MEASURING THE CROSS-SECTIONAL DISTRIBUTION OF THE REFRACTIVE INDEX OF OPTICAL WAVEGUIDES Application EP-0509847-A3 European Patent Office 21 Jul 1993
Measuring the cross-sectional distribution of the refractive index of optical waveguides Application EP-0509847-A2 European Patent Office 21 Oct 1992
METHOD OF MEASURING THE REFRACTIVE INDEX PROFILE OF OPTICAL FIBERS Application EP-0259837-A3 European Patent Office 13 Jul 1988
Method of measuring the refractive index profile of optical fibers Application EP-0259837-A2 European Patent Office 16 Mar 1988
Method of determining the refractive index profile of an optical fibre Application EP-0029195-A1 European Patent Office 27 May 1981