We numerically demonstrate ultra-wideband mid-infrared supercontinuum (SC) generation in a liquid-filled arsenic–selenide circular photonic crystal fiber (C-PCF). The inner ring air-holes are filled with two different nonlinear liquids: chloroform (CHCl3) and carbon disulfide (CS2). Based on simulation results, we show that ultra-wideband SC spectra spanning from 1 to 20 μm can be achieved using only 5-mm long CHCl3 liquid filling with a pump optical pulse of 10-kW peak power at the wavelength of 2.55 μm. In addition, using 5-kW peak power, SC spectrum spanning up to 12 μm is obtained in the case of the CS2 liquid-filled C-PCF.
This paper reports on our recent progress with lead-silicate suspended-core microstructured optical fibers (SC- MOFs) for the detection of liquids. Simulations for SC-MOFs with one micrometer core diameter and of two different glass compositions with refractive indices of 1.67 and 1.89 at 1550 nm are discussed. Mode-field area study is performed for liquid analytes within refractive index range of 1.65-1.75. Experimental results of evanescent-wave refractometry are presented, with an impact study of uneven analyte-filling impact on the sensor performance. Studied SC-MOFs can find their application as monitoring sensors of various liquid quality especially when spectroscopic approach is pursued.
We report development of suspended-core silica and lead-silicate microstructured optical fibers for detection of liquids and supercontinuum generation. Theoretical analysis of effective mode area, dispersion curve, nonlinear coefficient and mode-field overlap is presented. For a specific lead-silicate fiber we determinated the zero dispersion wavelength at 1113 nm with a nonlinear coefficient of 1321 W-1km-1. For detection of liquids both silica and lead-silicate fibers are found to be suitable in different refractive index ranges 1.38-1.44 and 1.68-1.74 respectively. Coupling efficiency into all studied fibers over 40%; fiber attenuation was measured by the cut-back technique and is approximately 2 dB/m for silica glass fibers and over 3 dB/m for lead-silicate fibers.
A defected core decagonal photonic crystal fiber is designed and numerically optimized to obtain its residual chromatic dispersion compensation in the wavelength range of 1460 to 1675 nm i.e., over S+C+L+U wavelength bands having an average dispersion of about −390 ps/(nm km) with a dispersion variation of 7 ps/(nm km). The designed fiber, with a flattened dispersion profile, has four rings of holes in the cladding region, which results in low confinement loss and small effective mode area at wavelength 1550 nm. For residual chromatic dispersion compensation, the proposed fiber can be used in wavelength division multiplexing optical fiber data communication systems.
A highly birefringent dispersion compensating microstructure optical fiber (MOF) based on a modified spiral (MS)-MOF is presented that successfully compensates the dispersion covering the E- to L-communication bands ranging from 1370 to 1640 nm. It is shown theoretically that it can obtain a negative dispersion coefficient of about −221 to −424 ps/(nm⋅km) ) over S to L bands and −327 ps/(nm⋅ km) ) at the operating wavelength of 1550 nm. The relative dispersion slope is perfectly matched to that of single-mode fiber of about 0.0036 nm −1 . Besides, the proposed MS-MOF offers high birefringence of 1.79×10 −2 with a large nonlinear coefficient of about 41.8 W −1 km −1 at the operating wavelength along with two zero dispersion wavelengths at 610 and 1220 nm. Futhermore, the variation of structural parameters is also studied to evaluate the tolerance of the fabrication.
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