Characteristics of dual-peak resonance in a tilted long-period fiber grating sensing film sensor

Sang, Jiangang; Gu, Zhengtian; Ling, Qiang

doi:10.1364/josab.34.002358

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…For TFGs, the modal interaction can take place between various guided modes with any azimuthal order, as the grating tilt provides the necessary azimuthal perturbation for the mode coupling. A well-established coupled mode theory is used to analyse the coupling between the modes in TLPGs and TFBGs [36,[41][42][43]. In the grating region, the core refractive index is modified as…”

Section: Modelmentioning

confidence: 99%

Bi-directional high-order orbital angular momentum mode generation using gratings in high numerical aperture fiber

Koley,

Mani Tripathi

2024

J. Opt.

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In this paper we propose a novel design and theoretically analyse it for bi-directional orbital angular momentum (OAM) mode generation in highnumerical aperture (NA) optical fiber using combination of long period grating, short-period (Bragg) grating and a three port optical circulator. The proposed design consisting only standard fiber gratings rather than specially designed fibers, like ring-shaped fiber or other types of fiber, makings our model relatively simple. The full-vector true-mode analysis has been used to study the modal characteristics of the supported modes in the high-NA fiber. High-NA optical fiber can effectively relieve the degeneracy of the linearly polarised modes. A circularly polarised (CP) light is injected into a single mode fiber, the output end of which is axially spliced to a high NA fiber. An appropriately designed raised-cosine apodized tilted long period grating (TLPG) is used for broad bandwidth coupling of the fundamental HE11 mode to co-propagating HE21 mode. The employed TLPG converts the circularly polarised fundamental core mode (HE_x11 ± iHE_y11 ) to ±1-order OAM modes (HE_even 21 ± iHE_odd21 ). Both the CP mode andthe generated OAM pass through the circulator in the direction of port 1 to port 2. A second fiber is connected at the output of the port 2, and a tilted fiber Bragg grating (TFBG) is used to couple the forward propagating HE11 core mode with the counter-propagating HE21, EH11 and HE31 core modes. The TFBG reflected higher order (±1 and ±2) OAM modes transmit through the port 3. We have observed that the TFBG has a mode conversion efficiency of more than 95% for each mode conversion. The generated vortex beam’s topological charges have been varified using the coaxial interference method.

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Section: Modelmentioning

confidence: 99%

Bi-directional high-order orbital angular momentum mode generation using gratings in high numerical aperture fiber

Koley,

Mani Tripathi

2024

J. Opt.

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“…By immersing the microfiber in the MF, the optical polarization detection was used to track the magnetic field's direction and strength. Sang et al (2017) demonstrated an optical magnetic field sensor consists of a cladding-etched LPFG coated with MF and encapsulated in a capillary. The cladding-etched LPFG has dual dips, which move in the opposite wavelength direction with the changes of the magnetic field.…”

Section: Literature Reviewmentioning

confidence: 99%

Magnetic Field Sensor Using the Magnetic Fluid Encapsulated Long-Period Fiber Grating Inscribed in the Thin-Cladding Fiber

Wang,

He,

Yuan

et al. 2023

JOPR

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Optical magnetic field current sensors could overcome the shortcomings of traditional sensors based on electrical principles, such as large volume, insufficient sensitivity, and limitations of working environment, which can be applied to medical, military, and other fields with higher sensing requirements. We demonstrated experimentally the inscription of the long-period fiber gratings (LPFGs) in the thin-cladding fiber (TCF). The magnetic field current sensor is fabricated by encapsulating the TCF–LPFG with magnetic fluid (MF) nanoparticles. The principle of the sensor is based on the refractive index tunability of the MF with the magnetic field (current). The measurement of the external magnetic field (current) can be obtained by detecting the wavelength shift of the coated TCF–LPFG, which changes with the applied magnetic field. In the intensity range of 0 ∼ 11 mT, the experimental sensitivity of magnetic field measurement is up to −0.31 nm/mT. The proposed magnetic field current sensor has potential applications in practical measurement of magnetic field.

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Tilted long-period fiber grating strain sensor based on dual-peak resonance near PMTP

Guan

Ling

et al. 2019

Optics & Laser Technology

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Characteristics of dual-peak resonance in a tilted long-period fiber grating sensing film sensor

Cited by 7 publications

References 16 publications

Bi-directional high-order orbital angular momentum mode generation using gratings in high numerical aperture fiber

Bi-directional high-order orbital angular momentum mode generation using gratings in high numerical aperture fiber

Magnetic Field Sensor Using the Magnetic Fluid Encapsulated Long-Period Fiber Grating Inscribed in the Thin-Cladding Fiber

Tilted long-period fiber grating strain sensor based on dual-peak resonance near PMTP

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