Highly Birefringrnt Photonic Crystal Fibers for Sensing Applications

This PCF structure having core of two different English alphabet shaped have been investigated using Finite difference time domain method. `Y'-shaped core and `T'-shaped core has been investigated twice, by changing the background material. Two background material silica and (non silica) lead silicate have been used. PCF structure having `T'-shaped core (structure `C') with silica as wafer reports much better results. Structure `C' and Structure `D' reports zero dispersion at second and third optical windows. Birefringence reported by structure `C' is also high and is of the order \pmb10
^-2
. Normalized frequency, confinement loss, splices loss and effective mode area of the designed fiber has also been studied.