Recent progress in polymer optical fibre gratings

Zhang, C.; Carroll, Karen; Webb, David J.; Bennion, I.; Kalli, Kyriacos; Emiliyanov, Grigoriy; Bang, Ole; Kjær, Erik Michael; Peng, Gang-Ding

doi:10.1117/12.786097

Cited by 3 publications

(4 citation statements)

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“…Grating writing in other materials is sometimes, in relation to the work done in silica, contentious. Recent demonstrations of gratings in polymer structured fibres, for example, are shown in reflection only because they have been virtually undetectable in transmission [112,113], similar to initial work in regenerated gratings [64]. Further, in addition to the very large losses associated with these structured polymer fibres, mostly made of polymethylmethacrylate (PMMA), there is evidence that the gratings written into them are made up of periodic UV oxidation of the polymer in air along the fibre-in addition to observable coloration with longer exposures, when nitrogen was used to displace air no gratings were able to be inscribed [113].…”

Section: Discussionmentioning

confidence: 99%

“…Recent demonstrations of gratings in polymer structured fibres, for example, are shown in reflection only because they have been virtually undetectable in transmission [112,113], similar to initial work in regenerated gratings [64]. Further, in addition to the very large losses associated with these structured polymer fibres, mostly made of polymethylmethacrylate (PMMA), there is evidence that the gratings written into them are made up of periodic UV oxidation of the polymer in air along the fibre-in addition to observable coloration with longer exposures, when nitrogen was used to displace air no gratings were able to be inscribed [113]. In contrast, however, some interesting results in solid polymer fibre with a special photosensitiser such as trans-4-stilbenemethanol [112][113][114][115] do promise potential applications in biomedicine where some organic compatibility is required.…”

Section: Discussionmentioning

confidence: 99%

“…Further, in addition to the very large losses associated with these structured polymer fibres, mostly made of polymethylmethacrylate (PMMA), there is evidence that the gratings written into them are made up of periodic UV oxidation of the polymer in air along the fibre-in addition to observable coloration with longer exposures, when nitrogen was used to displace air no gratings were able to be inscribed [113]. In contrast, however, some interesting results in solid polymer fibre with a special photosensitiser such as trans-4-stilbenemethanol [112][113][114][115] do promise potential applications in biomedicine where some organic compatibility is required. (The issue of biocompatibility is a complex one that needs full peer review within the medical community, particularly given the increased range of materials, and dopants, being proposed for biomedical applications that often involve invasive procedures within organic tissue.)…”

Section: Discussionmentioning

confidence: 99%

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Properties of Specialist Fibres and Bragg Gratings for Optical Fiber Sensors

Canning

2009

Journal of Sensors

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The advent of optical fibres based on air holes running along their entirety opens up new directions in addressing various properties relevant to sensing, including the temperature/strain challenge of optical fibre sensors. This paper looks at the measurement challenges associated with temperature and strain, examines the potentially unique functionality structured fibre designs with and without gratings open up, and briefly describes some current research directions within conventional fibre and grating technologies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Properties of Specialist Fibres and Bragg Gratings for Optical Fiber Sensors

Canning

2009

Journal of Sensors

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“…12 Moreover in the microstructured POFs (mPOFs) the resulting gratings are also relatively weak. The long inscription time is a result of the relatively weak photosensitivity of polymers.…”

Section: -11mentioning

confidence: 99%

Fiber design and realization of point-by-point written fiber Bragg gratings in polymer optical fibers

et al. 2012

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An increasing interest in making sensors based on fiber Bragg gratings (FBGs) written in polymer optical fibers (POFs) has been seen recently. Mostly microstructured POFs (mPOFs) have been chosen for this purpose because they are easier to fabricate compared, for example, to step index fibers and because they allow to tune the guiding parameters by modifying the microstructure. Now a days the only technique used to write gratings in such fibers is the phase mask technique with UV light illumination. Despite the good results that have been obtained, a limited flexibility on the grating design and the very long times required for the writing of FBGs raise some questions about the possibility of exporting POF FBGs and the sensors based on them from the laboratory bench to the mass production market. The possibility of arbitrary design of fiber Bragg gratings and the very short time required to write the gratings make the point-by-point grating writing technique very interesting and would appear to be able to fill this technological gap. On the other end this technique is hardly applicable for microstructured fibers because of the writing beam being scattered by the air-holes. We report on the design and realization of a microstructured polymer optical fiber made of PMMA for direct writing of FBGs. The fiber was designed specifically to avoid obstruction of the writing beam by air-holes. The realized fiber has been used to point-by-point write a 5 mm long fourth order FBG with a Bragg wavelength of 1518 nm. The grating was inspected under Differential Interferometric Contrast microscope and the reflection spectrum was measured. This is, to the best of our knowledge, the first FBGs written into a mPOF with the point-by-point technique and also the fastest ever written into a polymer optical fiber, with less than 2.5 seconds needed.

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