Reflections near 1030nm from 1540nm fibre Bragg gratings: Evidence of a complex refractive index structure

2005 ◽  
Vol 256 (4-6) ◽  
pp. 310-318 ◽  
Author(s):  
C.M. Rollinson ◽  
S.A. Wade ◽  
N.M. Dragomir ◽  
G.W. Baxter ◽  
S.F. Collins ◽  
...  
Keyword(s):  
Refractive Index ◽  
Complex Refractive Index ◽  
Bragg Gratings ◽  
Index Structure ◽  
Fibre Bragg Gratings

scholarly journals Dispersion in a Gas Filled Hollow Core Photonic Crystal Fiber

2014 ◽  
Vol 11 (3) ◽  
pp. 1250-1256
Author(s):  
Baghdad Science Journal
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Optical Fibers ◽  
Complex Refractive Index ◽  
Index Structure ◽  
Hollow Core ◽  
Dispersion Properties ◽  
Crystal Fiber ◽  
Crystal Fibers

Hollow core photonic bandgap fibers provide a new geometry for the realization and enhancement of many nonlinear optical effects. Such fibers offer novel guidance and dispersion properties that provide an advantage over conventional fibers for various applications. Dispersion, which expresses the variation with wavelength of the guided-mode group velocity, is one of the most important properties of optical fibers. Photonic crystal fibers (PCFs) offer much larger flexibility than conventional fibers with respect to tailoring of the dispersion curve. This is partly due to the large refractive-index contrast available in the silica/air microstructures, and partly due to the possibility of making complex refractive-index structure over the fiber cross section. In this paper the fundamental physical mechanism has been discussed determining the dispersion properties of PCFs, and the dispersion in a gas filled hollow core photonic crystal fiber has been calculated. We calculate the dispersion of air filled hollow core photonic crystal fiber, also calculate the dispersion of N2 gas filled hollow core photonic crystal fiber and finally we calculate the dispersion of He gas filled hollow core photonic crystal fiber.

Experimental and numerical study on refractive index sensors based on fibre Bragg gratings inscribed in multimode fibre

2018 ◽  
Vol 29 (2) ◽  
pp. 025102 ◽  
Author(s):  
Jean Filipe Kuhne ◽  
Ana Maria Rocha ◽  
Valmir de Oliveira ◽  
Hypolito José Kalinowski ◽  
Ricardo Canute Kamikawachi
Keyword(s):  
Refractive Index ◽  
Numerical Study ◽  
Bragg Gratings ◽  
Refractive Index Sensors ◽  
Fibre Bragg Gratings

scholarly journals Laser nano-filament explosion for enabling open-grating sensing in optical fibre

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Keivan Mahmoud Aghdami ◽  
Abdullah Rahnama ◽  
Erden Ertorer ◽  
Peter R. Herman
Keyword(s):  
Refractive Index ◽  
Optical Fibre ◽  
Chemical Etching ◽  
Pulsed Laser ◽  
Bragg Gratings ◽  
High Refractive Index ◽  
Refractive Index Sensing ◽  
Index Contrast ◽  
Fibre Bragg Gratings ◽  
Processing Steps

AbstractEmbedding strong photonic stopbands into traditional optical fibre that can directly access and sense the outside environment is challenging, relying on tedious nano-processing steps that result in fragile thinned fibre. Ultrashort-pulsed laser filaments have recently provided a non-contact means of opening high-aspect ratio nano-holes inside of bulk transparent glasses. This method has been extended here to optical fibre, resulting in high density arrays of laser filamented holes penetrating transversely through the silica cladding and guiding core to provide high refractive index contrast Bragg gratings in the telecommunication band. The point‐by‐point fabrication was combined with post-chemical etching to engineer strong photonic stopbands directly inside of the compact and flexible fibre. Fibre Bragg gratings with sharply resolved π-shifts are presented for high resolution refractive index sensing from $${n}_{{{{{{\rm{H}}}}}}}$$ n H  = 1 to 1.67 as the nano-holes were readily wetted and filled with various solvents and oils through an intact fibre cladding.

Fibre Bragg Gratings in Harsh and Space Environments: Principles and applications

2019 ◽  
Author(s):  
Brahim Aissa ◽  
Emile I. Haddad ◽  
Roman V. Kruzelecky ◽  
Wes R. Jamroz
Keyword(s):  
Bragg Gratings ◽  
Space Environments ◽  
Fibre Bragg Gratings
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