Long-period fiber gratings as band-rejection filters

Vengsarkar, Ashish M.; Lemaire, P. J.; Judkins, Justin B.; Bhatia, Vikram; Sipe, J. E.

doi:10.1364/ofc.1995.pd4

Cited by 334 publications

(518 citation statements)

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“…Introduction: Long period gratings (LPGs) consist of a large scale (hundred's of microns) periodic axial perturbation in the core of a single-mode optical fibre [1]. The effect of an LPG is to couple light of certain well-defined wavelengths from the core of the fibre to various cladding modes; the coupled light is then lost from the fibre, leading to a series of attenuation bands in the transmission spectrum of the device.…”

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confidence: 99%

“…A feature of LPGs is that the sensitivity to the various measurands is strongly dependent on the dispersion properties of the core and cladding [1]; consequently control of the material or waveguide dispersion can, in principle, be used to increase sensitivity to one measurand while rendering the device insensitive to another. Photonic crystal fibre (PCF) might offer great potential in this regard since the waveguiding properties can be controlled simply by adjusting the air-hole geometry.…”

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Temperature-insensitive long period grating sensors in photonic crystal fibre

Kalli²,

2004

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A Long Period Grating was fabricated in endlessly single mode photonic crystal fibre using a spatially-periodic electric arc discharge. The sensing characteristics of the grating were studied and it was found to possess an insensitivity to temperature, a bend sensitivity of 3.7 nm.m and a strain sensitivity of -2.0 pm/με.Introduction: Long period gratings (LPGs) consist of a large scale (hundred's of microns)

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Temperature-insensitive long period grating sensors in photonic crystal fibre

Kalli²,

2004

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“…hydrogen loading [7] and applying prestrain [2,[8][9][10], have been demonstrated to enhance the writing efficiency of the CO 2 -laser-induced LPFGs. As is well known, the use of hydrogen loading can enhance the photosensitivity of the Ge-doped fibers to ultra violet (UV) exposure [11]. Hydrogen loading is also found to enhance the writing efficiency of the CO 2 -laser-induced LPFGs [1,7].…”

Section: Introductionmentioning

confidence: 96%

Post-treatment techniques for enhancing mode-coupling in long period fiber gratings induced by CO2 laser

Tang

Zhao

et al. 2015

Photonic Sens

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Two promising post-treatment techniques, i.e. applying tensile strain and rising temperature, are demonstrated to enhance the mode-coupling efficiency of the CO 2 -laser-induced long period fiber gratings (LPFGs) with periodic grooves. Such two post-treatment techniques can be used to enhance the resonant attenuation of the grating to achieve a LPFG-based filter with an extremely large attenuation and to tailor the transmission spectrum of the CO 2 -laser-induced LPFG after grating fabrication.

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“…A long-period fiber grating (LPG), which couples light from a fundamental guided core mode into co-propagating cladding modes at various wavelengths, was first reported by Vengsarkar and co-workers in1996 [1]. LPGs have also been used as gain-flattening filters for erbium-doped fiber amplifiers [2], and as optical fiber polarizer's [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Optical Fiber Long Period Grating with Reduced Temperature Sensitivity

Sharma¹,

Monga²,

Sharma³

et al. 2011

IJCEE

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Abstract-In this paper we show the experimental characterization of optical fiber long period grating for the reduced temperature sensitivity by optimizing the refractiveindex profile of the host fiber. In Long Period Fiber grating the fundamental guided mode light couple with the into copropagating cladding modes at various wavelengths. The two layer Geometry later on the three layer geometry which is useful for refractive index sensing sensing application. The sensitivity of LPFGs to environmental parameters is influenced by the period of the LPFG by the order of the cladding mode to which coupling takes place and by the composition of the optical fiber. A novel method to compensate the temperature sensitivity using a boron co-doped germanosilicate core fiber is used as a host fiber. The Theoretical Characteristic Results matches with the experimental results which demonstrate that such gratings with reduced temperature coefficient retain their capability to detect strain and ambient index variations.Index Terms-LPFG, FBG, refractive index, temperature sensitivity, cladding Mode, OSA.

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Long-period fiber gratings as band-rejection filters

Cited by 334 publications

References 6 publications

Temperature-insensitive long period grating sensors in photonic crystal fibre

Temperature-insensitive long period grating sensors in photonic crystal fibre

Post-treatment techniques for enhancing mode-coupling in long period fiber gratings induced by CO2 laser

Experimental Characterization of Optical Fiber Long Period Grating with Reduced Temperature Sensitivity

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