In general applications, the output signals of the fiber-optic interferometric sensor (FOIS) need some demodulation techniques to linearly demodulate the sensing phase signal. The common signal demodulation circuit of the FOIS is passive homodyne demodulation using phase-generated carrier [(PGC) demodulation]. Preliminary analysis of the research demonstrates that a variation in the output demodulated signal is related to the length of the fiber, and the output demodulated signal will approach zero at some certain lengths of the fiber. To improve the performance of the FOIS, it is necessary to develop the modified PGC demodulation to compensate for the propagation delay of the fiber.
© 2007 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: March 16, 2007
Revised Manuscript: July 7, 2007
Manuscript Accepted: August 26, 2007
Published: October 22, 2007
Shih-Chu Huang and Hermann Lin, "Modified phase-generated carrier demodulation compensated for the propagation delay of the fiber," Appl. Opt. 46, 7594-7603 (2007)