This paper reports some of our recent work on in-line devices based on air-silica microstructrue optical fibers.
These devices are fabricated by use of a CO2 laser/a femtosecond infrared laser and include strong long period
gratings in index-guiding fibers and air-core photonic bandgap fibers, in-fiber polarizers, polarimeters, and modal
interferometers. Applications of such devices for strain, temperature, directional bend, twist, and gas sensing are
discussed.
The cut-off wavelengths of the two linearly polarized states in PCF can be designed by varying the diameters and pitch of the holes. Simulations show that single polarization operation over a range of up to 100 nm can be realized around 1.3 μm and 1.55 μm bands.
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