Femtosecond Pulse Trains through Dual-Pumping of Optical Fibers: Role of Third-Order Dispersion

TL;DR

This paper investigates how third-order dispersion affects the generation of femtosecond pulse trains via dual-wavelength pumping in optical fibers, highlighting limitations and tunability in pulse compression and wavelength shifting.

Contribution

It introduces a numerical study showing the impact of third-order dispersion on pulse compression and wavelength tuning in dual-pumping fiber systems, enabling tunable ultrashort pulse trains.

Findings

Third-order dispersion limits the shortest achievable pulse width.

Intrapulse Raman scattering causes a red shift in output wavelength.

Positive third-order dispersion results in over 25% red-shift of solitons.

Abstract

Generation of high-repetition-rate, femtosecond, soliton pulse trains through dual-wavelength pumping of a dispersion-decreasing fiber is studied numerically. The achievable shortest pulse width is found to be limited by third-order dispersion that has a significant effect on the pulse-compression dynamics. The output wavelength is red shifted because of intrapulse Raman scattering and depends heavily on third-order dispersion, whose positive values lead to the most red shifted solitons (>25% of the input pump center wavelength). The proposed scheme allows the generation of ultrashort pulse trains at tunable high repetition rates with a wide range of output wavelengths and pulse durations through dispersion engineering. The resulting frequency combs extend over a wide bandwidth with a tunable spacing between the comb lines.