Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Marques, Carlos; Bilro, Lúcia; Webb, David J.; Nogueira, Rogério N.

doi:10.1117/12.2026089

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…Since then, strong progress has been made and polymer optical FBGs (POFBGs) are now routinely manufactured, mainly using the phase-mask technique, either under static exposition [2][3][4] or with a laser beam scanning along the fiber axis [5][6][7]. Besides, the point-by-point technique has also been exploited to produce fourth order gratings In this paper, we study for the first time birefringence effects in highly reflective POFBGs, allowing us to use them for temperature-insensitive transverse force sensing.…”

Section: Introductionmentioning

confidence: 99%

Polarization effects in polymer FBGs: study and use for transverse force sensing

Sáez-Rodríguez²,

Bang

et al. 2015

Opt. Express

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Bragg gratings photo-inscribed in polymer optical fibers (POFs) are more sensitive to temperature and pressure than their silica counterparts, because of their larger thermo-optic coefficient and smaller Young's modulus. Polymer optical fiber Bragg gratings (POFBGs) are most often photo-written in poly(methylmethacrylate) (PMMA) based materials using a continuous-wave 325 nm HeCd laser. In this work, we present the first study about birefringence effects in POFBGs manufactured in different types of fiber. To achieve this, highly reflective (> 90%) gratings were produced with the phase mask technique. Their spectral response was then monitored in transmission with polarized light. Polarization dependent loss (PDL) and differential group delay (DGD) were computed from the Jones matrix eigenanalysis using an optical vector analyzer. Maximum values exceeding several dB and a few picoseconds were obtained for the PDL and DGD, respectively. An inverse scattering technique applied to the experimental data provided an estimate of the photo-induced birefringence value arising from the side fabrication process. The response to lateral force was finally investigated for various incident directions using the PDL response of FBGs manufactured in step-index POFs. As the force induced birefringence adds to the photo-induced one, a force dependent evolution of the PDL maximum value was noticed, with a good temperatureinsensitivity.

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Section: Introductionmentioning

confidence: 99%

Polarization effects in polymer FBGs: study and use for transverse force sensing

Sáez-Rodríguez²,

Bang

et al. 2015

Opt. Express

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“…It has come to the attention of IOP Publishing that this article should not have been submitted for publication owing to its substantial replication of a paper published in parallel [1]. Similar material is also presented in a conference paper [2]. The Journal of Optics article was submitted by Carlos A F Marques without the knowledge of the other authors.…”

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confidence: 94%

Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Marques

Bilro

Alberto

et al. 2013

J. Opt.

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We report on the production and characterization of narrow bandwidth fiber Bragg gratings (FBGs) in two spectral regions using polymer optical fibers (POFs). Narrow bandwidth FBGs are increasingly important for POF transmission systems, WDM technology and sensing applications. Long FBGs with resonance wavelength around 850 nm and 1550 nm were fabricated in several types of polymer optical fibers. The 3 dB FBG bandwidth varies from 0.22 nm down to 0.045 nm considering a Bragg grating length of 10 mm and 25 mm, respectively.

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“…Fiber Bragg gratings (FBGs) were first fabricated in polymer optical fibers (POFs) in 1999 1 . Since then, Polymer optical FBGs have been photo-inscribed point-by-point 2 and with the phase mask technique, including single exposure [3][4][5] and laser beam scanning 6,7 . FBGs inscribed in POFs present several attractive features for sensing purposes.…”

Section: Introductionmentioning

confidence: 99%

Investigations on birefringence effects in polymer optical fiber Bragg gratings

Sáez-Rodríguez

Bang

et al. 2014

SPIE Proceedings

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Step-index polymer optical fiber Bragg gratings (POFBGs) and microstructured polymer optical fiber Bragg gratings (mPOFBGs) present several attractive features, especially for sensing purposes. In comparison to FBGs written in silica fibers, they are more sensitive to temperature and pressure because of the larger thermo-optic coefficient and smaller Young's modulus of polymer materials. (M)POFBGs are most often photowritten in poly(methylmethacrylate) (PMMA) materials using a continuous-wave 325 nm HeCd laser. For the first time to the best of our knowledge, we study photoinduced birefringence effects in (m)POFBGs. To achieve this, highly reflective gratings were inscribed with the phase mask technique. They were then monitored in transmission with polarized light. For this, (m)POF sections a few cm in length containing the gratings were glued to angled silica fibers. Polarization dependent loss (PDL) and differential group delay (DGD) were computed from the Jones matrix eigenanalysis using an optical vector analyser. Maximum values exceeding several dB and a few picoseconds were obtained for the PDL and DGD, respectively. The response to lateral force was finally investigated. As it induces birefringence in addition to the photo-induced one, an increase of the PDL and DGD values were noticed.

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Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Cited by 4 publications

References 18 publications

Polarization effects in polymer FBGs: study and use for transverse force sensing

Polarization effects in polymer FBGs: study and use for transverse force sensing

Inscription of narrow bandwidth Bragg gratings in polymer optical fibers

Investigations on birefringence effects in polymer optical fiber Bragg gratings

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