Equal-amplitude optical comb generation using multi-frequency phase modulation in optical fibers

We theoretically analyze and experimentally demonstrate a method of generating equal-amplitude optical comb exploiting multi-frequency phase modulation The theoretical analysis shows that. 4n-1. equal-amplitude spectral lines can be obtained when the modulation signal comprises n frequency components including the fundamental frequency and the odd harmonic frequencies, and 2n+1 equal-amplitude spectral lmes can be obtained when the modulation signal comprises a frequency components including the fundamental frequency and the even harmonic frequencies Then, we numerically simulate the spectra of 5, 7, 9, and 11 equal-amplitude spectral lines, respectively, which are also obtained in experiments with frequency separation of 30 MHz and flatness of better than 0 3 dB