RARE EARTH DOPED SINGLE POLARIZATION DOUBLE CLAD OPTICAL FIBER WITH PLURALITY OF AIR HOLES

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An optical fiber including : (i) a silica based, rare earth doped core having a first index of refraction n1; (ii) a silica based inner cladding surrounding the core and having a second index of refraction n2, such that n1> n2, 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 n3, such that n2> n3; wherein said optical fiber supports a single polarization mode within the operating wavelength range.