Overwrite fabrication and tuning of long period gratings

Partridge, Matthew; James, Stephen W.; Barrington, James; Tatam, Ralph P.

doi:10.1364/oe.24.022345

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…Fortunately, periods of the LPGs considered in this study are among the several hundred micrometers (see the data in Fig. 1(b)), ±1% phase deviation just corresponds to a deviation of ±6 μm in grating period, which is acceptable and realizable by using the current LPG's fabrication platform in [28] and [29], because the commercial translation stage nowadays can easily have a position accuracy up to 0.25 μm, which completely meet the fabrication tolerance demanded for our designs.…”

Section: Effects Of the Coupling Coefficient Deviations On The Lpg's Spectrummentioning

confidence: 82%

Design of an Edge Filter Based on a Phase-Only Modulated Long-Period Fiber Grating

Zhao

Zhu

2018

IEEE Photonics J.

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An efficient edge filter with an ultrabroad dynamic range is first proposed and numerically demonstrated, which is achieved by using a phase-only modulated long-period fiber grating (LPG). As a typical design example, an edge filter with a linear dynamic range of ∼50 nm in wavelength and ∼85% in transmission loss has been successfully obtained, which are the best results reported to date among those of the fiber grating based edge filters. Fabrication tolerance analyses for the designed filter have also been performed. The simulation results show that the designed filter can be practically fabricated according to the position accuracy (±1.5 μm) of the current LPG's fabrication platform.

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Section: Effects Of the Coupling Coefficient Deviations On The Lpg's Spectrummentioning

confidence: 82%

Design of an Edge Filter Based on a Phase-Only Modulated Long-Period Fiber Grating

Zhao

Zhu

2018

IEEE Photonics J.

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“…The central wavelengths of the attenuation bands were obtained using Spectrum Interrogation Routine software [43] and Origin was used for further data analysis. The temperature and relative humidity were kept at the same level during the experiments and simultaneously measured using OneWire device.…”

Section: Methodsmentioning

confidence: 99%

Volatile Organic Compounds Sensing Using Optical Fibre Long Period Grating with Mesoporous Nano-Scale Coating

Hromádka

Korposh

Partridge

et al. 2017

Sensors

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A long period grating (LPG) modified with a mesoporous film infused with a calixarene as a functional compound was employed for the detection of individual volatile organic compounds (VOCs) and their mixtures. The mesoporous film consisted of an inorganic part, SiO2 nanoparticles (NPs), along with an organic moiety of poly(allylamine hydrochloride) polycation PAH, which was finally infused with the functional compound, p-sulphanato calix[4]arene (CA[4]) or p-sulphanato calix[8]arene (CA[8]). The LPG sensor was designed to operate at the phase matching turning point to provide the highest sensitivity. The sensing mechanism is based on the measurement of the refractive index (RI) change induced by a complex of the VOCs with calixarene. The LPG, modified with a coating of 5 cycles of (SiO2 NPs/PAH) and infused with CA[4] or CA[8], was exposed to chloroform, benzene, toluene and acetone vapours. The British Standards test of the VOCs emissions from material (BS EN ISO 16000-9:2006) was used to test the LPG sensor performance.

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“…The LPFGs are fabricated using the approach described in [ 13 ], where the fiber is illuminated, in a point-by-point fashion, by output from a frequency-quadrupled Nd:YAG laser operating at 266 nm, with a 7 ns pulse width, a rep-rate of 10 Hz, a beam diameter of 10 mm, and an average power of 200 mW. The output beam is conditioned using a focusing lens before being passed through a slit placed in front of the optical fiber.…”

Section: Methodsmentioning

confidence: 99%

Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction

Villar

Partridge

Rodríguez

et al. 2017

Sensors

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The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor of 3, to 2611 nm/refractive index unit in the range from 1.333 to 1.4278. The grating period selected for the LPFGs allowed access to the dispersion turning point at wavelengths close to the visible range of the optical spectrum, where optical equipment is less expensive. As an example of an application, a pH sensor based on the deposition of a polymeric coating was analyzed in two situations: with an LPFG without diameter reduction and with an LPFG with diameter reduction. Again, a sensitivity increase of a factor of near 3 was obtained, demonstrating the ability of this method to enhance the sensitivity of thin-film-coated LPFG chemical sensors.

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Overwrite fabrication and tuning of long period gratings

Cited by 11 publications

References 15 publications

Design of an Edge Filter Based on a Phase-Only Modulated Long-Period Fiber Grating

Design of an Edge Filter Based on a Phase-Only Modulated Long-Period Fiber Grating

Volatile Organic Compounds Sensing Using Optical Fibre Long Period Grating with Mesoporous Nano-Scale Coating

Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction

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