Abstract
Parametric amplifiers relying on the nonlinear four-wave mixing process are known for their signature symmetric gain spectrum, where signal and idler sidebands are generated on both sides of a powerful pump wave frequency. In this article we show analytically and numerically that parametric amplification in two identically coupled nonlinear waveguides can be designed in such a way that signals and idlers are naturally separated into two different supermodes, hence providing idler-free amplification for the supermode carrying signals. This phenomenon is based on the coupled-core fibers analogue of intermodal four wave-mixing occurring in a multimode fiber. The control parameter is the pump power asymmetry between the two waveguides, which leverages the frequency dependency of the coupling strength. Our findings pave the way for a novel class of parametric amplifiers and wavelength converters, based on coupled waveguides and dual-core fibers.
| Original language | English |
|---|---|
| Pages (from-to) | 9760-9768 |
| Number of pages | 9 |
| Journal | Optics Express |
| Volume | 31 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 13 Mar 2023 |
Bibliographical note
Funding: Engineering and Physical Sciences Research Council (EP/W002868/1); Royal Academy of Engineering (Research Fellowship Scheme).Copyright Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.