Far-detuned parametric sidebands via multiple intermodal four-wave mixing in communication fiber

We present a detailed investigation of multiple intermodal four-wave mixing (IMFWM) in the standard communications-grade fiber when it is pumped in the deep normal dispersion regime with Q-switched nanosecond pulses at 532 nm. A brief theoretical analysis based on coupled nonlinear Schrödinger equation under quasi-cw approximation, considering different modes for pumping, is carried out to identify all the allowed phase-matched Stokes and anti-Stokes waves having degenerate and non-degenerate mode configurations. With the first-order anti-Stokes thus generated as the secondary pump, the cascaded IMFWM can produce discrete emission in the ultraviolet range near 390 nm. © Anita Publications. All rights reserved.