Results 221 to 230 of about 79,106 (265)

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

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
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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

Multiring large-mode-area delivery fiber for high power

Applied Optics, 2013
The study presents a novel design of multiring delivery fiber with large mode area for high power. Using a FiberCAD method, we investigated a fiber whose core is surrounded by alternative low- and high-index rings. Based on our calculation, the effective area is 400 μm2 at 1.08 μm, larger than the ~280 μm2 of conventional step-index fiber (20/400). The
Li, Lu, Zhang, Aidong, Zhan, Huan, He, Jianli, Shi, Tengfei, Zhou, Zhiguang, Xiao, Xusheng, Lin, Aoxiang   +7 more
openaire   +3 more sources

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   +4 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

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

Numerical analysis of large mode area segmented cladding fibers

2013 22nd Wireless and Optical Communication Conference, 2013
We analyze numerically the dependence of segmented cladding fibers (SCF) characters, including the effective V-number, the effective fundamental mode area and the permissible bending radius of fundamental mode, on the structure parameters of the fiber and the signal wavelength with the methods of radial effective index and transmission matrix.
Hongmin Shao, Kailiang Duan, Yonggang Zhu, Hening Yang   +3 more
openaire   +1 more source

Ultra-large mode area fibers for high power lasers

Optical Fiber Communication Conference, 2018
The most recent advances on ultra-large mode area fibers for high-power operation will be presented. Moreover, an approach to synthetize ultra-large mode area fibers that circumvents technical limitations by using multi-core fibers will be discussed.
Cesar Jauregui, Jens Limpert, Andreas Tünnermann   +2 more
openaire   +3 more sources

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