Estimating modal instability threshold for photonic crystal rod fiber amplifiers

Mette Marie Johansen, Kristian Rymann Hansen, Marko Laurila, Thomas Tanggaard Alkeskjold, Jesper Lægsgaard

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We present a semi-analytic numerical model to estimate the transverse modal instability (TMI) threshold for photonic crystal rod amplifiers. The model includes thermally induced waveguide perturbations in the fiber cross section modeled with finite element simulations, and the relative intensity noise (RIN) of the seed laser, which seeds mode coupling between the fundamental and higher order mode. The TMI threshold is predicted to ~370 W – 440 W depending on RIN for the distributed modal filtering rod fiber.
Original languageEnglish
JournalOptics Express
Issue number13
Pages (from-to)15409-15417
Publication statusPublished - 1 Jul 2013

Bibliographical note

This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


  • Fiber design and fabrication
  • Fiber optics amplifiers and oscillators
  • Thermal effects
  • Microstructured fibers


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