Non-uniform-tilt-modulated fiber Bragg grating for temperature-immune micro-displacement measurement

Guo, Tuan; Chen, Chengkun; Albert, Jacques

doi:10.1088/0957-0233/20/3/034007

Cited by 23 publications

(6 citation statements)

References 18 publications

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“…Many groups have therefore endeavored to enhance the asymmetry of the refractive index profile and expand the Bragg coupling to odd symmetric LP 1n modes in the cladding, for example, through tilting of the grating planes [11,12], type II laser writing of gratings at the core-cladding interface [13,14], and transversely offsetting the refractive index modification by focusing outside the axial center of the waveguide in point-bypoint writing [15]. In this way, tilted FBGs have been used for wideband gain flattening of an erbium fiber amplifier [16], refractometry of liquids outside of the cladding [10], temperatureinsensitive gauging of non-uniform axial strain [17] and acceleration sensing [18].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser writing of optical edge filters in fused silica optical waveguides

Grenier¹,

Fernandes²,

Herman³

2013

Opt. Express

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The positional alignment of femtosecond laser written Bragg grating waveguides within standard and coreless optical fiber has been exploited to vary symmetry and open strong optical coupling to a high density of asymmetric cladding modes. This coupling was further intensified with tight focusing of the laser pulses through an oil-immersion lens to control mode size against an asymmetric refractive index profile. By extending this Bragg grating waveguide writing into bulk fused silica glass, strong coupling to a continuum of radiation-like modes facilitated a significant broadening to over hundreds of nanometers bandwidth that blended into the narrow Bragg resonance to form into a strongly isolating (43 dB) optical edge filter. This Bragg resonance defined exceptionally steep edge slopes of 136 dB/nm and 185 dB/nm for unpolarized and linearly polarized light, respectively, that were tunable through the 1450 nm to 1550 nm telecommunication band.

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Section: Introductionmentioning

confidence: 99%

Femtosecond laser writing of optical edge filters in fused silica optical waveguides

Grenier¹,

Fernandes²,

Herman³

2013

Opt. Express

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“…Thermoelastic effect will change the grating period as measured along the axis of the fiber (𝛬 𝑔 ), while thermo-optic effect will change the effective index of core and cladding, resulting in the change of wavelength that make up the envelop. When the temperature changes, the wavelength change of cladding mode ν is shown in formula (2) [8,9] .…”

Section: Effect Of Temperature Change On the Spectrum Of Tfbgmentioning

confidence: 99%

High sensitive TFBG sensing demodulation scheme based on microwave photonic interrogation

Hu²,

Gu³

et al. 2023

Advanced Optical Manufacturing Technologies and Applications 2022; And 2nd International Forum of Young Scientists on Advanced

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In this paper, we propose and demonstrate a novel Tilted Fiber Bragg grating (TFBG) sensing demodulation scheme based on microwave photonic technique. In the proposed approach, the optical power spectrum from BBS (Broadband source) is shaped by a TFBG and then sent to a dispersive element to perform the linear wavelength-to-time mapping. A nonuniform microwave photonic filter with the center frequency depending on the shaped optical spectrum is obtained at the output of a high-speed photodetector. The central frequency and the envelope of the generated microwave photonic filter will shift according to the change of environment. Theory and a proof-of-principle experiment are implemented to verify the proposed approach.

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“…Examples of applications in mechanical sensing include optical fiber accelerometers [ 9 ], cantilever-based micro-displacement sensors [ 10 ], and even three-dimensional shape sensors based on orthogonal TFBGs [ 4 ]. However, optical fiber biosensing is the field where TFBGs showcase their highest potential [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Cladding Diameter for Refractive Index Sensing in Tilted Fiber Bragg Gratings

Korganbayev

Sypabekova

Amantayeva

et al. 2022

Sensors

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This work presents an experimental investigation of the effect of chemical etching on the refractive index (RI) sensitivity of tilted fiber Bragg gratings (TFBGs). Hydrofluoric acid (HF) was used stepwise in order to reduce the optical fiber diameter from 125 µm to 13 µm. After each etching step, TFBGs were calibrated using two ranges of RI solutions: the first one with high RI variation (from 1.33679 RIU to 1.37078 RIU) and the second with low RI variation (from 1.34722 RIU to 1.34873 RIU). RI sensitivity was analyzed in terms of wavelength shift and intensity change of the grating resonances. The highest amplitude sensitivities obtained are 1008 dB/RIU for the high RI range and 8160 dB/RIU for the low RI range, corresponding to the unetched TFBG. The highest wavelength sensitivities are 38.8 nm/RIU for a fiber diameter of 100 µm for the high RI range, and 156 nm/RIU for a diameter of 40 µm for the small RI range. In addition, the effect of the etching process on the spectral intensity of the cladding modes, their wavelength separation and sensor linearity (R2) were studied as well. As a result, an optimization of the etching process is provided, so that the best trade-off between sensitivity, intensity level, and fiber thickness can be obtained.

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Non-uniform-tilt-modulated fiber Bragg grating for temperature-immune micro-displacement measurement

Cited by 23 publications

References 18 publications

Femtosecond laser writing of optical edge filters in fused silica optical waveguides

Femtosecond laser writing of optical edge filters in fused silica optical waveguides

High sensitive TFBG sensing demodulation scheme based on microwave photonic interrogation

Optimization of Cladding Diameter for Refractive Index Sensing in Tilted Fiber Bragg Gratings

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