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Squeezing enhancement by suppression of noise through a resonant interferometric coupler

Alice Viola, Marco Liscidini

Published Jan 1, 2023• 0 citations
Publisher

Abstract

We present an integrated device in which a resonant interferometric coupler allows for the suppression of nonlinear parasitic processes and the efficient generation of squeezed light via spontaneous four-wave mixing.
DOI
10.1364/cleo_at.2023.jth2a.49

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We propose an integrated resonant structure to enhance squeezing by dual-pump spontaneous four-wave mixing (SFWM) while simultaneously suppressing parametric noise due to parasitic processes. The structure relies on a resonant interferometric coupler that allows one to engineer the field enhancement on-demand in the spectral region of interest. We analyze the different configurations in which the structure can operate, and we calculate the generated squeezing. We show that our device can overcome the intrinsic squeezing limit of a single-ring resonator.
We investigate the use of integrated structures for the efficient generation of squeezed light via dual-pump spontaneous four-wave mixing. We consider the case of ring resonators, in which resonant field enhancement is typically used to increase the efficiency of nonlinear interactions. We show that in these structures the presence of a comb of equally spaced resonances can also lead to the enhancement of parasitic processes that can degrade the quality of the generated light, thus limiting the achievable squeezing. Here, we discuss possible solutions to this issue and introduce a device consisting of a ring resonator and a resonant interferometric coupler able to control the field enhancement selectively. We show that through this structure one can strongly limit the effect of parasitic processes and overcome the intrinsic limitations of a single-ring resonator. Finally, we model the effect of nonlinear parasitic processes and provide an analytic expression of the achievable squeezing.
We propose an integrated device, the resonant interferometric coupler, enabling selective control over the coupling condition of a microring resonator. This can be used to tune the resonance linewidths independently, allowing for the targeted engineering of nonlinear optical interactions. We show how this can be applied to spontaneous four-wave mixing for various purposes. In the low-gain regime, we demonstrate the generation of spectrally uncorrelated photon pairs by broadening the pump resonance relative to the signal and idler. In the high-gain regime, we show how parasitic nonlinear processes can be suppressed by inhibiting undesired resonances, leading to a more efficient generation of squeezed light.