Thermo-optic instabilities in asymmetric dual-core amplifiers

Jesper Lægsgaard*, Federica Poli, Annamaria Cucinotta, Stefano Selleri

*Corresponding author for this work

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Dynamical thermo-optic instabilities in asymmetric dual-core fiber amplifiers are investigated by numerical simulations. A coupled-mode model capable of describing the asymmetric dual-core structure is derived, and structures with various levels of refractive-index asymmetry from 10−6 to 10−4 are studied. The most viable route to avoid thermally induced power signal field fluctuations is found to be core decoupling via large separation and strong refractive-index asymmetry. A design criterion for this strategy to be effective is suggested based on the numerical results.

Original languageEnglish
JournalJournal of the Optical Society of America B: Optical Physics
Issue number5
Pages (from-to)1494-1501
Publication statusPublished - 1 May 2020

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