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26 February 2013 Robust single-mode all solid photonic bandgap fibers with core diameter of 50 μm
Liang Dong, Kunimasa Saitoh, Fanting Kong, Thomas Hawkins, Devon Mcclane, Guancheng Gu
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Proceedings Volume 8601, Fiber Lasers X: Technology, Systems, and Applications; 86011U (2013) https://doi.org/10.1117/12.981805
Event: SPIE LASE, 2013, San Francisco, California, United States
Abstract
There are still very strong interests for power scaling in high power fiber lasers for a wide range of applications in medical, industry, defense and science. In many of these lasers, fiber nonlinearities are the main limits to further scaling. Although numerous specific techniques have studied for the suppression of a wide range of nonlinearities, the fundamental solution is to scale mode areas in fibers while maintaining sufficient single mode operation. Here the key problem is that more modes are supported once physical dimensions of waveguides are increased. The key to solve this problem is to look for fiber designs with significant higher order mode suppression. In conventional waveguides, all modes are increasingly guided in the center of the waveguides when waveguide dimensions are increased. It is hard to couple a mode out in order to suppress its propagation, which severely limits their scalability. In an allsolid photonic bandgap fiber, modes are only guided due to anti-resonance of cladding photonic crystal lattice. This provides strongly mode-dependent guidance, leading to very high differential mode losses. In addition, the all-solid nature of the fiber makes it easily spliced to other fibers. In this paper, we will show for the first time that all-solid photonic bandgap fibers with effective mode area of ~920μm2 can be made with excellent higher order mode suppression.
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Liang Dong, Kunimasa Saitoh, Fanting Kong, Thomas Hawkins, Devon Mcclane, and Guancheng Gu "Robust single-mode all solid photonic bandgap fibers with core diameter of 50 μm", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86011U (26 February 2013); https://doi.org/10.1117/12.981805
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KEYWORDS
Optical fibers
Fermium
Frequency modulation
Waveguides
Cladding
Solids
Birefringence
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