Microstructured Polymer Optical Fibres

Large, M. I.; Poladian, L.; Barton, G.W.; Eijkelenborg, Martijn A. van

doi:10.1007/978-0-387-68617-2

Cited by 120 publications

(133 citation statements)

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“…This shrinking is an irreversible process [22]. Temperature increases below the threshold can only result in a reversible decrease of the refractive index due to the negative thermo-optic coefficient (TOC, -1.1×10 -4 /°C) of PMMA [24], which can be reversed to the original state once the temperature decreases [22]. Our experiments show that the blue shift of the resonance wavelengths, as shown in Fig.1 (b), was indeed reversible once the writing was stopped.…”

Section: Experiments 21 Pofs and Fbgs Writingmentioning

confidence: 99%

“…Polymer optical FBGs have shown great potential for sensor applications to sense for example temperature and strain with higher sensitivity and wider tunability than its silica counterpart [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Those advantages are due to the lower Young's modulus and higher thermo-optic coefficient of POFs [23,24]. In addition, polymers are clinically acceptable, which along with the flexible, non-brittle nature of the fibers makes these gratings an important candidate for in-vivo biosensing applications [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Improved thermal and strain performance of annealed polymer optical fiber Bragg gratings

Yuan

Stefani

Bache

et al. 2011

Optics Communications

141

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Abstract:We report on a detailed study of the inscription and characterization of fiber Bragg gratings (FBGs) in commercial step index polymer optical fibers (POFs). Through the growth dynamics of the gratings, we identify the effect of UV-induced heating during the grating inscription. We found that FBGs in annealed commercial POFs can offer more stable short-term performance at both higher temperature and larger strain. Furthermore, the FBGs' operational temperature and strain range without hysteresis was extended by the annealing process. We identified long-term stability problem of even the annealed POF FBGs. [7][8][9][10][11][12][13][14][15][16]. 325nm has been employed as a mainstream wavelength for writing grating in PMMA POFs [1][2][3][4][5][8][9][10][11][12][13][14][15]. Other wavelength such as 355nm obtained from a frequency-tripled Nd:YAG laser has been used to write grating in CYTOP fiber developed by Asahi Glass Co. and Keio University [15,16]. On the other hand, 800nm femtosecond pulses from Ti:Sapphire laser or its double frequency was mainly used for point by point direct writing [6] or grating writing with a phasemask [7]. However, the mechanism of index change does not appear to be fully understood [5,13,[18][19][20]. It is believed that more than one process is involved in the photo-induced refractive index changes and hence in the grating formation dynamics [18][19][20]. The widely accepted point is that the principle mechanism of index change is an increase due to the photo-induced polymerization of the unreacted monomers [5,[18][19][20], while laser-induced heating in the irradiated region during the inscription may also contribute to the index change [5]. Previous reports indicated that annealing of the POF before FBG inscription can relieve the frozen-in stress induced by the fiber drawing process [21] and increase the linear operation temperature range of FBGs [22]. However, the effect of annealing on the strain sensitivity performance was not yet considered. Polymer optical FBGs have shown great potential for sensor applications to sense for example temperature and strain with higher sensitivity and wider tunability than its silica counterpart [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Those advantages are due to the lower Young's modulus and higher thermo-optic coefficient of POFs [23,24]. In addition, polymers are clinically

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Section: Experiments 21 Pofs and Fbgs Writingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved thermal and strain performance of annealed polymer optical fiber Bragg gratings

Yuan

Stefani

Bache

et al. 2011

Optics Communications

141

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“…On the other hand, there is a general lack of quality single-mode (SM) polymer fibers required for high-precision sensing applications. Experimental SM POFs are being produced by various research groups with the vast majority of them relying on a microstructured fiber architecture [13]. The most common method for preparing microstructured POFs (mPOFs) is by drilling a periodic array of air holes of desired geometry along the axis of a bulk polymer rod that is subsequently drawn into the fiber.…”

Section: Fiber Samplesmentioning

confidence: 99%

“…Determination of alignment degree from fiber drawing force is not straightforward because it is sensitive to various drawing conditions and their fluctuations. The situation can be even more complicated if a multi-step drawing procedure is employed [13], when a certain level of molecular alignment is introduced already during the cane drawing. In order to get a more objective measure of the fibers' initial degree of molecular alignment, we use the fiber length relaxation ratio .…”

Section: Annealing Dynamics and Molecular Alignmentmentioning

confidence: 99%

Molecular alignment relaxation in polymer optical fibers for sensing applications

Stajanča

Çetinkaya

Schukar

et al. 2016

Optical Fiber Technology

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A systematic study of annealing behavior of drawn PMMA fibers was performed. Annealing dynamics were investigated under different environmental conditions by fiber longitudinal shrinkage monitoring. The shrinkage process was found to follow a stretched exponential decay function revealing the heterogeneous nature of the underlying molecular dynamics. The complex dependence of the fiber shrinkage on initial degree of molecular alignment in the fiber, annealing time and temperature was investigated and interpreted. Moreover, humidity was shown to have a profound effect on the annealing process, which was not recognized previously. Annealing was also shown to have considerable effect on the fiber mechanical properties associated with the relaxation of molecular alignment in the fiber. The consequences of fiber annealing for the climatic stability of certain polymer optical fiber-based sensors are discussed, emphasizing the importance of fiber controlled pre-annealing with respect to the foreseeable operating conditions.

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“…In general, multiple microscopic air-holes lattice runs down longitudinally along the length of the optical fibre with different microstructure pattern. A novel waveguides property can be achieved by designing various air hole structures, size, shape and distribution of the holes, which may not be readily achieved in conventional optical fibres [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Role of Flexible Macro Fibre Composite (MFC) Actuator on Bragg Wavelength Tuning in Microstructure Polymer Optical Fibre Long Period Grating for Strain Sensing Applications*

Dikshit¹,

Raj²

2013

JST

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The microstructure polymer optical fibre (mPOF) inscribed long period grating (LPG) offers a wide field of application in strain sensors arena within the materials elastic limit. Flexible innovative macro fibre composite (MFC) actuator generates electromechanical force under DC driving voltage. We propose a novel method for Bragg wavelength blue shifting through stretch tuning of mPOF LPG in axial direction under applied DC voltage on attached MFC with LPG. The grating period of mPOF LPG changes refractive index and causes blue shift of Bragg grating fibre wavelength. The shifting governs on the values of generated electromechanically strain transfer from flexible MFC to mPOF LPG and they have potential applications in strain sensor.

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Microstructured Polymer Optical Fibres

Cited by 120 publications

References 0 publications

Improved thermal and strain performance of annealed polymer optical fiber Bragg gratings

Improved thermal and strain performance of annealed polymer optical fiber Bragg gratings

Molecular alignment relaxation in polymer optical fibers for sensing applications

Role of Flexible Macro Fibre Composite (MFC) Actuator on Bragg Wavelength Tuning in Microstructure Polymer Optical Fibre Long Period Grating for Strain Sensing Applications*

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