Negative-curvature Anti-resonant Fiber Coupling Tolerances

Bartłomiej Siwicki, Richard Carter, Jonathan D. Shephard, Fei Yu, Jonathan C. Knight, Duncan Paul Hand

Research output: Contribution to journalArticle

Abstract

We investigate coupling tolerances of selected designs of negative-curvature anti-resonant fibers (NC-ARFs) with open- and closed-boundary types of structure under linear and angular misalignment of the input near-infrared laser beam. The coupling tolerances of NC-ARFs are compared with those of a commercially available step-index fiber. The expected coupling efficiency for the step-index fiber is calculated using scalar diffraction theory and directly compared with measured profiles. We show that the analyzed NC-ARFs can provide lower sensitivity to input beam misalignment than the step-index fiber, despite having a numerical aperture approximately half of that of the step-index fiber (0.044 compared to 0.07 respectively). In particular, a nodeless design is only half as sensitive to input linear misalignment than the step-index fiber, whilst having an almost identical sensitivity to tilt. A 3.5 μm linear shift and 22 mrad tilt result in 10% decrease in total output power of the beam. The good match between experiment and calculations suggests that the profiles measured for NC-ARFs are correct.
Original languageEnglish
Number of pages11
JournalJournal of Lightwave Technology
Early online date23 Aug 2019
DOIs
Publication statusE-pub ahead of print - 23 Aug 2019

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curvature
fibers
misalignment
sensitivity
numerical aperture
profiles
infrared lasers
laser beams
scalars
output
shift
diffraction

Cite this

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title = "Negative-curvature Anti-resonant Fiber Coupling Tolerances",
abstract = "We investigate coupling tolerances of selected designs of negative-curvature anti-resonant fibers (NC-ARFs) with open- and closed-boundary types of structure under linear and angular misalignment of the input near-infrared laser beam. The coupling tolerances of NC-ARFs are compared with those of a commercially available step-index fiber. The expected coupling efficiency for the step-index fiber is calculated using scalar diffraction theory and directly compared with measured profiles. We show that the analyzed NC-ARFs can provide lower sensitivity to input beam misalignment than the step-index fiber, despite having a numerical aperture approximately half of that of the step-index fiber (0.044 compared to 0.07 respectively). In particular, a nodeless design is only half as sensitive to input linear misalignment than the step-index fiber, whilst having an almost identical sensitivity to tilt. A 3.5 μm linear shift and 22 mrad tilt result in 10{\%} decrease in total output power of the beam. The good match between experiment and calculations suggests that the profiles measured for NC-ARFs are correct.",
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year = "2019",
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language = "English",
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Negative-curvature Anti-resonant Fiber Coupling Tolerances. / Siwicki, Bartłomiej; Carter, Richard; Shephard, Jonathan D.; Yu, Fei; Knight, Jonathan C.; Hand, Duncan Paul.

In: Journal of Lightwave Technology, 23.08.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Negative-curvature Anti-resonant Fiber Coupling Tolerances

AU - Siwicki, Bartłomiej

AU - Carter, Richard

AU - Shephard, Jonathan D.

AU - Yu, Fei

AU - Knight, Jonathan C.

AU - Hand, Duncan Paul

PY - 2019/8/23

Y1 - 2019/8/23

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AB - We investigate coupling tolerances of selected designs of negative-curvature anti-resonant fibers (NC-ARFs) with open- and closed-boundary types of structure under linear and angular misalignment of the input near-infrared laser beam. The coupling tolerances of NC-ARFs are compared with those of a commercially available step-index fiber. The expected coupling efficiency for the step-index fiber is calculated using scalar diffraction theory and directly compared with measured profiles. We show that the analyzed NC-ARFs can provide lower sensitivity to input beam misalignment than the step-index fiber, despite having a numerical aperture approximately half of that of the step-index fiber (0.044 compared to 0.07 respectively). In particular, a nodeless design is only half as sensitive to input linear misalignment than the step-index fiber, whilst having an almost identical sensitivity to tilt. A 3.5 μm linear shift and 22 mrad tilt result in 10% decrease in total output power of the beam. The good match between experiment and calculations suggests that the profiles measured for NC-ARFs are correct.

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