Numerical Simulation of Mid-Infrared Optical Frequency Comb Generation in Chalcogenide As2S3 Microbubble Resonators

Abstract

Mid-infrared optical frequency comb generation in whispering gallery mode microresonators attracts significant interest. Chalcogenide glass microresonators are good candidates for operating in the mid-infrared range. We present the first theoretical analysis of optical frequency comb generation in As2S3 microbubble resonators in the 3–4 μm range. The regime of dissipative soliton plus dispersive wave generation is simulated numerically in the frame of the Lugiato–Lefever equation. Using microbubble geometry allows controlling of the zero-dispersion wavelength and the obtaining of anomalous dispersion needed for soliton generation at the pump wavelength of 3.5 μm, whereas the zero-dispersion wavelength of the analyzed As2S3 glass is ~4.8 μm. It is shown that, for the optimized characteristics of microbubble resonators, optical frequency combs with a spectral width of more than 700 nm (at the level of −30 dB) can be obtained with the low pump power of 10 mW.

Kerr-Raman Optical Frequency Combs in Silica Microsphere Pumped Near Zero Dispersion Wavelength

“…The nonlinear Kerr coefficients found for different radii are plotted in Figure 2(b). The nonlinear dynamics of an intracavity field leading to OFC generation was simulated numerically in the framework of the LLE [6,32] as in [28,33] using home-made software based on the Split-step Fourier method. We used the master equation in the following form [6,29,34]:…”

ADVANCED PROGRESS ON Χ<SUP>(3)</SUP> NONLINEARITY IN CHIP-SCALE PHOTONIC PLATFORMS (INVITED REVIEW)

“…Although the microcombs generated are multi-soliton state, the dual-comb spectroscopy could still acquire spectra of acetone at 127 GHz (4.2 cm −1 ) resolution. They further demonstrated high-throughput label-free MIR dual-comb [135]. The spectral range of the Kerr microcombs could span more than 700 nm.…”

The Effect of Input Pulse on the Soliton Generation in Microresonators

“…Solitons possess highly attractive features for practical implementation beyond controlled environments due to their compacted dimensions and minimal requirements of energy. It was shown that the equilibrium between the cavity losses, cavity gain, group velocity dispersion (GVD), and Kerr nonlinearity can be maintained to create low-noise, coherent, broad-frequency combs in microresonators [4,10].…”