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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 24039–24048

Impact of fiber outer boundaries on leaky mode losses in leakage channel fibers

Guancheng Gu, Fanting Kong, Thomas W. Hawkins, Paul Foy, Kanxian Wei, Bryce Samson, and Liang Dong  »View Author Affiliations

Optics Express, Vol. 21, Issue 20, pp. 24039-24048 (2013)

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In a leakage channel fiber, the desired fundamental mode (FM) has negligible waveguide loss. Higher-order modes (HOM) are designed to have much higher waveguide losses so that they are practically eliminated during propagation. Coherent reflection at the fiber outer boundary can lead to additional confinement especially for highly leaky HOM, leading to lower HOM losses than what are predicted by conventional FEM mode solver considering infinite cladding. In this work, we conducted, for the first time, careful measurements of HOM losses in two leakage channel fibers (LCF) with circular and rounded hexagonal boundary shapes respectively. Impact on HOM losses from coiling, fiber boundary shapes and coating indexes were studied in comparison to simulations. This work, for the first time, demonstrates the limit of the simulation method commonly used in the large-mode-area fiber designs and the need for an improved approach. More importantly, this work also demonstrates that a deviation from circular fiber outer shape may be an effective method to mitigate HOM loss reduction from coherent reflection from fiber outer boundary, even in double-clad fibers, with HOM losses in excess of 20dB/m measured in the hexagonal LCF with ~50µm core diameter while keeping FM loss negligible.

© 2013 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: July 15, 2013
Revised Manuscript: September 19, 2013
Manuscript Accepted: September 24, 2013
Published: October 1, 2013

Guancheng Gu, Fanting Kong, Thomas W. Hawkins, Paul Foy, Kanxian Wei, Bryce Samson, and Liang Dong, "Impact of fiber outer boundaries on leaky mode losses in leakage channel fibers," Opt. Express 21, 24039-24048 (2013)

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