Tilted short-period fibre-Bragg-grating-induced coupling to cladding modes for accurate refractometry

By G. Laffont, P. Ferdinand. 2001

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Biosensing with optical fiber gratings (2017, positive): “Another approach relies on the intrinsic SRI sensitivity of the cladding modes excited by a tilted FBG (TFBG) [9].”
Towards a Uniform Metrological Assessment of Grating-Based Optical Fiber Sensors: From Refractometers to Biosensors (2017, methodology): “In the case of the TFBG, the Bragg condition given in Equation (1) has to be rewritten by taking into account the resonance wavelength λres (m) of each m-th cladding mode, as follows [13]: λ ( ) = n − n ( ) , (2) where θ is the tilt angle of the grating and n ( ) is the effective RI of the m-th clad”
Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor (2005, background): “field of the guided mode to the surrounded measurand [1], [2], or tilted to increase the coupling efficiency from the guided mode to some cladding modes [3].”