Measurement of UV-induced absorption and scattering losses in photosensitive fibers

X. Roselló-Mechó; M. Delgado-Pinar; J. L. Cruz; A. Díez; M. V. Andrés

doi:10.1364/OL.43.002897

Optics Letters
Vol. 43,
Issue 12,
pp. 2897-2900
(2018)
•https://doi.org/10.1364/OL.43.002897

Measurement of UV-induced absorption and scattering losses in photosensitive fibers

X. Roselló-Mechó, M. Delgado-Pinar, J. L. Cruz, A. Díez, and M. V. Andrés

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X. Roselló-Mechó, M. Delgado-Pinar, J. L. Cruz, A. Díez, and M. V. Andrés, "Measurement of UV-induced absorption and scattering losses in photosensitive fibers," Opt. Lett. 43, 2897-2900 (2018)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: February 19, 2018
- Revised Manuscript: May 16, 2018
- Manuscript Accepted: May 20, 2018
- Published: June 13, 2018

Abstract

UV-assisted fabrication of gratings using photosensitive fibers is a well-established technique, based on the UV-induced permanent modification of the refractive index of the fiber material. As a result, the absorption coefficient is also changed. Here, we exploit the thermal sensitivity of whispering gallery mode resonances of the fiber itself to measure the profile of the heating along an irradiated fiber versus the input power and for different UV radiation intensities. Our technique allows discriminating between the absorption and scattering contributions to the overall losses, by comparing the results obtained with our technique with direct transmission measurements. Different photosensitive fibers are characterized by means of this technique. Nonuniform UV irradiation of photosensitive fibers can be characterized with this technique.

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	WGM Resonances $Δ T / P$ (°C/W)		Direct Measurement $α$ (dB/km)
	Irradiated	Pristine	Irradiated	Pristine
PS980	$26.48 \pm 0.15$	$0.718 \pm 0.014$	$6200 \pm 400$	$120 \pm 2$ ^a
PS1250	$30.80 \pm 0.17$	$0.768 \pm 0.014$	$6600 \pm 400$	131.1^b
$H_{2} - SMF 28$	$23.48 \pm 0.13$	$0.815 \pm 0.012$	$5600 \pm 400$	n/a^c
SM1500	$1.20 \pm 0.03$	$< 0.03$ ^d	$370 \pm 90$	1.95^b

	WGM Resonances $α_{2}^{abs} / α_{1}^{abs}$	Direct Measurement $α_{2} / α_{1}$
PS980	$36.9 \pm 0.7$	$52 \pm 3$
PS1250	$40.1 \pm 0.8$	$50 \pm 3$
$H_{2} - SMF 28$	$28.8 \pm 0.5$	n/a^a
SM1500	$> 40$ ^b	$190 \pm 50$

	$α^{abs}$ (dB/km)		$α^{scat}$ (dB/km)
	Irradiated	Pristine	Irradiated	Pristine
PS980	$3680 \pm 20$	$99.7 \pm 1.9$	$2500 \pm 400$	$20 \pm 3$
PS1250	$4280 \pm 20$	$106.6 \pm 1.9$	$2300 \pm 400$	$24.5 \pm 1.9$
$H_{2} - SMF 28$	$3260 \pm 18$	$113.1 \pm 1.7$	$2300 \pm 400$	n/a^a
SM1500	$167 \pm 4$	$< 1.95$ ^b	$200 \pm 90$	$< 1.95$ ^b

	WGM Resonances $Δ T / P$ (°C/W)		Direct Measurement $α$ (dB/km)
	Irradiated	Pristine	Irradiated	Pristine
PS980	$26.48 \pm 0.15$	$0.718 \pm 0.014$	$6200 \pm 400$	$120 \pm 2$ ^a
PS1250	$30.80 \pm 0.17$	$0.768 \pm 0.014$	$6600 \pm 400$	131.1^b
$H_{2} - SMF 28$	$23.48 \pm 0.13$	$0.815 \pm 0.012$	$5600 \pm 400$	n/a^c
SM1500	$1.20 \pm 0.03$	$< 0.03$ ^d	$370 \pm 90$	1.95^b

	WGM Resonances $α_{2}^{abs} / α_{1}^{abs}$	Direct Measurement $α_{2} / α_{1}$
PS980	$36.9 \pm 0.7$	$52 \pm 3$
PS1250	$40.1 \pm 0.8$	$50 \pm 3$
$H_{2} - SMF 28$	$28.8 \pm 0.5$	n/a^a
SM1500	$> 40$ ^b	$190 \pm 50$

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Optics Letters