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Experiments are reported that demonstrate the ability of OTDR to measure core diameter fluctuations. A waveguide with nearly sinusoidal o.d. fluctuations of 2.5-μm amplitude (1.0-μm core diam variation) was measured. The results indicate a change in local waveguide attenuation of 1.5-dB/km/μm change in core diameter.
© 1981 Optical Society of America
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