The dispersion and mode characteristics in a dual-concentric-core photonic crystal fiber, based on pure silica, are simulated by the multipole method. The fiber exhibits very large negative dispersion due to anticrossing of two individual inner core and outer core modes. Near the wavelength of 1.55 microm, we could obtain narrowband dispersion-compensating fiber with dispersion values of -23,000 ps/km/nm, broadband dispersion-compensating fiber with dispersion values from -1000 ps/km/nm to -2500 ps/km/nm over a 200 nm range, and kappa values near 300 nm, which matched well with standard single mode fiber. It shows that even if there are some changes in the structure parameters during fabrication, these fibers can still maintain a fine dispersion-compensating property.
An ultra-broadband single polarization filter based on plasmonic photonic crystal fiber with a liquid crystal core is investigated using the full-vectorial finite element method. Numerical simulations show that the loss of x-polarized core mode is better than 248.95 dB/cm in a 1.25-2.1 μm wavelength range, while the corresponding loss of y-polarized core mode is lower than 0.21 dB/cm. The high polarization extinction ratio is obtained at the communication wavelength of 1.3 μm, where the losses of x-and y-polarized core modes are 433.25 and 0.0064 dB/cm, respectively. When the fiber length is 1 mm, a broad bandwidth of 850 nm with an extinction ratio lower than −20 dB is obtained. Moreover, the proposed single polarization filter exhibits a better tolerance of realistic fabrication.
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