In-Line Mach-Zehnder Interferometer With D-Shaped Fiber Grating for Temperature-Discriminated Directional Curvature Measurement

Jiang, Biqiang; Bai, Zhiyong; Wang, Changle; Zhao, Yunhe; Zhao, Jianlin; Zhang, Lin; Zhou, Kaiming

doi:10.1109/jlt.2017.2776297

Cited by 51 publications

(18 citation statements)

References 22 publications

(29 reference statements)

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“…Jiang et al demonstrated a sensor for simultaneous measurement of temperature and directional curvature based on the composition of an MZI and an FBG inscribed in a segment of the D‐shaped optical fiber by a UV laser. And two ends of the D‐shaped optical fiber were spliced with SMFs with core‐offset, which were used as the beam splitter and beam combiner.…”

Section: D‐shaped Fiber Grating Sensorsmentioning

confidence: 99%

Novel Fiber Grating for Sensing Applications

Zhang

et al. 2019

Physica Status Solidi (a)

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This review covers some kinds of novel fiber grating and their applications in sensing fields. According to the fiber structures, these novel fiber grating sensors are divided into five types: single mode fiber grating sensors, few-mode fiber grating sensors, multi-core fiber grating sensors, photonic crystal fiber grating sensors, and D-shaped fiber grating sensors. For each kind of fiber grating sensor, both long period fiber grating sensors and fiber Bragg grating sensors are introduced separately, along with their structures, sensing applications, corresponding sensing characteristics, and the advantages and disadvantages in sensing applications.

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Section: D‐shaped Fiber Grating Sensorsmentioning

confidence: 99%

Novel Fiber Grating for Sensing Applications

Zhang

et al. 2019

Physica Status Solidi (a)

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“…Here, we inserted a small segment of asymmetrical D-shaped fiber to construct the MZI, as shown in Fig. 2(a), which promises sensitive wavelength responses and broader tuning on the mechanical strain, bending and temperature [20]. The inset shows the cross-section of the employed D-shaped fiber with the asymmetric structure, the fiber core with a diameter of 9.57 μm is placed at a distance of 3.55 μm from the flat surface.…”

Section: Device Fabricationmentioning

confidence: 99%

“…The prepared MZI structure was firstly hydrogenated for photosensitivity enhancement, and then a FBG was UV-inscribed into the D-shaped fiber by using the scanning phase-mask technique and a frequency-doubled continuous wave argon-ion laser [20], [21]. During the inscription, the flat surface of D-shaped fiber is rotated to face the phase mask and UV-laser, avoiding the asymmetric edge diffraction for an improvement of the inscription efficiency.…”

Section: Device Fabricationmentioning

confidence: 99%

“…3, with the heating, twisting, especially bending of the D-shaped section of the device, the total phase shift ϕ will be modulated as well as the transmission dips of MZI and FBG wavelengths. Drawing on the bending measurement principles from our previous work [20], the shift of resonant dips of the MZI linearly depends on the curvature change C as…”

Section: Experimental Demonstration and Tuning Of The Fano-like Resonmentioning

confidence: 99%

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Fano-Like Resonance in an All-in-Fiber Structure

Jiang

Gan

et al. 2019

IEEE Photonics J.

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We achieve Fano-like resonances in an all-in-fiber structure embedded with an in-line Mach-Zehnder interferometer (MZI). A fiber Bragg grating is inserted into MZI's one arm to form a resonance, which functions as the discrete state of the Fano-like resonance to couple with the continuum propagating mode of MZI in the fiber core. A theoretical model predicts the controllable resonance lineshape by changing the phase difference between the MZI's two interference pathways. Fano-like resonances with an extinction ratio over 20 dB are experimentally observed, which are reliably tuned into Lorentzian and electromagnetically induced transparency-like resonances by versatile methods. The realization of Fano-like resonances with broad tunability in this all-in-fiber structure holds potentials in fiber-based applications of sensing, signal processing and nonlinear optics.

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“…However, nontrivial modification and precise alignment of grating writing tools are required in such processing such structures. Finally, several other vector bending schemes have also been investigated with FBGs in and eccentric-core [31] and D-shaped fibers [32], for which low loss splicing to standard single mode fiber (SMF) is difficult.…”

Section: Introductionmentioning

confidence: 99%

Symmetry selective cladding modes coupling in ultrafast-written fiber Bragg gratings in two-mode fiber

Feng¹,

Albert²,

Jiang³

et al. 2019

Opt. Express

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The lower order cladding mode resonances of a fiber Bragg grating (FBG) are sensitive to fiber bending but their spectral density makes their response to bending very complex. In this work we present a simple method to reduce and control the number of low order cladding mode resonances via FBGs written in a two-mode fiber (TMF) with an ultrafast laser. Owing to the larger core size of the TMF, a slight break of the cylindrical asymmetry of the grating patterns can be induced when using femtosecond side-irradiation with a small change in the writing condition. This allows us to control the mode families coupled by the grating, and in particular to those modes that have positive or negative bending responses along certain bend directions. Experimental results demonstrate that several lower-order neighboring-cladding mode pairs coupled by the asymmetric TMFBG have antagonistic loss responses (by several dB) for different bending directions, thus allowing full 2D bending measurements with many applications in shape sensing. Finally, this device has similar advantages as tilted FBGs, i.e. temperature de-correlation and the possibility of increasing the signal to noise ratio by averaging simultaneous measurements on several pairs of resonances.

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In-Line Mach-Zehnder Interferometer With D-Shaped Fiber Grating for Temperature-Discriminated Directional Curvature Measurement

Cited by 51 publications

References 22 publications

Novel Fiber Grating for Sensing Applications

Novel Fiber Grating for Sensing Applications

Fano-Like Resonance in an All-in-Fiber Structure

Symmetry selective cladding modes coupling in ultrafast-written fiber Bragg gratings in two-mode fiber

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