Results 251 to 260 of about 330,461 (300)

Very-large-mode-area, single-mode multicore fiber

Optics Letters, 2009
A single-mode evanescently coupled multicore fiber consisting of 19 hexagonally arranged cores is investigated. Theoretical and experimental results are presented and compared to an equivalent hypothetical step-index fiber. A fundamental mode with an effective area of 465 microm(2) and a beam propagation factor M(2) of 1.02 was measured, showing the ...
Moritz M, Vogel, Marwan, Abdou-Ahmed, Andreas, Voss, Thomas, Graf   +3 more
openaire   +2 more sources

Ultra-Large Mode-Area Fibers

2007 Conference on Lasers and Electro-Optics (CLEO), 2007
We review the performance and applications of a recently demonstrated platform that utilises higher-order modes in few-moded fibers to facilitate robust, bend-resistant, long-length light-propagation in ultra-large modal areas.
Siddharth Ramachandran, Samir Ghalmi, Man Yan   +2 more
openaire   +1 more source

Mode coupling in few-mode large-mode-area fibers

SPIE Proceedings, 2014
We present an experimental study on mode coupling characteristics of few-mode large-mode-area (LMA) fibers, which are widely used in high power fiber lasers. The modal power allocation is measured by modal decomposition of the nearfield intensity profile of the output beam.
Changgeng Ye, Joona Koponen, Ville Aallos, Laeticia Petit, Ossi Kimmelma, Teemu Kokki   +5 more
openaire   +1 more source

Parasitic Modes in Large Mode Area Microstructured Fibers

OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007
We present experimental evidence for parasitic modes guided by both bandgap and low density of state effects in large mode area silica microstructured fibers and explore ways of minimizing their presence via the fiber geometry.
Joanne C. Flanagan, R. Amezcua-Correa, F. Poletti, J.R. Hayes, N.G.R. Broderick, D.J. Richardson   +5 more
openaire   +1 more source

Design of large mode area, mode selection fiber

SPIE Proceedings, 2014
The paper study on the effect of index distribution on the mode field and calculated the mode distribution in various index profiles. A single mode gaussian hybrid multicore fiber with 19 hexagonally arranged high index quartz rods is designed and investigated. Theoretical and simulative results are presented and compared to the conventional large mode
Liang Jin, Li Xu, He Zhang, Yonggang Zou, Ye Ding, Xiaohui Ma   +5 more
openaire   +1 more source

Extra-Large-Mode-Area Few-Mode Laser Fiber

Asia Communications and Photonics Conference 2016, 2016
An Yb-doped extra-large-mode-area few-mode laser fiber was fabricated successfully by chelate precursor doping technique. With refractive index difference of 0.0004 and numerical aperture of 0.036, the $25-\mu \text{m}$ -core fiber possesses extra-large-mode-area and few-mode properties.
Zhaonian Jia, Huan Zhan, Yuying Wang, Cong Gao, Li Ni, Xiaolong Wang, Aoxiang Lin   +6 more
openaire   +1 more source

Mode instabilities in large-mode-area fiber amplifiers

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC, 2013
The onset of mode instabilities is an effect occurring in high-average-power fiber lasers and amplifiers when their output average power exceeds a certain threshold value [1]. This effect is characterized by a sudden change of the output beam from an initially stable fundamental mode to a regime with more or less chaotic fluctuations between the ...
T. Eidam, C. Jauregui, H.-J. Otto, F. Jansen, F. Stutzki, J. Limpert, A. Txfcnnermann   +6 more
openaire   +1 more source

Single-mode large-mode-area Er-Yb fiber

Optical Components and Materials XVI, 2019
Single-mode Er-Yb fibers based on phosphorosilicate glass matrix highly doped with fluorine have been fabricated using modified all-gas phase MCVD technology. Fibers have core doped by 6.5 mol.% of P2O5, 0.9 wt.% of F and different concentration of Er and Yb. The core NA was about 0.07-0.08 relative to the pure silica level.
Maxim Khudyakov, Aleksey Lobanov, Denis Lipatov, Konstantin Bobkov, Svetlana Aleshkina, Tatyana Kochergina, Mikhail Bubnov, Alexey Abramov, Nikolai Vechkanov, Aleksey Guryanov, Mikhail E. Likhachev   +10 more
openaire   +1 more source

Highly dispersive large mode area photonic bandgap fiber

Optics Letters, 2007
An all-silica photonic bandgap fiber composed of a low-index core surrounded by alternating high- and low-index rings allows us to achieve a large mode area (500 microm(2)) and large chromatic dispersion. Sharp resonances from the even Bragg mode to odd ring modes theoretically lead to 20,000 ps/(nm km) chromatic dispersion when large bends are applied.
Gérôme, Frédéric, Février, Sébastien, Pryamikov, A., Auguste, Jean-Louis, Jamier, Raphaël, Blondy, Jean-Marc, Likhachev, M.E., Bubnov, M.M., Semjonov, S.L., Dianov, E.M.   +9 more
openaire   +3 more sources

Filamentation analysis in large-mode-area fiber lasers

Journal of the Optical Society of America B, 2006
We drive an analytic expression for filament gain in fiber lasers due to self focusing. The filamentation process has two thresholds that must be met, with beam-quality degradation occurring for peak powers above a megawatt.
L. Sun, J. R. Marciante
openaire   +1 more source