Study on the bandwidth broadening of optical parametric amplifier based on conventional dispersion-shifted fiber

In order to broaden the amplification bandwidth of conventional dispersion-shifted fiber(DSF) double-pumped fiber optical parametric amplifier(FOPA),a cascade configuration with periodic dispersion compensation composed of conventional DSF and single-mode fiber(SMF) was proposed.Utilizing the configuration,the phase-mismatch caused by the negative fourth-order dispersion of DSF can be reduced by the positive second-order dispersion of SMF,thus the amplification bandwidth can be broadened efficiently.Utilizing the four-wave-mixing coupling equations,the double FOPA was studied.Through simulation,a 69nm bandwidth after broadening was obtained.The results show,for a fixed DSF fiber length,using the optimal SMF length to compensate the dispersion,the phase-mismatch induced by the fourth-order dispersion of DSF can be efficiently reduced and the amplification bandwidth can be broadened.It further shows that a larger bandwidth can be obtained by using multi-segment compensation.