Optimization of the conversion efficiency and evaluation of the noise figure of an optical frequency converter based on a dual-pump fiber phase sensitive amplifier

Abstract

We propose a new architecture of phase sensitive optical frequency converter based on dual-pump phase sensitive amplification in a highly nonlinear fiber. This frequency converter allows generation of extra tones through nonlinear four-wave mixing between two strong pumps and an input tone. The frequency channel to which the input tone is converted can be chosen by adjusting the phase of the input signal. The conversion efficiency and extinction ratio of this frequency converter are predicted and optimized and its noise figure is calculated using a numerical approach based on the nonlinear Schrödinger equation. A semi-classical noise figure calculation for this approach was used and validated using an analytical fully quantum calculation based on the multi-wave model.

A Comprehensive Study on Phase Sensitive Amplification and Stimulated Brillouin Scattering in Nonlinear Fibers with Longitudinally Varying Dispersion

“…For the fundamental band (q = 0), expression for the gain coefficients (22) represents conventional parametric gain in optical fibers [5,35,44].…”

“…The highest gain occurs for phase-matching condition κ = 0, see Equation (22). The frequency detuning Ω q corresponding to the largest gain coefficient can be found from a polynomial expression:…”

“…The behavior of anti-gain dip can be explained using the analytical model given in Section 3.1. The gain bandwidth of the q-th spectral component is given by the frequency dependency of the gain coefficient (22). The parametric attenuation within selected q-th band is realized under the condition cos(Φ q ) = −1 in Equation (23).…”

“…However, the use of DOFs as a single pump PSA is still an open area of research to the best of our knowledge. Furthermore, with the continual development of newer all optical signal processing capabilities of PSA based systems [19][20][21][22], albeit using multiple pumps, we plan to investigate a single pump DOF based PSA system, where the dispersion variation provides us with an extra degree of freedom for tailoring the system functionalities. To this aim we investigate analytically and numerically the physics of the signal amplification in a DOF acting as a single pump PSA and unravel the relationship between the dispersion profile with various system parameters and investigate its potential for developing wavelength selective wide band tunable filters for optical signal processing applications.…”