Application of four-wave mixing for estimation of nonlinear parameters in compact ring cavity laser based on Bi-EDF

One of the main degradation effects of optical fibres with dense channel width and poor chromatic dispersion on the fiber is four-wave mixing (FWM). Cross talk produced by four-wave mixing in optical fibers limits the efficiency of long-distance wavelength-division multiplexing (WDM) optical communication systems, which can be regulated for non-linearity purposes in optical telecommunication, particularly when channel wavelengths are set near the zero-dispersion wavelength of optical fibers. As a result, a small fiber segment with a high nonlinearity can be used to support the FWM. Using the four-wave mixing method, the experimental set-up of a compact fiber ring laser based on different lengths of nonlinear Bismuth-Erbium doped fiber (Bi-EDF, ۱۸۱ and ۲۱۵ cm) is used in this paper. Via the degenerate four-wave mixing effect, these two gain nonlinear media have been successfully used to stabilize a dual-wavelength fiber laser with and without nonlinear photonic crystal fiber (PCF) at room temperature for  and n۲ estimation of nonlinear parameters and FWM performance of optical fiber. Experiments show that using a high non-linear bismuth-erbium doped fiber (Bi-EDF) in implementing an FWM program for non-linear PCF parameters has specific and unique benefits. Furthermore, the FWM effect can be used for signal amplification, wavelength transfer, phase conjugation, and high-speed optical switching. The proposed configuration's special function is explained by the Bi-EDF and PCF fiber's coupled relationship in FWM scattering.