This work presents a demodulation technique using a silicon micro-ring resonator that extracts wavelength information from a FBG sensor. The device implements an interrogation system employing a signal processing technique that translates the peak wavelength position of a FBG spectral line into a time interval measurement. To determine the peaks, three techniques were applied. One was based on a simple maximum detection algorithm, the other two, enhanced the detected signal by applying a finite impulse filter (FIR) and a smoothing filter. Results show an improvement of the wavelength measurement using the filtering technique compared to the maximum peak detection.

Date Published: 13 May 2015
PDF: 8 pages
Proc. SPIE 9480, Fiber Optic Sensors and Applications XII, 94800P (13 May 2015); doi: 10.1117/12.2179044

Published in SPIE Proceedings Vol. 9480:
Fiber Optic Sensors and Applications XII
Gary Pickrell; Eric Udd; Henry H. Du, Editor(s)