Experimental study of supercontinuum generation in step-index highly nonlinear fibers

In this work, supercontinuum (SC) generation in three kinds of step-index highly nonlinear fibers (HNLFs) are experimentally investigated. The generated SC spectra are compared with each other by changing the numbers and wavelengths of the pump sources, and also by employing the HNLFs with different refractive-index differences between the core and the cladding. The widest spectral range of generated SC was about 2650 nm covering from 350 to 3000 nm when using the three pump wavelengths of 800, 1400 and 1867 nm. The results demonstrate that the step-index HNLFs have excellent performances for SC generation and great potentials for the realization of all-fiber SC source.

All-Optical 40 Channels Regenerator Based on Four-Wave Mixing

We have proposed a novel multi-channel regeneration scheme for wavelength division multiplexed systems, which is based on four wave mixing in a highly nonlinear fiber. A 40-channel wavelength division multiplexed signal having data rate of 10 Gbps per channel is divided into five groups. Each group is composed of eight channels and requires a single pump laser source and two segments of highly nonlinear fibers to regenerate the eight channels. Therefore, our proposed scheme requires four times lesser number of highly nonlinear fibers compared to the previously proposed techniques. The regeneration performance for all the forty channels is presented through bit error rate analysis at low optical signal to noise ratio of 15 dB. Simulation results show that an average improvement of 4.246 dB, 3.935 dB, 3.72 dB, 2.71 dB and 2.593 dB in receiver sensitivities has been observed for all the five groups of channels, respectively.