Results 251 to 260 of about 14,738,138 (292)

Single-modeness of short large mode area fibers: An experimental study

Optics Communications, 2007
Abstract We experimentally investigated the limits to the endlessly single-modeness of large mode area photonic crystal fibers. We analyzed two versions of a commercial large mode area fiber with equal structural parameters but five or seven confining rings, and in both cases we found that the single mode regime becomes critical for short ( 1 m ...
A.M. Grassi, F. Casagrande, M. D'Alessandro, S. Marinoni   +3 more
openaire   +2 more sources

Bend-compensated design of large-mode-area fibers

Optics Letters, 2006
Cone-shaped profiles illustrate the recently proposed bend-compensated strategy for large-mode-area amplifier fiber design. Simulations show that introducing a bend-compensating gradient into the fiber profile simultaneously improves mode area and reduces higher-order-mode impairments in a spooled-fiber amplifier.
openaire   +2 more sources

Photodarkening measurements in large mode area fibers

SPIE Proceedings, 2007
Yb-doped fibers are widely used in applications requiring high average output powers and high power pulse amplification. Photodarkening is one limiting factor in these fibers. In this paper, characterization of photodarkening in large-mode-area (LMA) fibers is presented building upon our previous work, which indicated that meaningful comparison of ...
Joona Koponen, Mikko Söderlund, Hanna J. Hoffman, Dahv Kliner, Jeffrey Koplow   +4 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

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

Effective Area Limit for Large Mode Area Laser Fibers

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference, 2008
We analyze practical constraints of fibers designs for achieving large mode area and single mode operation for fiber lasers, and provide estimated upper limits for the core diameter and effective area.
Ming-Jun Li, Xin Chen, Anping Liu, Stuart Gray, Ji Wang, Donnell T. Walton, Luis A. Zenteno   +6 more
openaire   +1 more source

Large-mode-area optical fiber for photonic nanojet generation

Optics Letters, 2019
The photonic nanojet (PNJ) generated by a shaped optical fiber tip is an attractive technology for laser micro-machining. The working distance has the same order of size as the fiber core diameter; therefore, multimode (MM) fibers are generally preferred.
Pierron, Robin, Chabrol, Grégoire, Roques, Stéphane, Pfeiffer, Pierre, Yehouessi, Jean-Paul, Bouwmans, Géraud, Lecler, Sylvain   +6 more
openaire   +3 more sources

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

Demonstration of bend-induced nonlinearities in large-mode-area fibers

Optics Letters, 2007
We present what we believe to be the first direct measurements of enhanced nonlinearities in large-mode-area fibers due to bend induced reductions in effective area. Both Raman scattering and self-phase modulation are observed to increase in tightly coiled fibers.
J W, Nicholson, J M, Fini, A D, Yablon, P S, Westbrook, K, Feder, C, Headley   +5 more
openaire   +2 more sources

Rectangle Lattice Large Mode Area Photonic Crystal Fiber

Optical Fiber Communication Conference, 2014
A rectangle-lattice photonic crystal fiber with a mode area of 2471 μm2 is successfully fabricated for the first time.
Xin Wang 0091, Shuqin Lou, Wenliang Lu
openaire   +1 more source