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Journal ArticleDOI

Compact fiber-optic curvature sensor based on super-mode interference in a seven-core fiber.

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TLDR
A compact, low loss, and highly sensitive optical fiber curvature sensor is presented, which allows for using either visibility or spectral shift for sensor interrogation when the device is bent.
Abstract
A compact, low loss, and highly sensitive optical fiber curvature sensor is presented. The device consists of a few-millimeter-long piece of seven-core fiber spliced between two single-mode fibers. When the optical fiber device is kept straight, a pronounced interference pattern appears in the transmission spectrum. However, when the device is bent, a spectral shift of the interference pattern is produced, and the visibility of the interference notches changes. This allows for using either visibility or spectral shift for sensor interrogation. The dynamic range of the device can be tailored through the proper selection of the length of the seven-core fiber. The effects of temperature and refractive index of the external medium on the response of the curvature sensor are also discussed. Linear sensitivity of about 3000  nm/mm−1 for bending was observed experimentally.

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Citations
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Journal ArticleDOI

Experimental and analytical investigation of LP01-LP11 mode interference

TL;DR: In this paper, an analytical theory of LP01-LP11 mode interference and its application in curvature measurement is introduced and verified through numerical simulation and experiments. And the applicability of the proposed formulation is further explored in terms of curvature measurements based on a few-mode multi-core fiber (FM-MCF).
Patent

Methods of and systems for materials processing using optical beams

TL;DR: In this paper, a method of materials processing using an optical beam includes: launching the optical beam into a first length of fiber having a first refractive index profile (RIP), coupling the optical beams from the first lengths of fiber into a second length of fibre having a second RIP, and/or generating an output beam, having the modified one or more beam characteristics of the original optical beam, from the second lengths of fibre.
Journal ArticleDOI

Hybrid optical fiber Fabry-Perot interferometer for nano-displacement sensing

TL;DR: In this article , a nano-displacement sensing approach based on an extrinsic hybrid fiber Fabry-Perot interferometer is proposed and demonstrated, where the lead-in fiber tip was made with a 7-cores fiber spliced to a single-mode fiber.
Patent

Multicore fiber-coupled optical probing techniques

TL;DR: In this article, an optical beam delivery device establishes an optical trap that is moveable to different optical trap locations in response to different states of applied perturbation, and a second length of fiber coupled to the first length and having confinement cores defining a second RIP.
Journal ArticleDOI

Integrated fiber-optic sensor based on inscription of FBG in seven-core fiber for curvature and temperature measurements

TL;DR: In this article , an integrated fiber-optic sensor with cross-sensitivity elimination effect is proposed and experimented for simultaneous measurements of curvature and temperature, which mainly consists of a section of seven-core fiber (SCF) that fiber Bragg gratings (FBGs) were inscribed in each fiber core by phase mask technique.
References
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Journal ArticleDOI

Curvature loss formula for optical fibers

TL;DR: In this article, the curvature loss for optical fibers with constant radius of curvature of their axes is derived by expressing the field outside of the fiber in terms of a superposition of cylindrical outgoing waves.
Journal ArticleDOI

Refractometry based on a photonic crystal fiber interferometer

TL;DR: A simple and compact modal interferometer for applications in refractometry that is highly stable over time, has low temperature sensitivity, and is suitable for measuring indices in the 1.330-1.440 range is reported.
Journal ArticleDOI

Single-Mode Fiber Refractive Index Sensor Based on Core-Offset Attenuators

TL;DR: In this paper, a fiber Michelson interferometer refractive index (RI) sensor with a single core-offset attenuator and a layer of ~ 500-nm gold coating was demonstrated.
Journal ArticleDOI

Optical bend sensor based on measurement of resonance mode splitting of long-period fiber grating

TL;DR: In this article, an effective method of realizing optical bend sensing based on the measurement of bending-curvature encoded resonance mode splitting of long-period fiber grating was proposed.
Journal ArticleDOI

Multicore fiber sensor for high-temperature applications up to 1000°C

TL;DR: A novel high temperature sensor based on customized multicore fiber (MCF) spliced between two standard single-mode fibers is proposed and experimentally demonstrated, enabling temperature measurements with high sensitivity and accuracy.
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