Journal
OPTICS EXPRESS
Volume 16, Issue 11, Pages 7726-7738Publisher
Optica Publishing Group
DOI: 10.1364/OE.16.007726
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We introduce a closed-loop feedback technique to actively control the coupling condition of an optical cavity, by employing amplitude modulation of the interrogating laser. We show that active impedance matching of the cavity facilitates optimal shot-noise sensing performance in a cavity enhanced system, while its control error signal can be used for intra-cavity absorption or loss signal extraction. We present the first demonstration of this technique with a fiber ring cavity, and achieved shot-noise limited loss sensitivity. We also briefly discuss further use of impedance matching control as a tool for other applications. (C) 2008 Optical Society of America.
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