Determination of the Effective Refractive Index of Various Single Mode Fibres for Fibre Bragg Grating Sensor ApplicationsJuelich Florian

摘要

A method for determining the effective refractive index (n_(eff)) of optical fibres with high accuracy is presented. The measurement principle is based on the inscription process of fibre Bragg gratings (FBG) into the optical fibres. Results of refractive index measurements at ～1535nm wavelength on standard telecommunication and speciality, photosensitive optical fibres are presented. The measured values of n_(eff) correlate with GeO_2 dopant concentration inside the cores of the fibres. This measurement technique can have applications in process control for optical fibre manufacturing and in FBG production technology.