Theory of thermo-optic instabilities in dual-core fiber amplifiers

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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


A coupled-mode theory for nonlinear mode coupling by the thermo-optic effect, originally developed for single-core fiber amplifiers, is applied to the case of dual-core amplifiers. It is shown that a non-phase-matched coupling term, which is usually irrelevant in single-core amplifiers, can strongly affect the mode stability when the coupling length between supermodes exceeds a few centimeters. The phase-mismatched coupling can lead to a strongly reduced instability threshold and static deformation effects for a range of intermediate coupling lengths. (C) 2018 Optical Society of America
Original languageEnglish
JournalOptics Letters
Issue number19
Pages (from-to)4775-4778
Publication statusPublished - 2018


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