An experimental investigation on an S-tapered photonic crystal fiber interferometer is presented. The whole fabrication process was carried out using a standard splicing machine. The interferometer shows a compact and stable structure with a waist diameter of 110 μm, taper length of 280 μm, and axial offset of 40 μm. The transmission spectra indicated that it is highly sensitive to the surrounding refractive index (RI) and insensitive to temperature. Resolutions of 3.3×10 −4 and 8.0×10 −5 RI units were achieved in the 1.33 to 1.38 and 1.38 to 1.44 range, respectively. Furthermore, its temperature dependence was only 4 pm/°C .
A novel high birefringence photonic crystal fiber (PCF) was proposed, which consists of hexagonal inner ring and
octagonal outer ring. A full vector finite element was applied to investigate the mode birefringence and chromatic
dispersion. It has been demonstrated from the calculated results that high birefringence to the order of 0.001 can be
achieved and ultra-flattened dispersion of -0.8~+0.2 ps/(km•nm) is obtained in 1.5 to 1.65μm wavelength range.
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