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 (12) having a first index of refraction nSUB1/SUB; (ii) a silica based inner cladding (14) surrounding the core and having a second index of refraction nSUB2/SUB, such that nSUB1/SUBnSUB2/SUB, the inner cladding having a plurality of air holes (24, 26) extending longitudinally through the length of the optical fiber; (iii) a silica based outer cladding (16) surrounding the inner cladding and having a third index of refraction nSUB3/SUB, such that nSUB2/SUBnSUB3/SUB; wherein the optical fiber supports a single polarization mode within the operating wavelength range.