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Because of the high index difference between the outer cladding and air most of the back reflected light couples into the outer cladding modes.
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The outer cladding of the 6×8-meter water tank that houses the LUX detector.
The idea is to make the inner cladding be collapsed before the outer cladding is ballooned during the LOCA transient.
The outer cladding is made of glass of a different chemical formulation and has a lower optical index of refraction.
From the concern of the inner cladding's bowing during irradiation, it was suggested that the outer cladding would grow more than the inner one by applying different microstructures to the inner and outer cladding tubes.
Thus, the dispersion profile of the double cladding DF-PCFs is insensitive to the deformation of air-holes in the outer cladding.
Under the framework, the critical issues such as the outer cladding thickness and the growth difference of the inner and outer cladding tubes are dealt with in this paper.
The effective single-mode operation of the proposed device is achieved through appropriate tailoring of the outer cladding layers.
The inner cladding also suppresses the higher order modes and allows large air filling fraction in the outer cladding while the proposed fiber remains SPSM, which significantly reduces the mode effective area and the confinement loss.
In PCFs of the second type, the solid core is surrounded by a dual-scale cladding, where the inner part comprises air-holes of different diameters, while the outer cladding consists of large-diameter air-holes.
The stack-and-draw process makes it easy to tailor the outer cladding so that a large numerical aperture can be reached.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com