Patent ID: 7151249
Filing Date: 2006-12-19
Classification: G01M

Abstract:
1. A method for determining a cut-off wavelength of an optical fibre, the method comprising: i) providing a spectral measurement setup, ii) carrying out a spectral measurement on the optical fibre using the spectral measurement setup at a specific wavelength, iii) bending the optical fibre, iv) carrying out a spectral measurement on the bent optical fibre, using the spectral measurement setup, at the specific wavelength, v) determining a bend attenuation on a basis of measuring results obtained in steps ii) and iv), and vi) determining a cut-off wavelength of the optical fibre based on the bend attenuation and a mode field diameter of the optical fibre by correlating the cut-off wavelength of the optical fibre to the bend attenuation and the mode field diameter of the optical fibre on the basis of a previously determined correlation between bend attenuation and cut-off wavelength.