Results 231 to 240 of about 644,703 (262)

Improvement of the mode quality in large mode area (LMA) fibres

SPIE Proceedings, 2008
We used the offset launch and the near field imaging technique to analyse the modal content of large mode area (LMA) fibres in different launch conditions. The coiling technique was applied to suppress higher order mode contents in order to estimate the modal power distribution and to verify the loss factor for the single modes. Based on this analysis,
Stefan Grünsteidl, J. M. Sousa, Ger O'Connor, Tom Glynn   +3 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

Influence of mode distortion on the transverse mode competition in large-mode-area amplifiers

Optics Communications, 2009
Abstract In large mode area fiber amplifier, it is difficult to avoid the bend induced mode distortion. With the existence of mode distortion taken into account, a previous transverse mode competition model has been improved. Based on this model and the finite element difference-beam propagation method, the behaviors of bent mode competition are ...
Suying Liao, Mali Gong, Haitao Zhang
openaire   +1 more source

On the measurement of fundamental mode bend loss in large-mode-area optical fibers

Applied Optics, 2017
The measurement of fundamental mode bend loss is thoroughly studied in large-mode-area few-mode optical fibers. The influencing factors, including spectral properties of the light source, modal power content and cladding light, are experimentally investigated.
Changgeng, Ye, Joona, Koponen, Ville, Aallos, Teemu, Kokki, Ossi, Kimmelma   +4 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

Propagation of femtosecond pulses in large-mode-area, higher-order-mode fiber

Optics Letters, 2006
We demonstrate propagation of 14 nJ femtosecond pulses through a large-mode-area, higher-order-mode (HOM) fiber with an effective area of 2100 microm2. The pulses propagate stably in the LP07 mode of the fiber through lengths as long as 12 m. The strongly chirped pulses exiting the amplifier fiber are dechirped by the high-order-mode fiber, resulting ...
J W, Nicholson, S, Ramachandran, S, Ghalmi, M F, Yan, P, Wisk, E, Monberg, F V, Dimarcello   +6 more
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

Limitation on Effective Area of Bent Large-Mode-Area Leakage Channel Fibers

Journal of Lightwave Technology, 2011
We investigate the bending characteristics of leakage channel fibers (LCFs) to achieve large mode area (LMA) and effectively single-mode operation with a practically allowable bending radius for compact Yb-doped fiber applications. Through numerical simulations, carried by the full-vectorial finite-element method, we present the limitations on the ...
Saitoh Kunimasa, Varshney Shailendra, Sasaki Kaori, ROSA, Lorenzo, Pal Mrinmay, Paul Mukul Chandra, Ghosh Debashri, Bhadra Shyamal Kumar, Koshiba Masanori   +8 more
openaire   +3 more sources

Polarization-mode dispersion of large mode-area photonic crystal fibers

Optics Communications, 2003
We report on an experimental study of the polarization properties of large mode-area photonic crystal fibers (PCFs). We find that such fibers may exhibit very low birefringence and polarization-mode dispersion (PMD) indicating a highly symmetrical hole structure over a long length.
Ritari, Tuomo, Niemi, Tapio, Ludvigsen, Hanne, Wegmuller, Mark, Gisin, Nicolas, Folkenberg, Jacob Riis, Petterson, Anders   +6 more
openaire   +2 more sources

Characterization of higher-order-mode content in large-mode-area fibers

2008 Conference on Lasers and Electro-Optics, 2008
Higher-order modes propagating in large-mode-area fibers are characterized using spatially-resolved modal interference. The measurements provide the fraction of power contained in multiple higher-order-modes, and allow for mode identification without prior knowledge of the fiber characteristics.
J.W. Nicholson, A.D. Yablon, S. Ramachandran   +2 more
openaire   +1 more source