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LOW-LOSS POLARIZATION PRESERVING FIBER BY PREFORM DEFORMATION

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Abstract

The new technique described as preform deformation1 can now produce kilometer lengths of uniform birefringent fiber with excellent polarization holding characteristics and low optical losses. Typical losses are within 0.3 dB/km of the best fibers of any kind over the entire useful spectral range from the blue to the infrared. These noncircular birefringent fibers have several inherent advantages. The external shape is approximately rectangular which facilitates location of the principal axis and orientation of the fiber for various applications. The flat shape also reduces polarization breakdown from some perturbations such as bending.2 The fibers typically have round cores of pure or weakly-doped silica, numerical apertures consistant with existing communications fibers and are made by techniques compatible with existing MCVD technology.

© 1985 Optical Society of America

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