Guided mode gain competition in Yb-doped rod-type photonic crystal fibers

2009 ◽  
Author(s):  
F. Poli ◽  
D. Passaro ◽  
A. Cucinotta ◽  
S. Selleri ◽  
J. Lægsgaard ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fibers ◽  
Guided Mode ◽  
Crystal Fibers

Dispersion Properties of Photonic Crystal Fibers - Issues and Opportunities

2003 ◽  
Vol 797 ◽  
Author(s):  
J. Lægsgaard ◽  
S. E. Barkou Libori ◽  
K. Hougaard ◽  
J. Riishede ◽  
T. T. Larsen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Optical Fibers ◽  
Photonic Crystal Fibers ◽  
Complex Refractive Index ◽  
Dispersion Properties ◽  
Guided Mode ◽  
Index Contrast ◽  
Mode Group ◽  
Crystal Fibers

ABSTRACTThe dispersion, which expresses the variation with wavelength of the guided-mode group velocity, is one of the most important properties of optical fibers. Photonic crystal fibers (PCFs) offer much larger flexibility than conventional fibers with respect to tailoring of the dispersion curve. This is partly due to the large refractive-index contrast available in silica/air microstructures, and partly due to the possibility of making complex refractive-index structures over the fiber cross section. We discuss the fundamental physical mechanisms determining the dispersion properties of PCFs guiding by either total internal reflection or photonic bandgap effects, and use these insights to outline design principles and generic behaviours of various types of PCFs. A number of examples from recent modeling and experimental work serve to illustrate our general conclusions.

Seeing things in a hole new light: photonic crystal fibers

2001 ◽  
Author(s):  
Timothy A. Birks ◽  
Jonathan C. Knight ◽  
Brian J. Mangan ◽  
Philip S. Russell
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fibers ◽  
Crystal Fibers

scholarly journals Supercontinuum generation in photonic crystal fibers infiltrated with tetrachloroethylene

2021 ◽  
Vol 53 (4) ◽  
Author(s):  
Hieu Van Le ◽  
Van Thuy Hoang ◽  
Hue Thi Nguyen ◽  
Van Cao Long ◽  
Ryszard Buczynski ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Lattice Constant ◽  
Wavelength Range ◽  
Pump Pulse ◽  
Filling Factor ◽  
Photonic Crystal Fibers ◽  
Fused Silica ◽  
Anomalous Dispersion ◽  
Central Wavelength ◽  
Crystal Fibers

AbstractThis study proposes a photonic crystal fiber made of fused silica glass, with the core infiltrated with tetrachloroethylene (C2Cl4) as a new source of supercontinuum (SC) spectrum. We studied numerically the guiding properties of the several different fiber structures in terms of characteristic dispersion, mode area, and attenuation of the fundamental mode. Based on the results, the structural geometries of three C2Cl4-core photonic crystal fibers were optimized in order to support the broadband SC generations. The first fiber structure with lattice constant 1.5 μm and filling factor 0.4 operates in all-normal dispersion. The SC with a broadened spectral bandwidth of 0.8–2 μm is generated by a pump pulse with a central wavelength of 1.56 μm, 90 fs duration and energy of 1.5 nJ. The second proposed structure, with lattice constant 4.0 μm and filling factor 0.45, performs an anomalous dispersion for wavelengths longer than 1.55 μm. With the same pump pulse as the first fiber, we obtained the coherence SC spectrum in an anomalous dispersion range with wavelength range from 1 to 2 μm. Meanwhile, the third selected fiber (lattice constant 1.5 μm, filling factor 0.55) has two zero dispersion wavelengths at 1.04 μm and 1.82 μm. The octave-spanning of the SC spectrum formed in this fiber was achieved in the wavelength range of 0.7–2.4 μm with an input pulse whose optical properties are 1.03 μm wavelength, 120 fs duration and energy of 2 nJ. Those fibers would be good candidates for all-fiber SC sources as cost-effective alternatives to glass core fibers.

scholarly journals Characteristic Analysis and Structural Design of Hollow-Core Photonic Crystal Fibers with Band Gap Cladding Structures

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 284
Author(s):  
Bowei Wan ◽  
Lianqing Zhu ◽  
Xin Ma ◽  
Tianshu Li ◽  
Jian Zhang
Keyword(s):  
Photonic Crystal ◽  
Band Gap ◽  
Photonic Crystal Fibers ◽  
Relative Sensitivity ◽  
Confinement Loss ◽  
Hollow Core ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
The Core ◽  
Crystal Fibers

Due to their flexible structure and excellent optical characteristics hollow-core photonic crystal fibers (HC-PCFs) are used in many fields, such as active optical devices, communications, and optical fiber sensing. In this paper, to analyze the characteristics of HC-PCFs, we carried out finite element analysis and analyzed the design for the band gap cladding structure of HC-PCFs. First, the characteristics of HC19-1550 and HC-1550-02 in the C-band were simulated. Subsequently, the structural optimization of the seven-cell HC-1550-02 and variations in characteristics of the optimized HC-1550-02 in the wavelength range 1250–1850 nm were investigated. The simulation results revealed that the optimal number of cladding layers is eight, the optimal core radius is 1.8 times the spacing of adjacent air holes, and the optimal-relative thickness of the core quartz-ring is 2.0. In addition, the low confinement loss bandwidth of the optimized structure is 225 nm. Under the transmission bandwidth of the optimized structure, the core optical power is above 98%, the confinement loss is below 9.0 × 10−3 dB/m, the variation range of the effective mode field area does not exceed 10 μm2, and the relative sensitivity is above 0.9570. The designed sensor exhibits an ultra-high relative sensitivity and almost zero confinement loss, making it highly suitable for high-sensitivity gas or liquid sensing.

scholarly journals Long period fiber gratings written in photonic crystal fibers by use of CO2 laser

2013 ◽  
Vol 3 (3) ◽  
pp. 193-201 ◽  
Author(s):  
Yiping Wang ◽  
Changrui Liao ◽  
Xiaoyong Zhong ◽  
Jiangtao Zhou ◽  
Yingjie Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Co2 Laser ◽  
Photonic Crystal Fibers ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Crystal Fibers
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