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A novel photonic crystal fiber (PCF) based on a four-hole unit is proposed in order to meet the requirements of high birefringence, negative dispersion and confinement loss in fiber-optic communication. The proposed design has been simulated based on the full vector finite element method (FVFEM) and anisotropic perfectly matched layers (APML). Analysis results show that the proposed PCF can achieve a high birefringence to the order of 10 −2 at the wavelength of 1.55 μm, a large negative dispersion over a wide wavelength range and confinement losses lower than 10 −9 dB/m simultaneously, which has important applications in polarization-maintaining (PM) fibers, single-polarization single-mode (SPSM) fibers, dispersion compensation fibers and so on. [ABSTRACT FROM AUTHOR]

Abstract: A microstructured polymer optical fiber (mPOF) with both ultra-flattened near-zero chromatic dispersion and high birefringence based on Topas cyclic olefin copolymer is designed. Three rings of uniform elliptical air holes are arranged in triangular lattice in the cladding and an extra small defected hole is introduced in the fiber core. Guided modes, dispersion, birefringence and mode confinement properties of the designed mPOF are investigated by using the full-vector finite element method. Dispersion values between ±0.5ps/km/nm over the wavelength 1.1–1.7μm and high birefringence of the order of 10−3 are obtained for the optimized fiber structure. Low confinement losses and small effective mode area are obtained at the same time. The relatively simple architecture of the proposed Topas mPOF can be fabricated by our extrusion-stretching techniques. [Copyright &y& Elsevier]

Abstract: A novel polarizer is designed by liquid filling in partial air-holes of a hollow-core photonic bandgap fiber (PBGF) forming an asymmetric waveguide structure, which leads to the vertical polarization light leaking out while the horizontal polarization light remaining to propagate along the fiber with a relatively low loss. Applied with a full-vector finite-element (FEM) method, a series of polarizer structures with different water-filled regions has been simulated for a better performance on the polarization extinction ratio and the insertion loss. Through optimization, the proposed PBGF polarizer has a high polarization extinction ratio of more than 32dB in the operation wavelength range from 1530nm to 1600nm. [Copyright &y& Elsevier]

Abstract: We investigate the dispersion property of space filling mode of photonic crystal structures and find a new type of dispersion—structure induced dispersion. By incorporating this new source of dispersion we designed PCF with large normal dispersion ~350ps2/km. Our simulation indicates the dispersion of such fiber changes less than 3% in 1.4–1.7μm wavelength range and we also show that our design is insensitive to the structure changes. [Copyright &y& Elsevier]