Experimental Research on Spiral Macrobend Loss of Multimode Fibers

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Spiral macrobend losses of silica multimode fibers were investigated experimentally with LED light source having a central wavelength of 890 nm. It is indicated that the bend loss vary acutely with change of real curvature radius of fiber axis when the latter is less than about 3 cm. The bend loss oscillation phenomenon caused by the whispering-gallery mode has been observed when the real curvature radii are in the range of 1.77-1.87 cm. The real curvature radius and the number of spirals are the main factors affecting bend loss and there is an approximate linear relation between bend loss and the product of the square of real curvature and the number of spirals. The modified forms of the Marcuse formula or the Petermann formula of bend loss by a multiplication factor called as winding circle density, i.e. the number of spirals on unit length of curved part of optical fiber, can fit the experimental data better.

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2321-2329

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September 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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