Title :
An optical phase amplification technique for interrogating fiber resonator sensors
Author :
Koo, K.P. ; Kersey, A.D.
Author_Institution :
SFA Inc., Landover, MD, USA
Abstract :
We describe a technique for the effective amplification of small phase changes induced by cavity perturbations of a resonant fiber-optic sensor. The scheme utilizes an unbalanced two-beam "read-out" interferometer to monitor weak frequency shifts in a laser source locked to the resonant sensor. Results are presented using a fiber ring resonator sensor and Mach-Zehnder read-out interferometer with a system phase gain factor of 43.<>
Keywords :
Mach-Zehnder interferometers; fibre optic sensors; light interferometers; optical resonators; Mach-Zehnder read-out interferometer; cavity perturbations; fiber ring resonator sensor; fiber-optic sensor; frequency shifts; interrogation; laser source; optical phase amplification; phase gain factor; unbalanced two-beam interferometer; Fiber lasers; Frequency; Monitoring; Optical fiber sensors; Optical interferometry; Optical ring resonators; Optical sensors; Resonance; Sensor phenomena and characterization; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
