In this article a numerical simulation is carried out on a single channel optical transmission system with channel bit rate greater than 40 Gb/s to investigate optical signal degradation due to the impact of dispersion and dispersion slope of both transmitting and dispersion compensating fibers. By independently varying the input signal power and the dispersion slope of both transmitting and dispersion compensating fibers of an optical link utilizing a channel bit rate of 86 Gb/s, a good quality factor (Q factor) is obtained with a dispersion slope compensation ratio change of ±10% for a faithful transmission. With this ratio change a minimum Q factor of 16 dB is obtained in the presence of amplifier noise figure of 5 dB and fiber nonlinearities effects at input signal power of 5 dBm and 3 spans of 100 km standard single mode fiber with a dispersion (D) value of 17 ps/nm.km.
The received optical signal quality of 40 Gb/s data rate direct-detection transmission system can be substantially improved by a system composed mainly with optical devices at the end of the last span of the transmission link. The system is mainly composed of a spectral inversion module (optical phase conjugation) followed by a high nonlinear fiber (HNLF) at the receiver end. The simulation and experimental results demonstrate effective signal waveform distortion compensation in a 40 Gb/s long-haul single channel intensity and phase modulated optical transmission systems.
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