Abstract
In this research paper, we have compared the performance of various conventional amplifiers such as erbium-doped fiber amplifier (EDFA), semiconductor optical amplifier (SOA) and RAMAN amplifier used in an ultra-dense wavelength division multiplexing (UD-WDM) system, for 400 channels at a narrow channel spacing of 25 GHz and a bit rate of 100 Gb/s per channel, based on the high spectral efficient dual-polarized quadrature-phase-shift keying (DP-QPSK) modulation technique. The performance is compared in terms of quality factor (Q-factor), bit error rate (BER) and received output power with respect to varying fiber lengths from 50 to 400 km and applied input powers. From the simulation results, it is reported that the RAMAN amplifier gives better performance in all the above-mentioned parameters. The maximum Q-factor of 13.5 dB, minimum BER of around 10–10 and received output power of -34 dBm is reported for a fiber length from 50 to 400 km for RAMAN amplifier which is better than all the other amplifiers. Furthermore, the maximum Q-factor of 11 dB and minimum BER of around 10–13 are reported when measured with the applied input power.
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