We demonstrate a spectroscopic gas sensor using an optical fiber probe with a replaceable insert. The probe consists of a hollow-core photonic bandgap fiber (HC-PBGF) with a core diameter of 10.9 μm and a glass tube where a 2-μm hollow core fiber (HCF) with a gold coated end facet can be inserted. The HCF is designed to function as both a gate where gases can enter the HC-PBGF and a mirror reflecting the guided light back to the HC-PBGF. The opposite distal end of the probe is also designed to be able to regulate the gas pressure within the HC-PBGF for a high gas flow rate, while still transmitting the reflected light to the analysis instrument. The remote sensing probe, we believe, has much potential for detecting gases in hazardous environments.
Fabrication and characferiration of microstructured polymer optical fibers (MPOFs) are presented. The effects of drawing femperahrre and heating fime during the fabrication processes are studied. Thefibers ahibif single-mode characteristics as predicted by numerical simulation.
SUMMARYSilica-based photonic crystal fibers (PCFs) have been studied extensively since they were successfully fabricated. Compared to traditional optical fibers, PCFs have a lot of attractive features. For example, with proper air hole panem designs, the, dispersion, cut-off wavelength, numerical aperture, and nonlinear coefficients can be manipulated to certain desired values, which can not be easily achieved by traditional optical fibers. Recently, polymer-based PCFs, which are generally called microstructured optical polymer fibers (MPOFs), have been fabricated and studied. Compared to silica-based PCFs, MPOFs have advantages such as better mechanical flexibility and considerable choices of material that can be used. In addition, MPOFs can in
Highly-Birefringent Photonic Crystal Fiber (Hi-Bi PCF) is composed of a single material, silica, so that its temperature sensitivity is extremely low. Therefore, we propose afiber based Sagnac interferometer for measurement of strain and curvature independent of temperature variation. The sensitivities of strain and curvature (both axes) are measured to be 1.41 pm/με and 0.93nm/m -1 (slow axis Y), -1.6 nm/m -1 (fast axis X), respectively.
We fabricate highly birefringent photonic crystal fiber with new structure using a stack and draw method. Fabricated fiber has two big air holes, one at each side of the outside air cladding region, leading to core ellipticity during the drawing process. Birefringence of the fabricated Hi-Bi PCF is measured to be 2.29 × 10-4 (at 1550 nm
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