Radiation mode resonances of tilted fiber Bragg gratings for highindex media measurement

摘要

We propose and experimentally demonstrate the feasibility high refractive indices measurement (larger than the fiber cladding index) by using individual radiation mode resonances of tilted fiber Bragg gratings. By tracking a single cladding mode relative to the Bragg resonance, improved sensitivity for refractive index measurement has been achievedand the temperature fluctuations could be eliminated. The maximum index sensitivity is 5 ×10~(-4) with a detected powerresolution of 0.1 dB.