Mid-infrared high birefringence As2Se3-based PCF with large nonlinearity and distinctive dispersion by using asymmetric elliptical air hole cladding

2018 ◽  
Vol 32 (03) ◽  
pp. 1850023 ◽  
Author(s):  
Zhanqiang Hui ◽  
Min Yang ◽  
Youkun Zhang ◽  
Meizhi Zhang
Keyword(s):  
Hexagonal Lattice ◽  
Fdtd Method ◽  
Polarization Mode Dispersion ◽  
Infrared Range ◽  
Polarization Direction ◽  
Mid Infrared ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Mode Dispersion ◽  
Difference Time

A novel high birefringence As2Se3-based hexagonal lattice photonic crystal fiber (PCF) is proposed. In the structure, a central defect core and three kinds of elliptical air holes with different major axes length and ellipticity are introduced in the cladding. The finite difference time domain (FDTD) method with perfectly matched layer (PML) absorption boundary conditions are used to simulate the guided modes of the designed PCF. The properties of this PCF are investigated in detail including the birefringence, beat length, dispersion, nonlinearity and polarization mode dispersion in the 2–5 [Formula: see text] mid-infrared range. The results show that for the optimized structure parameters of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], the high birefringence of 0.1192 and beat length of 41.93 [Formula: see text] are obtained. The maximum nonlinearity coefficient of 10,050 w[Formula: see text]km[Formula: see text] and 15,200 w[Formula: see text]km[Formula: see text] for x- and y-polarization modes are achieved. The distinctive dispersion is analyzed, which is all-normal in x-polarization direction while it has two zero dispersion points at 3.18 [Formula: see text] and 3.65 [Formula: see text] in y-polarization direction. The designed PCF with high birefringence, large nonlinearity and distinctive dispersion will be beneficial for mid-infrared fiber sensing, mid-infrared spectroscopy and nonlinear optics applications.

scholarly journals Analysis of the Transmission Characteristic and Stress-Induced Birefringence of Hollow-Core Circular Photonic Crystal Fiber

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 128 ◽  
Author(s):  
Jingxuan Yang ◽  
Hu Zhang ◽  
Xiaoguang Zhang ◽  
Hui Li ◽  
Lixia Xi
Keyword(s):  
Photonic Crystal ◽  
Optical Fiber ◽  
Photonic Crystal Fiber ◽  
Structural Parameters ◽  
Polarization Mode Dispersion ◽  
Polarization Mode ◽  
Hollow Core ◽  
Transmission Characteristics ◽  
Crystal Fiber ◽  
Mode Dispersion

Orbital angular momentum modes in optical fibers have polarization mode dispersion. The relationship between polarization mode dispersion and the birefringence vector can be deduced using an optical fiber dynamic equation. First, a mathematical model was established to formulate mode dispersion caused by stress-induced birefringence. Second, in the stress-induced birefringence simulation model, the finite element method was used to analyze the transmission characteristics of the hollow-core circular photonic crystal fiber. Finally, mode dispersion caused by stress-induced birefringence was obtained using theoretical derivation and simulation analyses. The results showed that the new fiber type has good transmission characteristics and strong stress sensitivity, which provide key theoretical support for optimizing the structural parameters of optical fiber and designing stress sensors.

Endlessly single-mode photonic crystal fiber with high birefringence for sensing applications

2020 ◽  
Vol 34 (06) ◽  
pp. 2050077 ◽  
Author(s):  
Mohit Sharma ◽  
Vaishali Dixit ◽  
S. Konar ◽  
Kawsar Ahmed ◽  
Vigneswaran Dhasarathan
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Fdtd Method ◽  
Single Mode ◽  
Lattice Period ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Sensing Applications ◽  
Operating Wavelength

A novel type of highly birefringent photonic crystal fiber is designed, which yields to promise a very large birefringence [Formula: see text] with flat dispersion at the operating wavelength 1550 nm. By employing the FDTD method, other properties, such as dispersion, walk-off effect and [Formula: see text]-parameters, are highly optimized using lattice period of air holes.

ENHANCED POLARIZATION SOLITON'S ROBUSTNESS TO POLARIZATION MODE DISPERSION IN FIBER SYSTEMS WITH FREQUENCY-DEPENDENT LOSS

2006 ◽  
Vol 20 (17) ◽  
pp. 1023-1031 ◽  
Author(s):  
WEICHENG CHEN ◽  
WENCHENG XU ◽  
AIPING LUO ◽  
HU CUI ◽  
ZHANQIANG LIANG ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Polarization Mode Dispersion ◽  
Bound State ◽  
New Method ◽  
Polarization Mode ◽  
Frequency Dependent ◽  
High Birefringence ◽  
Mode Dispersion ◽  
State Of Polarization ◽  
Adaptive Abilities

We propose a new method to strengthen the nonlinear pulses robustness to polarization mode dispersion in the conventional lossy fiber systems. The method is based on the generation of the stable trapped state of polarization solitons in an initial optical fiber with high birefringence. It is proven that the obtained bound state of nonlinear pulses have stronger adaptive abilities to polarization mode dispersion than common solitons when they propagate in conventional fibers with random birefringence.

scholarly journals Tunable Mid-Infrared Graphene Plasmonic Cross-Shaped Resonator for Demultiplexing Application

2020 ◽  
Vol 10 (3) ◽  
pp. 1193 ◽  
Author(s):  
Somayyeh Asgari ◽  
Tapio Fabritius
Keyword(s):  
Fdtd Method ◽  
Three Dimensional ◽  
Single Mode ◽  
Transmission Spectra ◽  
Mid Infrared ◽  
Coupled Mode ◽  
Light Waves ◽  
Dimensional Parameters ◽  
Difference Time ◽  
Sub Wavelength

In this study, a tunable graphene plasmonic filter and a two-channel demultiplexer are proposed, simulated, and analyzed in the mid-infrared (MIR) region. We discuss the optical transmission spectra of the proposed cross-shaped resonator and the two-channel demultiplexer. The transmission spectra of the proposed MIR resonator are tunable by change of its dimensional parameters and the Fermi energy of the graphene. Our proposed structures have a single mode in the wavelength range of 5–12 µm. The minimum full width at half maximum (FWHM) and the maximum transmission ratio of the proposed resonator respectively reached 220 nm and 55%. Simulations are performed by use of three-dimensional finite-difference time-domain (3D-FDTD) method. Coupled mode theory (CMT) is used to investigate the structure theoretically. The numerical and the theoretical results are in good agreement. The performance of the proposed two-channel demultiplexer is investigated based on its crosstalk. The minimum value of crosstalk reaches −48.30 dB. Our proposed structures are capable of providing sub-wavelength confinement of light waves, useful in applications in MIR region.

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