Multi-octave mid-infrared supercontinuum and frequency comb generation in a suspended As₂Se₃ ridge waveguide

Abstract

In this paper, we numerically investigate the mid-infrared supercontinuum (SC) generation in a suspended As2Se3 ridge waveguide, which is designed with the two zero-dispersion wavelengths. Simulation results show that when the pump pulses at wavelength 3.3 µm with width of 100 fs and peak power of 900 W are launched into the anomalous dispersion region of the designed waveguide with a length of 0.87 mm, the SC can be generated in the wavelength range from 1.76 to 14.42 µm (more than 3 octaves), extending deep into the "fingerprint" region. The stability of the generated SC is confirmed by the first-order coherence. Moreover, we demonstrate the performance of the SC-based frequency comb by assuming a 50-pulses pump source at a repetition rate of 100 MHz.

Dispersion-engineered T-type germanium waveguide for mid-infrared supercontinuum and frequency comb generations in all-normal dispersion region

“…From the previous works [20][21][22][23][24][25], the dispersion has a crucial influence on the SC generation. When the pump pulse propagates in the anomalous dispersion region of the waveguide, the soliton dynamics dominate the nonlinear process of the SC generation [20][21][22].…”

“…From the previous works [20][21][22][23][24][25], the dispersion has a crucial influence on the SC generation. When the pump pulse propagates in the anomalous dispersion region of the waveguide, the soliton dynamics dominate the nonlinear process of the SC generation [20][21][22]. Although the bandwidth of the generated SC can usually be up to the multiple octaves, the coherence of the SC can be greatly degraded by the noise amplification induced by modulation instability.…”

Polarization-insensitive reverse-ridge AlGaAs waveguide for the mid-infrared supercontinuum generation

“…Mid-infrared supercontinuum (SC) generation is of great interest for its applications in spectroscopy [1][2][3][4][5], optical coherence tomography [6][7][8], biomedical imaging [9], ladar [10,11], gas sensing [12][13][14], etc. As well known, the interaction of dispersive and nonlinear effects, which includes self-phase modulation (SPM), cross-phase modulation (XPM), fourwave mixing (FWM), stimulated Raman scattering (SRS), soliton fission (SF), contributes to the SC generation [15][16][17][18].…”

Highly coherent and multi-octave mid-infrared supercontinuum generations in a reverse-strip AlGaAs waveguide with three zero-dispersion wavelengths

“…The bandwidth and coherence are the two key parameters for evaluating the SC performance. From the previous works, the dispersion characteristic of the optical waveguide has an important effect on the bandwidth and coherence of the generated SC [21][22][23][24][25][26][27][28][29][30]. The dispersion tailoring can be achieved through choosing the waveguide materials, designing the waveguide structure, and adjusting the waveguide geometry parameters [31][32][33][34][35][36][37][38].…”