Performance Analysis of Single- and Multiple- Eigenvalue based NFDM Optical Communication Systems with Discrete Spectrum Modulation

In nonlinear frequency division multiplexing (NFDM) transmission system with discrete spectrum (DS) modulation, there are two methods to improve the data transmission rate, including the increase of the baud rate, and the number of multiplexed eigenvalues. Although some studies have been made on the DS-NFDM, the characteristic of these two manners have not been analyzed yet. Here, we give some analysis on the DS-NFDM system to improve the performances, including the spectral efficiency, noise robustness and bit-error-rate (BER) under the same data transmission rate. The simulation results show that the single-eigenvalue high baud rate scheme has advantages in spectral efficiency, but it is inferior to the multi-eigenvalue low baud rate one in terms of noise robustness and BER performance.