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.

Theory of thermo-optic instabilities in dual-core fiber amplifiers / Laegsgaard, Jesper; Poli, Federica; Cucinotta, Annamaria; Selleri, Stefano. - In: OPTICS LETTERS. - ISSN 0146-9592. - 43:19(2018), pp. 4775-4778. [10.1364/OL.43.004775]

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

JESPER LÆGSGAARD;FEDERICA POLI;ANNAMARIA CUCINOTTA;STEFANO SELLERI
2018

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2850716
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