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

Aarni Iho; Ari Tervonen; Kalle Ylä-Jarkko; Simo Tammela; Seppo Honkanen

doi:10.1117/12.872361

10 February 2011 Characterization of modal coupling of Bragg gratings in large-mode-area fibers

Aarni Iho, Ari Tervonen, Kalle Ylä-Jarkko, Simo Tammela, Seppo Honkanen

Proceedings Volume 7914, Fiber Lasers VIII: Technology, Systems, and Applications; 79141Z (2011) https://doi.org/10.1117/12.872361
Event: SPIE LASE, 2011, San Francisco, California, United States

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.

Citation Download Citation

Aarni Iho, Ari Tervonen, Kalle Ylä-Jarkko, Simo Tammela, and Seppo Honkanen "Characterization of modal coupling of Bragg gratings in large-mode-area fibers", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79141Z (10 February 2011); https://doi.org/10.1117/12.872361

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