Experimental observation of breathing solitons and a third harmonic in a tapered photonic crystal fiber

Abstract

We report the experimental observation of breathing solitons and a third harmonic in a tapered fluorotellurite photonic crystal fiber (PCF) pumped by a 1560 nm femtosecond fiber laser. The PCF has a core diameter that varies continuously along its length, resulting in a zerodispersion wavelength that moves from 1325 nm to 906 nm over the transition region. By finely controlling the dispersion map of the tapered PCF and increasing the order of the optical solitons, their breathing behavior is observed in the frequency domain and the number of breaths goes up to 9. Furthermore, the breathing behavior of the optical soliton is transferred to the third harmonic through inter-modal phase-matched processes in the tapered PCF, and the third harmonic also breathes with an increase in the pump power.

Supercontinuum generation in photonic crystal fibers infiltrated with nitrobenzene

“…SF occurs at around 0.5 cm and is accompanied by the creation of Raman solitons. At the same time, soliton breathing [41,42] leads to sudden spectral broadening and generates new wavelength components up to 3500 nm (across the ZWD) at the leading edge and around 1000 nm at the trailing edge. If the pulses have sufficient peak power the new wavelengths generated by soliton breathing create a dispersive wave.…”

Numerical investigation of a real-time temperature sensor based on high-order soliton compression

“…where A was the complex field envelope, α was the propagation loss, β m was the Taylor expansion coefficient of the GVD at the pump wavelength, γ was the nonlinear coefficient at the pump wavelength. To guarantee the accuracy of numerical simulations, a 4th-order Runge-Kutta algorithm was used in the calculation, and 2 18 time and frequency discretization points as well as a longitudinal step size < 5 µm were used in our simulations.…”

“…High-order soliton compression, as a nonlinear optical process, occurs in the initial stage of supercontinuum (SC) generation [17,18]. As the pulse is injected into a fiber, the initial stage of propagation is dominated by approximately symmetrical spectral broadening.…”