Current sensing using circularly birefringent twisted solid-core photonic crystal fiber

Beravat, R.; Wong, G. K. L.; Xi, X. M.; Frosz, Michael H.; Russell, P. St. J.

doi:10.1364/ol.41.001672

Cited by 42 publications

(24 citation statements)

References 18 publications

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“…For fibres made from fused silica, numerical modelling shows that B C reaches a maximum for a shape parameter d / Λ of 0.37 and a scale parameter Λ /λ of 1.51 (figure 9). This has recently been confirmed experimentally by testing a range of different structures [26]. The physical reason for this behaviour lies in the modal field structure.…”

Section: Optical Activity In Twisted Photonic Crystal Fibrementioning

confidence: 67%

Helically twisted photonic crystal fibres

Russell¹,

Beravat²,

Wong³

2017

Phil. Trans. R. Soc. A.

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117

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Recent theoretical and experimental work on helically twisted photonic crystal fibres (PCFs) is reviewed. Helical Bloch theory is introduced, including a new formalism based on the tight-binding approximation. It is used to explore and explain a variety of unusual effects that appear in a range of different twisted PCFs, including fibres with a single core and fibres with N cores arranged in a ring around the fibre axis. We discuss a new kind of birefringence that causes the propagation constants of left- and right-spinning optical vortices to be non-degenerate for the same order of orbital angular momentum (OAM). Topological effects, arising from the twisted periodic ‘space’, cause light to spiral around the fibre axis, with fascinating consequences, including the appearance of dips in the transmission spectrum and low loss guidance in coreless PCF. Discussing twisted fibres with a single off-axis core, we report that optical activity in a PCF is opposite in sign to that seen in a step-index fibre. Fabrication techniques are briefly described and emerging applications reviewed. The analytical results of helical Bloch theory are verified by an extensive series of ‘numerical experiments’ based on finite-element solutions of Maxwell's equations in a helicoidal frame.This article is part of the themed issue ‘Optical orbital angular momentum’.

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Section: Optical Activity In Twisted Photonic Crystal Fibrementioning

confidence: 67%

Helically twisted photonic crystal fibres

Russell¹,

Beravat²,

Wong³

2017

Phil. Trans. R. Soc. A.

Self Cite

117

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“…Chiral fibers with cores have been studied since the 1980s, for example, in connection with circular birefringence ( 3 , 4 ), current sensing ( 5 , 6 ), and elimination of higher-order modes in fiber lasers using helical off-axis cores ( 7 , 8 ). Twisted multicore PCFs have been shown to support helical Bloch waves and to exhibit orbital angular momentum (OAM) birefringence ( 9 ).…”

Section: Introductionmentioning

confidence: 99%

Twist-induced guidance in coreless photonic crystal fiber: A helical channel for light

et al. 2016

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“…These fibres preserve first order of orbital angular momentum (OAM) modes and also have twist sensitive dips in their transmission spectrum [122]. These features in helical PCFs have been recently explored for mechanical strain, twist and electrical current sensing [123,124].…”

Section: Many Unique Characteristics Of Pcfs Over Conventional Fibresmentioning

confidence: 99%

Recent developments in fibre optic shape sensing

et al. 2018

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This paper presents a comprehensive critical review of technologies used in the development of fibre optic shape sensors (FOSSs). Their operation is based on multi-dimensional bend measurements using a series of fibre optic sensors. Optical fibre sensors have experienced tremendous growth from simple bend sensors in 1980s to full three-dimensional FOSSs using multicore fibres in recent years. Following a short review of conventional contact-based shape sensor technologies, the evolution trend and sensing principles of FOSSs are presented. This paper identifies the major optical fibre technologies used for shape sensing and provides an account of the challenges and emerging applications of FOSSs in various industries such as medical robotics, industrial robotics, aerospace and mining industry.

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Current sensing using circularly birefringent twisted solid-core photonic crystal fiber

Cited by 42 publications

References 18 publications

Helically twisted photonic crystal fibres

Helically twisted photonic crystal fibres

Twist-induced guidance in coreless photonic crystal fiber: A helical channel for light

Recent developments in fibre optic shape sensing

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