Evaluation shows improved bit error rate in high-capacity wavelength division multiplexing using f-OFDM and optical frequency comb, indicating potential for scalable networks.
This paper proposes and evaluates performance enhancement of a high-capacity wavelength division multiplexing (WDM) system integrating flattened optical frequency comb generator used as a multi-carrier generator source (MCS) with filtered orthogonal frequency division multiplexing (f-OFDM) modulation, a two stages comb source employing two electro-absorption (EA) modulators, phase (PM) and amplitude (AM) modulators, respectively achieving 120 comb lines with ≤1 dB spectral flatness spaced by 25 GHz that serve as optically subcarriers. a data rate of 480 Gbps is achieved using a set of eight lines selected to transmit 60 Gbps per line, while the system scalability to achieve up to 7.2 Tbit/s using all 120 comb lines. Numerical results are carried out using OptiSystem software. The result shows the impact of different launch power levels and fiber transmission distances without employing dispersion compensation or optical amplification on the bit error rate (BER) performance beyond which nonlinear effects degrade the system. Results confirms the possibility of employing flattened optical comb sources with f-OFDM modulation for high-capacity and adaptable optical networks.
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Mohammed et al. (2025) studied this question.
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