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Based on differences in grating structure and operating principles, fiber grating sensors can be classified into three categories: FBG sensors, TFBG sensors, and Long-Period Fiber Grating
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Long-period fiber gratings (LPFGs) are efficient ways to achieve high-order core mode conversion and vortex mode conversion in few-mode
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Unlike a fiber Bragg grating, A long period fiber grating couples light from a guided mode into forward propagating cladding modes where they are lost due to absorption and scattering.
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The long-period fiber grating (LPFG) is an optical passive device, which can couple the core mode to the cladding modes transmitted in the same
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Abstract and Figures Present work deals with the analytical study of spectral and dispersion properties of long period fiber grating (LPFG) under
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A four-layer structure is then created: i) fiber core; ii) fiber cladding; iii) high-RI overlay; iv) external infinite medium (water or saline buffer for biosensing applications).
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Because of its benefits and superior flexibility, in the thousands of fields, long-period fiber gratings have been examined and detected in recent years. In this conference paper, we are
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Decades have passed since the first demonstration of a long-period fiber grating (LPFG) and its practical application for sensors, and, in this period, manufacturing techniques, sensitivity
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One type of fibre Bragg grating is the long period fibre grating (LPFG), which exhibits wider spectral responses and operates in transmission mode. It is
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Structure-Modulated Long-Period Fiber Gratings (SM-LPFGs) represent an advancement in fiber optic sensor technology, moving beyond
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Abstract This manuscript studies a method to create Long Period Fiber Gratings in optical fibers using a cost-effective 3D-printed device equipped with interchangeable masks, allowing fast
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A relatively simple and cost-effective method to realise a novel long-period fibre grating (LPFG) based on blue phase liquid crystal (BPLC) composites was proposed and experimentally
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In this work, we investigate modification of transmission spectra of long-period fiber grating structures with an acoustic shock front propagating along the fiber.
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This chapter presents a systematic review of long period fiber gratings (LPFGs) inscribed by CO2 laser irradiation. Firstly, various fabrication techniques based on CO2 laser irradiations are introduced that
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In this chapter we will make a review of the relevant aspects of LPFGs.
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We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order
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Specifically, long period gratings (LPG) have been mechanically induced in different optical fibers through a 3D printed nearly sinusoidal grooved structure. LPGs have been mechanically induced in
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Highlights • Utilizing phase-shifted long-period fiber grating (PS-LPFG) to optimize output spectral linewidth of high-power fiber laser. • A detailed design philosophy and method of PS-LPFG
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This article presents a long-period fiber-grating sensor based on a congruent quasi-helical structure (CQH-LPFG) with the two-parameter
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However, mechanical devices usually have higher requirements on environmental conditions and need to be carried out under vibration-free
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The first commercial products involving two-dimensionally periodic photonic crystals are already available in the form of photonic-crystal fibers, which use a microscale structure to confine light with
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A long-period fiber grating (LPFG) structure based on D-shaped fiber is proposed, where a graphene oxide (GO) film layer is deposited on the fiber by the dipping method to jointly construct a new
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In comparison with fibre Bragg gratings (FBGs), LPFGs offer a number of additional advantages including easy fabrication, low level of back-reflection and high temperature sensitivity.
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Among OFGs, long period fiber gratings (LPFGs) are one of the most important fiber-based sensors. They were first presented by Vengsarkar and co-workers in 1996 as band-rejection filters. Since
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A long-period fiber grating couples light from a guided mode into forward propagating cladding modes where it is lost due to absorption and scattering. The coupling from the guided mode to cladding
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In this conference paper, we are summarizing the feature, advantages, and advances in the development of LPFG''s along with their different fabrication techniques. A comparison between
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It is an optical fiber structure with the properties periodically varying along the fiber, such that the conditions for the interaction of several copropagating modes are satisfied. The period of such a
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1. Introduction Recently, long-period fiber gratings (LPFGs) are optical devices that are extensively used in the fields of structural health monitoring, biomonitoring and artificial intelligence
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Its application as a sensing element is advantageous because of the intrinsic characteristics of the fiber sensors, such as remote sensing,
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