This Letter proposes an optical fiber radio frequency (RF) Mach–Zehnder interferometer (MZI) for sensing applications. An RF modulated laser source is injected into an optical fiber RF-MZI and collected by a photodiode. The interference pattern is observed in the RF domain by sweeping the frequency using a network analyzer. The proposed sensor has a linear response to applied temperature change. In addition, the sensitivity, observation frequency range, and the length of the sensing arm are discussed.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: October 11, 2011
Revised Manuscript: January 2, 2012
Manuscript Accepted: January 3, 2012
Published: February 13, 2012
Tao Wei, Jie Huang, Xinwei Lan, Qun Han, and Hai Xiao, "Optical fiber sensor based on a radio frequency Mach–Zehnder interferometer," Opt. Lett. 37, 647-649 (2012)