) which passes 20 times through fiber span for compensating the chromatic dispersion. The maximum reach of designed system is (100 × 20) 2,000km. In this paper we also performed the comparison of different modulation formats such as NRZ, RZ and CRZ. It has been observed that CRZ modulation format can achieve BER as better as e-9 for each channel, which gives best performance. The performance of designed system is compared in terms of Q-factor, eye diagrams and BER. [ABSTRACT FROM AUTHOR]