Cascading is the process by which the exchange of energy between optical beams
interacting via second order nonlinearities (χ (2)) leads to various effects such as nonlinear …

In 1961, shortly after reliable laser sources were available, the experimental observation of
frequency doubling [second harmonic generation (SHG)] of red light was reported by …

The performance of three different asymmetric dual core nonlinear directional couplers
which includes an increasing and a decreasing self-phase modulation profile (SPM) was …

Optical couplers employing evanescent waves play an important role in optics,
optoelectronics and photonics because they may be conveniently used in the switching of …

We investigate a codirectional nonlinear coupler composed of two Kerr nonlinear
waveguides taking into account linear as well as nonlinear coupling. We calculate …

Based on processes involving the cascading of two successive second-order nonlinear
interactions, we show how novel, all-optical approaches to signal processing can be …

The quantum two-mode nonlinear directional coupler exhibits intriguing variations on the
self-trapping effect seen in the corresponding classical model. We study and compare the …

Emerging silicon nitride (SiN) nanophotonic circuits are an advantageous technology for
dense wavelength division multiplexing systems but they have larger footprints than silicon …

We consider a model of two linearly coupled second-harmonic-generating waveguides. The
analysis is focused on the case of no walkoff and full matching. We demonstrate existence of …

We introduce the notion of a PT-symmetric dimer with a χ (2) nonlinearity. Similarly to the
Kerr case, we argue that such a nonlinearity should be accessible in a pair of optical …