Spectral response of Bragg gratings in multimode polymer waveguides

摘要

A means to calculate the multimodal spectral response of Bragg gratings ingeneral non-circular multimode waveguides is proposed. To illustrate the powerof the technique, the spectra of two Bragg temperature sensors are numericallycalculated in which coupling between 100 modes considered. It is shown how theBragg wavelength in multimode Bragg grating waveguides is affected by thenumber of modes and energy distribution among them. Good matching of thesimulated spectrum of a multimode Bragg grating on a planar inverted ribwaveguide to the measured spectrum is seen.