Abstract
Abstract This paper presents the comparison of various modulation formats for 64×10 Gbps dense wavelength division multiplexing system using Raman–erbium-doped fiber amplifier optical amplifier with 100 GHz interval. We evaluate the suitability of various data formats like return-to-zero (RZ) raised cosine (RC), RZ rectangular (Rect), non-return-to-zero (NRZ) RC and NRZ-Rect for an optical transmission link. The results have been carried out by evaluating the value of quality factor, bit error rate (BER) and average opening of an eye. It is found that using NRZ-Rect data format, the signal can travel up to transmission length of 234 km with acceptable BER (1.10e−09) and Q-factor (15.57 dB), respectively. In addition, the effect of dispersion on various data formats has also been discussed. Further, we investigate the optical RZ pulse with variable duty cycle indicating the highest quality factor and optical output power for duty cycle 0.6 observed for the case of back-to-back system.
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