Ultrawide-range four-wave mixing in Raman distributed-feedback fiber lasers

Abstract

We report ultrawide-range and highly efficient wavelength conversion by exploiting four-wave mixing (FWM) in Raman distributed-feedback (R-DFB) fiber lasers. The lasers are 30 cm long center π phase-shifted DFB gratings UV written in commercially available germano-silica (Ge/Si) single-mode fibers (PS980 from Fibercore Ltd., and UHNA4 from Nufern). The R-DFB lasing signal acts as a pump wave for the FWM process within the DFB cavity, and the obtained FWM conversion efficiency is around -25 dB with a maximum wavelength conversion range of 112 nm.

Coherent Raman lasing in a short polarization-maintaining fiber with a random fiber Bragg grating array

“…The FWM line is observed in the forward output spectrum only, while Stokes generation is detected at both output ends; see figures 7(a) and (b). This implies that the FWM between the pump laser and co-propagating Stokes waves satisfies the phase-matching condition k 2 = 2k 1 − k 0 , where k j are the propagation constants [16]. The pump laser wavelength tuning leads to the variation of frequency difference Δ = ω 0 − ω 1 (≈2π • 13 THz) and the FWM (idler) wavelength respectively; see figure 7(a).…”

Detailed study of four-wave mixing in Raman DFB fiber lasers

“…Recently, ultra-compact FWM in a 30 cm-long R-DFB fiber laser was demonstrated [15]. Here, the generated R-DFB signal acts as the pump for the FWM and the DFB cavity significantly enhances the wavelength conversion efficiency.…”