Sub-Poissonian Light in a Waveguide Kerr-medium

TL;DR

This paper explores the potential of silicon nitride waveguides for generating sub-Poissonian light through Kerr nonlinearities, providing analytical formulas and numerical results showing significant photon noise suppression at practical power levels.

Contribution

It introduces new analytical formulas to estimate photon noise suppression in Kerr states within waveguides and demonstrates their effectiveness through numerical calculations.

Findings

Photon noise suppression can reach 5-15 dB.

Sub-Poissonian light generation is feasible with 100 mW power.

Waveguides of a few meters can achieve significant noise reduction.

Abstract

Waveguides on a chip represent a new medium for implementing nonlinear optical transformations of light. Modern $\text{Si}_3\text{N}_4$ chip waveguides are attractive due to their high Kerr nonlinearity, suppressed Brillouin scattering on guided acoustic waves (GAWBS), and lengths up to one meter. The capabilities of waveguides for generating sub-Poissonian light in the form of a displaced Kerr state are analyzed. We offer new analytical formulas for estimating the capabilities of suppressing photon fluctuations of a displaced Kerr state for any value of input light amplitude. The results of numerical calculations are presented. It is shown that the degree of photon noise suppression can reach values of 5 - 15 dB with 100 mW light power in waveguides a few meters long.