RARE EARTH DOPED SINGLE POLARIZATION DOUBLE CLAD OPTICAL FIBER AND A METHOD FOR MAKING SUCH FIBER

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An optical fiber (10), comprising : (i) a rare earth doped silica based elongated core (12) with a first refractive index (n1 with an aspect ratio of 1.5 to 10; (ii) a silica based moat (13) abutting and at least substantially surrounding the core, the moat having a refractive index n2, wherein n2n3; and n3>n2; (iv) a silica based outer cladding (16) surrounding said inner cladding, the outer cladding having a fourth refractive index (n4), such that n4< n3; the optical fiber exhibits single polarization at the operating wavelength band.