A novel method for characterization of optical fiber resonators by an optical time-domain reflectometry (OTDR) technique is reported. This easy-to-use technique yields accurate results for cavity lengths ranging from a few meters to several kilometers. A simple relationship is established between the round-trip cavity loss and the position where the OTDR signal is maximum. The value obtained for the round-trip cavity loss turns out to be quite insensitive to uncertainties in the determination of the OTDR maximum position.
© 1997 Optical Society of America
A. Küng, J. Budin, L. Thévenaz, and Ph.A. Robert, "Optical fiber ring resonator characterization by optical time-domain reflectometry," Opt. Lett. 22, 90-92 (1997)