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In this paper, we propose a defected core hexagonal lattice structure photonic crystal fiber (PCF) design which has optical properties like high nonlinearity, high birefringence and increased negative dispersion in the wavelength range 1300 nm– 1800 nm. The full vectorial finite element method is used to characterize the proposed design. An anisotropic perfectly matched layer is used to accurately...
In this paper we have proposed some new photonic crystal fiber structures whose geometries are derived from the polynomials of Pascal's Triangle (PT). The simulation of the proposed structures are carried out using OptiFDTD simulator with full vector mode solver using finite difference time domain (FDTD). The dispersion observed for the proposed structure was almost zero upto a wavelength of 8□m....
An endlessly single-mode highly polarization maintaining birefringent photonic crystal fiber at wavelength 1.55μm is reported in this paper by Full-Vectorial Finite Element Method (FV-FEM). By taking three ring hexagonal structure of PCF with suitable designing parameter such as symmetrical large hole diameter along two orthogonal axis near the core region d'= 2.2μm, air hole diameter d = 0.9μm and...
Birefringence of asymmetric PCF is investigated using the finite element method, under the circumstance of perturbation. By comparing the value of birefringence on the different value of d2/d1, the results indicate that with the intrinsic-birefringence increasing, the little effect on birefringence regardless of the offset of hole-position or the variation of hole-diameter.
A novel highly birefringent PCF with hybrid cladding is proposed. The birefringence is theoretically investigated with variant structural parameters and refractive index of filled material. The results show that the proposed PCF can provide high birefringence and be well tuned. It can be used as polarization controllers or sensors.
We propose a new birefringent index guiding PCF with hollow germanosilicate doped ring defects. Flexible modal birefringence control was achieved by not only the conventional hole-to-pitch ratio, but also thickness and relative index difference of the hollow ring defects to endow capabilities in PCF design.
Photonic crystal fibers have attracted increasing interest over the past few years because of their ability to provide manipulation in optical properties of light. High birefringence can be easily achieved in PCFS based on design flexibility and the large index contrast. Amongst several designs high birefringence exceeding 10-3 has been shown. Birefringence of the PCF can be further improved by employing...
We fabricate an EC-PBGF with an aspect ratio of 1.4 by expanding the core region. The loss and group-birefringence of the EC-PBGF was measured to be 0.1dB/m at 1400nm and 0.012 at 1420nm, respectively.
We present photonic crystals exhibiting a pronounced form birefringence at terahertz frequencies. These crystals can be employed as volumetric birefringent elements for a broad frequency range. Along with a theoretical discussion we demonstrate measurement results of a polymeric crystal.
We fabricated the highly birefringent photonic crystal fiber with squeezed lattice. The polarization dependent loss (PDL), differential group delay (DGD) and modal birefringence of fabricated fiber at 1550nm were measured to be 0.11dB, 2.18ps and 2.29×10-4, respectively.
In this paper, we have characterized a mid-IR nonlinear photonic device consisting of a highly nonlinear As2Se3 nanowire and a novel photonic crystal structure on silica clad. The lowest optical confinement was found about 60% over the entire bandwidth for an optimum nanowire radius of 600 nm. The highest anomalous GVD obtained was about 1348 ps/nm. km with the lowest anomalous GVD bandwidth of around...
A fiber optic curvature sensor with low-birefringence photonic crystal fiber (PCF) based Sagnac loop is demonstrated experimentally. The low-birefringence PCF is about 40cm long, using as the sensing element. The Sagnac output spectra under different curvatures are measured and analyzed. When the curvature is varied from 0 to 9.9m-1, the total wavelength shift is about 3.3nm, and it has a linear relationship...
An optical fiber strain sensor by using low-birefringence photonic crystal fiber (PCF) based Sagnac loop is demonstrated. A fiber Sagnac loop is formed by the low-birefringence PCF of about 40cm, and a section of about 140mm PCF is used as the strain sensing element. The output spectra of Sagnac loop under different strain levels are measured and analyzed. The sensitivity of the strain measurement...
We demonstrate polarization-insensitive wavelength multicasting of RZ-DPSK signal. The input signal is copied to four different wavelengths using four-wave mixing with unequally spaced pumps in a dispersion-flattened, highly nonlinear photonic crystal fiber with residual birefringence.
Analysis of the effects of thermal and external stress on the properties of solid core photonic crystal fibers has been carried out in this work by using the finite element method. The external stress acting on the fiber induces a specific stress distribution on the fiber's cross section making the isotropic fiber material birefringent. The effective index of the fiber under stress decreases almost...
The mode coupling properties of highly-birefringent tuneable LPGs formed in HC-PBGF are presented. The mode coupling from the fundamental core mode to higher-order guided mode of a HC-PBGF is obtained by use of periodic mechanical pressure.
We propose and demonstrate a novel method to characterize the variation of the birefringence induced by structural irregularities in highly birefringent photonic crystal fiber with high accuracy based on polarization coupling by torsional acoustic wave.
A multiphysics analysis of an all-fiber device based on photonic crystal fiber is reported. The device is a solid-core high-birefringent photonic crystal fiber with two integrated electrodes at the cladding region. A finite element code was used to perform an electro-thermo-mechanical-opto coupled analysis. The device operates applying an electrical current on the integrated electrodes that causes...
We present a fabrication and an experimental investigation of the birefringent properties of a Highly Birefrigent Hybrid Photonic Crystal Fiber. Polarization dependent loss as high as 21 dB is experimentally obtained on the photonic bandgap edges.
The response to pressure of a hollow core photonic crystal fiber is investigated. The fiber is designed to operate at 1550 nm but presents core-guided transmission windows in the visible spectral range that have shown to be highly dependent on the exact fiber structure. As the fiber is submitted to pressure, small structural and index changes, thus, affect these windows. The fiber response depends...
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