Demodulation technique for weakly tilted fiber Bragg grating refractometer

Caucheteur, Christophe; Mégret, Patrice

doi:10.1109/lpt.2005.859411

Cited by 128 publications

(65 citation statements)

References 6 publications

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“…In small angle (<10°) TFGs, the propagated light in the fiber core region can be coupled into both copropagating core mode and counter-propagating cladding modes in specific wavelengths, resulting in multiple resonances at the transmission spectrum. Due to this feature, tilted fiber Bragg gratings can be used as gain flattened erbium fiber amplifiers [9], add-drop filters [10,11], modal power distribution measurers [12] and refractometers [13,14].…”

Section: Structure and Characteristic Of Tfgmentioning

confidence: 99%

A fiber-compatible spectrally encoded imaging system using a 45° tilted fiber grating

Wang

Yan

et al. 2016

SPIE Proceedings

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We propose and demonstrate, for the first time to our best knowledge, the use of a 45° tilted fiber grating (TFG) as an infiber lateral diffraction element in an efficient and fiber-compatible spectrally encoded imaging (SEI) system. Under proper polarization control, the TFG has significantly enhanced diffraction efficiency (93.5%) due to strong tilted reflection. Our conceptually new fiber-topics-based design eliminates the need for bulky and lossy free-space diffraction gratings, significantly reduces the volume and cost of the imaging system, improves energy efficiency, and increases system stability. As a proof-of-principle experiment, we use the proposed system to perform an one dimensional (1D) line scan imaging of a customer-designed three-slot sample and the results show that the constructed image matches well with the actual sample. The angular dispersion of the 45° TFG is measured to be 0.054°/nm and the lateral resolution of the SEI system is measured to be 28 μm in our experiment.

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Section: Structure and Characteristic Of Tfgmentioning

confidence: 99%

A fiber-compatible spectrally encoded imaging system using a 45° tilted fiber grating

Wang

Yan

et al. 2016

SPIE Proceedings

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“…The first method relies on the monitoring of the area delimited by the cladding mode resonance spectrum, via a computation of the upper and lower envelopes. For increasing SRI values, the area is decreasing, as resonances gradually disappear when the SRI reaches the cut-off points of each cladding mode [4,5]. In practice, the normalized area is used, i.e.…”

Section: Bare Tfbgsmentioning

confidence: 99%

“…Also, cladding mode resonances are intrinsically sensitive to surrounding refractive index changes and bending, which multiplies the sensing modalities compared to uniform FBGs. TFBGs have been demonstrated to be accurate refractometers [4][5][6], bending sensor [7,8] and vibration sensors [9,10]. A third benefit of using TFBGs is that the tilt angle breaks the cylindrical symmetry of the coupling process relative to the state of polarization (SOP) of the guided core light.…”

Section: Introductionmentioning

confidence: 99%

Light Polarization-Assisted Sensing with Tilted Fiber Bragg Gratings

Caucheteur¹

2013

TOOPTSJ

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Tilted fiber Bragg gratings (TFBGs) are short-period gratings for which the refractive index modulation of the fiber core is angled by a few degrees with respect to the perpendicular to the propagation axis. They induce two kinds of light coupling: the self-backward coupling of the core mode at the Bragg wavelength and the backward coupling between the core mode and several tens of cladding modes, each with its own effective refractive index and mode field shape. The information contained in their spectral content is such that they inherently provide novel sensing modalities and improve the sensitivity in comparison to uniform fiber Bragg gratings. In particular, TFBGs are intrinsically temperatureinsensitive by referencing spectral measurements to the wavelength and power level of the core mode resonance. As the tilt angle breaks the circular symmetry of the optical fiber cross-section, TFBGs are strongly dependent on light polarization effects, which can be advantageously used when they are coated with nanoscale metal coatings or thin films. In this review, we report the latest achievements obtained with bare and coated TFBGs used for high-resolution refractometry and biochemical sensing through surface Plasmon wave generation.

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“…Эта особенность позволяет использо-вать НВБР при изготовлении сглаживающего эрбиевого усилителя [6], оптического анализатора спектра [7], фильтра ввода-вывода [8]. Другая особенность НВБР -они чувствительны к показателю преломления внешней среды, что позволяет использовать их при изготовле-нии рефрактометров [9][10][11] и измерителей концентра-ции [12,13]. НВБР, имеющие относительно большой угол наклона, обладают высокой чувствительностью к состоянию поляризации проходящего света.…”

Section: Introductionunclassified