High performance bandpass filters based on electric arc-induced π-shifted long-period fibre gratings

Humbert, Georges; Malki, Abdelrafik

doi:10.1049/el:20030971

Cited by 33 publications

(21 citation statements)

References 6 publications

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“…PS-LPFGs can be produced by changing the grating period at specific locations, for instance by creating a gap L p between two grating periods would result in a phase-shift ΔΦ = 2πL p /Λ. A L p = Λ/2 in the middle of the grating would result in a π-shifted LPFG which is characterized by a bandpass filter (one peak in-between two dips) centered at each resonance wavelength of the standard LPFG [17]. As mentioned above, if the fiber is cleaved at a distance of Λ/4 from the grating, Fresnel reflection would give rise to a π-shifted LPFG working in reflection.…”

Section: Theorymentioning

confidence: 99%

Cryogenic Temperature Response of Reflection-Based Phase-Shifted Long-Period Fiber Gratings

Martins

Caldas

Teixeira

et al. 2015

J. Lightwave Technol.

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In this study, we investigated the temperature behavior of phase-shifted long-period fiber gratings (PS-LPFGs) inscribed in two types of optical fiber: B/Ge and SMF28. The experiments were carried out from 5 to 305 K using a superconducting quantum interference device magnetometer. The average temperature sensitivity obtained of −0.43 nm/K for PS-LPFGs inscribed in the B/Ge fiber is one order of magnitude larger than for PS-LPFGs inscribed in the SMF28 fiber, in the 60-240 K range. Values ranging from −0.08 nm/K up to 0.2 nm/K were obtained in the 5-35 K temperature range, which are considerably better than previous results achieved for metal-coated FBGs and also for LPFGs inscribed in a similar B/Ge codoped fiber. Nevertheless, further work is required in order to correctly address sensor reliability. Index Terms-Cryogenic temperatures, long-period fiber grating, optical fiber sensor. I. INTRODUCTION S YSTEMS operating at cryogenic temperatures are becoming increasingly important in the energy sector, transportation, and medicine technology. Cryogenic fuels such as liquid hydrogen (also employed in aerospace vehicles), oxygen and liquefied natural gas are often considered as major energy alternatives to fossil fuels. To ensure the safe storage, transfer and dispensing of liquefied fuels, highly sensitive and reliable Manuscript

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Section: Theorymentioning

confidence: 99%

Cryogenic Temperature Response of Reflection-Based Phase-Shifted Long-Period Fiber Gratings

Martins

Caldas

Teixeira

et al. 2015

J. Lightwave Technol.

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“…Both techniques allow the inscription of the gratings without the need hydrogen-loaded or Ge-doped core fibres and are more flexible than the UV technique since it is not required the fabrication of a specific amplitude mask for each desired resonance wavelength (Humbert & Malki, 2003). The first results of the CO 2 laser application in the fabrication of LPG on fiber optics were published in 1998 (Davis et al, 1998;Akiyama et al, 1998;Liu et al, 2011).…”

Section: Fabrication Techniquesmentioning

confidence: 99%

Fibre Sensing System Based on Long-Period Gratings for Monitoring Aqueous Environments

Silva¹,

Coelho²,

Caldas³

et al. 2012

Fiber Optic Sensors

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“…In optics communications they can perform optical filtering in Er/Yb fiber lasers, gain equalization in EDFAs [26] and perform as bandpass filters in CWDM applications [27]. Downloaded by [York University Libraries] at 23:05 17 November 2014…”

Section: Introductionmentioning

confidence: 99%

Arc-Induced Long-Period Gratings

Rego¹,

Marques²,

Santos³

et al. 2005

Fiber and Integrated Optics

100

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The electric arc technique allows the inscription of long-period gratings (LPGs) virtually in all types of fibers, including non-photosensitive fibers, the case of non-Gedoped photonic crystal fibers being of particular interest. LPGs written in standard fibers using this technique have shown a high thermal stability. Also, the resistance to γ -radiation of LPGs arc-induced in pure-silica-core fibers is being assessed and the achieved results are very promising. We have also demonstrated that the combination of arc-induced LPGs and UV-induced fiber Bragg gratings (FBGs) leads to sampled FBGs that are able to address sensing functionalities with enhanced performance. Therefore, as a result of their properties, gratings induced by arc-discharges can find a wide range of applications in optical communications as well as in fiber sensing.

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High performance bandpass filters based on electric arc-induced π-shifted long-period fibre gratings

Cited by 33 publications

References 6 publications

Cryogenic Temperature Response of Reflection-Based Phase-Shifted Long-Period Fiber Gratings

Cryogenic Temperature Response of Reflection-Based Phase-Shifted Long-Period Fiber Gratings

Fibre Sensing System Based on Long-Period Gratings for Monitoring Aqueous Environments

Arc-Induced Long-Period Gratings

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