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Measurement Of The LP11 Mode Cut-Off Wavelength In Monomode Optical Fibres

Methods of determining the LP11 mode cut-off wavelength, λc, have been examined using a range of monomode fibre samples. The results obtained show that bending of the fibre in an uncoated condition can produce large changes in the measured value of λc. In view of the problems associated with the measurement of this parameter doubt is expressed about its use in fibre characterisation.