Dual Octaves Multichannel Waveguides Squeezed Light Generation

This paper investigates the squeezing properties and harmonic generation in a two-octave nonlinear waveguide system composed of channels exhibiting a second-order nonlinear effect. The channel converts an input frequency at the first harmonic to the second and subsequently to the fourth harmonic. The system equation is solved semi-analytically by using the normal ordered phase space representation. The results show consistent first harmonic squeezing across channels, while second and fourth harmonic squeezing vary significantly, with the center channels showing higher efficiency. As the harmonic generation progresses from the first harmonic to the fourth harmonic, the magnitude of squeezing typically decreases. These findings may provide valuable findings for enhancing higher-order harmonic generation and squeezing in nonlinear waveguide systems.