Numerical and Experimental Demonstration of Intermodal Dispersive Wave Generation

Abstract

Evidence of intermodal dispersive wave generation mediated by intermodal cross-phase modulation (iXPM) between different transverse modes during supercontinuum generation in silicon nitride waveguides is presented. The formation of a higher-order soliton in one strong transverse mode leads to phase modulation of a second, weak transverse mode by iXPM. The phase modulation enables not only supercontinuum generation but also dispersive wave generation within the weak mode, that otherwise has insufficient power to facilitate dispersive wave formation. The nonlinear frequency conversion scheme presented here suggests phase-matching conditions beyond what is currently known, which can be exploited for extending the spectral bandwidth within supercontinuum generation.

Ultraefficient on‐Chip Supercontinuum Generation from Sign‐Alternating‐Dispersion Waveguides

“…However, the same spectral quality can be seen in the studies we compare to with large-enough bandwidth to display such dips, for example, other studies refs. [12,[27][28][29].…”

“…We tabulate the efficiency enhancement factor of our method in comparison to several state-of-the-art experimental results for SCG in the integrated silicon nitride platform, [12,13,[27][28][29][30][31][32] shown in Table 1 for both structure 1 (s-polarization input) and structure 2 (p-polarization input) around a central wavelength of 1550 nm. With regard to all of the compared works, the alternating SCG waveguides show a clear relative advantage for both polarizations and a maximum efficiency enhancement factor of η BP > 2700.…”

Spatially Controlled Phase Modulation - Selective Higher-Order Mode Excitation in 3D Nanoprinted on-Chip Hollow-Core Waveguides

“…Recently, higher-order modes (HOMs) in waveguides have attracted considerable attention in waveguide photonics because they exhibit dispersion and field distributions very different from their fundamental counterpart, relevant in topical applications such as quantum technologies (e.g., creation of entangled photon-pairs, use of high-dimensional quantum states), bioanalytics (e.g., detection of refractive index changes) or nonlinear photonics (e.g., intermodal dispersive wave generation). Particularly within Fiber Optics, HOMs have been widely used in various contexts, including tailored light sources (e.g., lasers or frequency shifter), complex beam generation and guidance (e.g., optical vortex formation), mode engineering (e.g., boosting mode areas) or ultrafast nonlinear photonics (e.g., supercontinuum generation).…”