Continuous-wave, high-power, Raman continuum generation in holey fibers

Abstract

The possibility of using low pump power for cw Raman continuum generation is demonstrated by optimization of the pump peak power and by accounting for the loss-related reduction of the effective length of Raman interaction in holey fibers. A 3.8-W, 324-nm-wide cw Raman continuum with a spectral power density higher than 10 mW/nm is generated in a completely fiber-integrated, single-mode format.

Experimental investigation of the effect of pump incoherence on nonlinear pump spectral broadening and continuous-wave supercontinuum generation

“…Previous experiments on CW spectral broadening and supercontinuum generation have been performed both in standard telecommunication fibers 6, 7 and in highly nonlinear holey fibers. 8 However, until recently, little effort had been done to clarify the dynamics of the process, and in particular the remarkable smoothness of CW SC spectra. Recent papers have…”

Progress in Continuous-Wave Supercontinuum Generation

“…The spectral broadening was relatively restricted (around 200 nm) because it was mainly due to Raman effect Gonzalez-Herraez et al (2003); Persephonis et al (1996); Prabhu et al (2000). A breakthrough was reached a few years later when stronger pump lasers (from more than one order of magnitude) based on Ytterbium doped fibers were combined with photonic crystal fibers 4 www.intechopen.com (PCFs) owing a low group-velocity dispersion (GVD) value around the pump wavelength Avdokhin et al (2003). With these setups, SC generation was mainly due to solitonic effects like in pulsed SC.…”

Optical Coherence Tomography Based on a Continuous-wave Supercontinuum Seeded by Erbium-doped Fiber's Amplified Spontaneous Emission

“…On the other hand, SC was also found to be generated in the continuous-wave (CW) mode by using a partiallycoherent CW pump beam [10][11][12][13]. The physical mechanism for CW SC evolution in optical fiber is slightly different from pulse-mode SC evolution [10][11][12][13].…”

“…The physical mechanism for CW SC evolution in optical fiber is slightly different from pulse-mode SC evolution [10][11][12][13]. Modulation instability (MI) converts an initial, partially-coherent CW beam coupled into a nonlinear anomalous-dispersion fiber into large numbers of ultrashort soliton-like pulses.…”