On a possible method to measure the radial profile of the photoelastic constant in step-index optical fiber

Acheroy, Sophie; Merken, Patrick; Geernaert, Thomas; Ottevaere, Heidi; Thienpont, Hugo; Berghmans, Francis

doi:10.1117/12.2050343

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…The inverse Abel transform of the retardance allows obtaining C(r). In previous publications we have detailed a measurement method to obtain the retardance profile of the fiber [13,14]. We recall the main steps below for the sake of completeness.…”

Section: Retardance Measurementmentioning

confidence: 99%

Determination of the radial profile of the photoelastic coefficient of polymer optical fibers

et al. 2016

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We determine the radial profile of the photoelastic constant C(r) in two single mode and one multimode polymer optical fibers (POFs), all fabricated from polymethylmethacrylate (PMMA). To determine C(r) we first determine the retardance of the laterally illuminated fiber submitted to a known tensile stress uniformly distributed over the fiber cross-section. Then we determine the inverse Abel transform of the measured retardance to finally obtain C(r). We compare two algorithms based on the Fourier theory to perform the inverse transform. We obtain disparate distributions of C(r) in the three fibers. The mean value of C(r) varies from-7.6×10 -14 to 5.4×10 -12 Pa -1 . This indicates that, in contrast to glass fibers, the radial profile of the photoelastic constant can considerable vary depending on the type and treatment of POFs, even when made from similar materials, and hence the photoelastic constant should be measured for each type of POF.

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Section: Retardance Measurementmentioning

confidence: 99%

Determination of the radial profile of the photoelastic coefficient of polymer optical fibers

et al. 2016

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“…The purpose of this manuscript is therefore to describe a measurement method to determine the radial distribution of C(r) along the fiber section, with r the radial distance from the center of the fiber. The determination of C(r) requires first to measure the retardance profile R(y) of a transversally illuminated fiber as a function of the tensile load applied to the fiber, where y is taken perpendicularly to the projected fiber axis [7][8][9]. The inverse Abel transform of R(y) allows obtaining the radial profile of C(r).…”

Section: Inverse Abel Transform Algorithms To Determine the Radial Profile Of The Photoelastic Coefficient Of Glass Optical Fibers 1 Intrmentioning

confidence: 99%

“…A detailed description of the measurement method that we use to determine the radial distribution of the photoelastic constant C(r) in an optical fiber is available in previous work [9,12]. We shortly recall the measurement principle below for sake of completeness.…”

Section: Determination Of the Retardancementioning

confidence: 99%

Inverse Abel transform algorithms to determine the radial profile of the photoelastic coefficient of glass optical fibers

et al. 2016

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We compare two algorithms to determine the radial profile of the photoelastic coefficient C in glass optical fibers. We first measure the retardance profile of a transversally illuminated fiber as a function of tensile load. The radial profile C(r) is obtained from the inverse Abel transform of this retardance profile. Our first algorithm expands the measured retardance in its Fourier coefficients before computing the inverse Abel transform. With the second algorithm the expected result of the inverse Abel transform is expanded and the forward Abel transform of that expansion is compared to the measured retardance. We apply both approaches on the retardance measurement of commercially available single mode and multi-mode fibers.

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Thermal effects on the photoelastic coefficient of polymer optical fibers

et al. 2016

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We measure the radial profile of the photoelastic coefficient C(r) in single-mode polymer optical fibers (POFs), and we determine the evolution of C(r) after annealing the fibers at temperatures from 40°C to 80°C. We demonstrate that C(r) in the fibers drawn from a preform without specific thermal pre-treatment changes and converges to values between 1.2 and 1.6×10^-12 Pa^-1 following annealing at 80°C. The annealed fibers display a smoothened radial profile of C(r) and a lowered residual birefringence. In contrast, the mean value of C(r) of the fiber drawn from a preform that has been pre-annealed remains constant after our annealing process and is significantly higher, i.e., 4×10^-12 Pa^-1. The annealing process decreases the residual birefringence to a lower extent as well. These measurements indicate the impact of annealing on the thermal stability of the photoelastic coefficient of POFs, which is an essential characteristic in view of developing POF-based thermo-mechanical sensors.

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On a possible method to measure the radial profile of the photoelastic constant in step-index optical fiber

Cited by 3 publications

References 12 publications

Determination of the radial profile of the photoelastic coefficient of polymer optical fibers

Determination of the radial profile of the photoelastic coefficient of polymer optical fibers

Inverse Abel transform algorithms to determine the radial profile of the photoelastic coefficient of glass optical fibers

Thermal effects on the photoelastic coefficient of polymer optical fibers

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