We demonstrate a high performance wavelength demodulator for DFB FL sensor using novel PGC algorithm and reference compensation method (RCM). An unbalanced fiber Michelson interferometer is employed and the phase demodulation is accomplished by a digital PGC-Arctan-DSM algorithm. The RCM is adopted to eliminate the environmental noise using a shielded and multiplexed DFB FL as a reference. Experimental results have demonstrated a resolution of 3.5×10-7 pm/√Hz, a dynamic range of 120 dB @ 100 Hz, a THD of below 0.1 %, and a linearity of 99.99 %. More than 50 dB reduction of the environmental noise has been experimentally achieved within 10-1000 Hz.

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775333 (17 May 2011); doi: 10.1117/12.885823

Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)