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Proceedings Paper

Characterization of modal coupling of Bragg gratings in large-mode-area fibers
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Paper Abstract

A new measurement technique for characterizing the magnitude of power coupling from the fundamental mode to higher order core- and cladding-bounded modes occurring in a fiber Bragg grating (FBG) inscribed in a large-mode-area (LMA) fiber is demonstrated and studied. The method is based on inducing mode selective fiber bending losses on the modes propagating in the core and monitoring the power guided by the cladding of the LMA fiber. Besides transmitted, also reflected distributions of modes can be resolved in terms of the relative powers carried by them and thus the fraction of higher order modes (HOMs) can be quantified. Additionally, the method can distinguish the mode content spectrally with high resolution. Sample FBGs having a chirped index profile are characterized using the method. It is shown that the method can yield information that is useful for better design and optimization of fiber optic devices utilizing FBGs in LMA fibers, such as fiber lasers.

Paper Details

Date Published: 10 February 2011
PDF: 9 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141Z (10 February 2011); doi: 10.1117/12.872361
Show Author Affiliations
Aarni Iho, Aalto Univ. School of Science and Technology (Finland)
Ari Tervonen, Aalto Univ. School of Science and Technology (Finland)
Kalle Ylä-Jarkko, Corelase Oy (Finland)
Simo Tammela, Beneq Oy (Finland)
Seppo Honkanen, Aalto Univ. School of Science and Technology (Finland)

Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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