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
2018-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
