Raman and Brillouin couplers with losses and phase mismatch

Abstract

We investigate nonlinear couplers whose operation is based on Raman or Brillouin scattering. A quantum approach is used. Strong coherent laser pumping is assumed and linearized Heisenberg-Langevin equations of motion are solved. The influence of linear coupling constants, losses and phase mismatches on the dynamical behaviour of the coupler is discussed. Quantum statistical properties of optical modes involved in the interaction are investigated within the framework of the generalized superposition of coherent signal and quantum noise. Most attention is devoted to the possibility of generation of non-classical light. It is shown that such light can be generated only in compound modes according to our model and influence of various parameters on the generation is discussed. Optimal conditions for the generation of squeezed light are found.

Single-mode quantum properties of the codirectional Kerr nonlinear coupler: frequency mismatch and exact solution

“…It is worth remembering that the phase mismatches were considered to the other types of coupler, e.g. linear coupler [18], nonlinear coupler [19] and Raman-Brillouin couplers [20].…”

Quantum properties of the codirectional three-mode Kerr nonlinear coupler

“…Quantum mechanically, there are different types of directional couplers. For instance, symmetric coupler [11] (linear (or nonlinear) processes are involved in both the waveguides), asymmetric coupler [12] (at least one of the waveguides possesses different nonlinearity than the others), Raman-Brillouin coupler [13], bandgap coupler [14] and Kerr coupler [15,16,17,18,19,20,21,22]. For more details about their properties the reader can consult the review papers [23].…”