Title :
Pumping wavelength dependence of super continuum generation in photonic crystal fibers
Author :
Hansen, Kim P. ; Jensen, Jacob Riis ; Birkedal, Dan ; Hvam, Jørn M. ; Bjarklev, Anders
Author_Institution :
Crystal Fibre A/S, Birkerod, Denmark
Abstract :
Generation of wide super continua several hundred nanometers wide is possible by pumping in the normal dispersion regime as the nonlinear effects broaden the spectra beyond the zero-dispersion wavelength. When pumping far away from the zero-dispersion wavelength, only self phase modulation (SPM) and Raman scattering contributes to the broadening leading to smooth stable spectra of limited width. Pumping closer to the zero-dispersion wavelength forms very broad spectra, but they are far more sensitive to fluctuations in pumping power and coupling efficiency between fiber and laser. The flattest and broadest spectra are achieved by pumping just below zero-dispersion wavelength and increase in power leads to flatter and broader spectrum. Furthermore, pumping close to the zero-dispersion wavelength enables generation of spectral components at shorter wavelengths below 750 nm through a four-wave mixing process.
Keywords :
Raman spectra; fluctuations; light sources; multiwave mixing; optical fibre dispersion; optical pumping; photonic crystals; self-phase modulation; spectral line broadening; 750 nm; Raman scattering; SPM; coupling efficiency; fluctuations; four-wave mixing process; nonlinear effects; normal dispersion regime; photonic crystal fibers; pumping power; pumping wavelength dependence; self phase modulation; smooth stable spectra; spectral line broadening; super continuum generation; very broad spectra; wide super continua; zero-dispersion wavelength; Dispersion; Fiber lasers; Fluctuations; Laser excitation; Optical coupling; Phase modulation; Photonic crystal fibers; Power lasers; Raman scattering; Scanning probe microscopy;
Conference_Titel :
Optical Fiber Communication Conference and Exhibit, 2002. OFC 2002
Print_ISBN :
1-55752-701-6
DOI :
10.1109/OFC.2002.1036604