Rare Earth Doped Single Polarization Double Clad Optical Fiber with Plurality of Air Holes.

摘要

An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n(sub 1); (ii) a silica based inner cladding surrounding the core and having a second index of refraction n(sub 2), such that n(sub 1)>n(sub 2), said inner cladding having a plurality of air holes extending longitudinally through the length of said optical fiber; (iii) a silica based outer cladding surrounding said inner cladding and having a third index of refraction n(sub 3), such that n(sub 2)>n(sub 3), wherein said optical fiber supports a single polarization mode within the operating wavelength range.