Related Experiment Video
Updated: May 9, 2026
13:02
Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
Published on: February 25, 2017
Bend-resistant large-mode-area photonic crystal fiber with a triangular-core
Xin Wang1, Shuqin Lou, Wenliang Lu
1School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China.
Applied Optics
|July 12, 2013
Summary
A novel photonic crystal fiber with a triangular core offers bend resistance for high-power fiber lasers. This large-mode-area fiber maintains performance even when bent, minimizing mode field area loss.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Photonic crystal fibers (PCFs) are crucial for advanced optical applications.
- Maintaining large mode areas (LMAs) under bending is a significant challenge in PCF development.
- Bend distortion can degrade the performance of optical fibers, limiting their use in high-power systems.
Purpose of the Study:
- To propose and analyze a bend-resistant large-mode-area photonic crystal fiber with a triangular core.
- To address the issue of bend distortion in PCFs for practical applications.
- To evaluate the fiber's performance under bending conditions, focusing on mode field area and single-mode operation.
Main Methods:
- Numerical simulation of a photonic crystal fiber with a triangular core.
- Analysis of mode field area at a wavelength of 1.064 μm in both straight and bent states.
- Investigation of single-mode operation and bending orientation angle under a bending radius of 30 cm.
Main Results:
- The proposed fiber achieves a mode field area of 930 μm² in the straight state and 815 μm² at a 30 cm bending radius.
- The decrement in mode field area at the bent state is only 12.473% compared to the straight state.
- The fiber maintains single-mode operation and allows a bending orientation angle up to ±55° at a 30 cm bending radius.
Conclusions:
- The designed triangular-core photonic crystal fiber exhibits excellent bend resistance and a large mode area.
- Low sensitivity to bending orientation and sustained large mode area under bending make it suitable for high-power fiber lasers.
- The fiber's feasibility for fabrication and application is highlighted, paving the way for advanced laser systems.
Related Concept Videos
01:23Design of Prismatic Beams for Bending
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and stress...
01:18Unsymmetric Bending
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The orientation of the...
01:22Fiber Reinforced Concrete
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
01:27Symmetry Elements in a Crystal
Crystal symmetry operations are isometric transformations that map objects onto indistinguishable copies while preserving distances, angles, and volumes. The simplest symmetry operation is translation, which shifts the entire infinite crystal lattice parallelly by a translation vector.Crystallographic rotations involve rotations by an angle of 2π/n around an axis without changing the positions of points on the axis. It is called the rotational axis of the symmetry, denoted by n. The combination...
01:15Unsymmetric Bending - Angle of Neutral Axis
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...