Filter fiber for use in Raman lasing applications and techniques for manufacturing same
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United States of America Patent
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Apr 23, 2013
Grant Date -
Nov 11, 2010
app pub date -
May 11, 2010
filing date -
May 11, 2009
priority date (Note) -
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Abstract
An optical waveguide has a refractive index variation that is structured to provide the fiber, over a wavelength operating range, with an effective area supporting multiple Stokes shifts and with a negative dispersion value at a target wavelength within the wavelength operating range. The refractive index variation is further structured to provide the fiber with a finite LP01 cutoff at a wavelength longer than the target wavelength, whereby the LP01 cutoff wavelength provides a disparity, for a selected bending diameter, between macrobending losses at the target wavelength and macrobending losses at wavelengths longer than the target wavelength, whereby Raman scattering is frustrated at wavelengths longer than the target wavelength.
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