Process and equipment for measuring the cut-off wavelength...

Details Process and equipment for measuring the cut-off wavelength... Process and equipment for measuring the cut-off wavelength...

G - Physics

01

M

73/53, 73/55

G01M 11/00 (2006.01) G01M 11/08 (2006.01)

Patent

CA 1225843

ABSTRACT A process for measuring the cut-off wavelength of higher order propagation modes in optical fibres is based on the fact that the introduction of perturbations in the trans- mission characteristics of an optical fibre can generate greater losses in higher order modes. A spectral scanning of the fibre output power is effected under a number of different perturbation conditions and the values obtained are combined so as to determine the fraction of power prop- agated in the fundamental mode. The cut-off wavelength is defined as that where this fraction exceeds a certain value.

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