FILTER FIBER FOR USE IN RAMAN LASING APPLICATIONS AND TECHNIQUES FOR MANUFACTURING SAME

摘要

The optical waveguide has a refractive index variation over the wavelength operating range, an effective area that supports multiple Stokes shifts, and a negative dispersion value at the target wavelength within the wavelength operating range to provide the fiber with a refractive index variation. The refractive index variation is further configured to provide the fiber with a finite LP ₀₁ cutoff at a wavelength longer than the target wavelength so that the LP ₀₁ cutoff wavelength is determined by the macrobending losses at the target wavelength for the selected bending diameter, Providing a difference between macrobending losses at wavelengths longer than the wavelength, Raman scattering at wavelengths longer than the target wavelength is disturbed.