Optical fiber ring resonator characterization by optical time-domain reflectometry

A. Küng; J. Budin; L. Thévenaz; Ph. A. Robert

doi:10.1364/OL.22.000090

Optics Letters
Vol. 22,
Issue 2,
pp. 90-92
(1997)
•https://doi.org/10.1364/OL.22.000090

Optical fiber ring resonator characterization by optical time-domain reflectometry

A. Küng, J. Budin, L. Thévenaz, and Ph. A. Robert

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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)

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Abstract

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.

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Ring Characteristics	OTDR Measurements		Coherent Measurements
Ring Characteristics	$Z_{max} (m)$	$k_{r} (%)$	$T_{min} (%)$	$k_{r} (%)$
$k = 94.8 %$ , $L = 5.568 m$	$136 \pm 1.5$	$97.19 \pm 0.09$	$9 \pm 1$	$97.21 \pm 0.1$
$k = 96.9 %$ , $L = 10 m$	$445 \pm 3$	$98.66 \pm 0.04$	$13 \pm 1$	$98.55 \pm 0.05$
$k = 90.3 %$ , $L = 10 m$	$165 \pm 2$	$98.10 \pm 0.13$	$45 \pm 1$	$98.06 \pm 0.05$
$k = 97.1 %$ , $L = 26.5 m$	$490 \pm 5$	$92.42 \pm 0.1$	$19 \pm 1$	$92.58 \pm 0.15$
$k = 95.0 %$ , $L = 765 m$	$9440 \pm 150$	$89.5 \pm 0.23$

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