Static thermo-optic instability in double-pass fiber amplifiers | Zendy

Jesper Lægsgaard | Zendy

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Static thermo-optic instability in double-pass fiber amplifiers

Author(s) -

Jesper Lægsgaard

Publication year - 2016

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.24.013429

Subject(s) - optics , amplifier , physics , single mode optical fiber , optical amplifier , light beam , optical fiber , instability , refractive index , optoelectronics , mechanics , laser , cmos

A coupled-mode formalism, earlier used to describe transverse mode instabilities in single-pass optical fiber amplifiers is extended to the case of double-pass amplifiers. Contrary to the single-pass case, it is shown that the thermo-optic nonlinearity can couple light at the same frequency between the LP 01 and LP 11 modes, leading to a static deformation of the output beam profile. This novel phenomenon is caused by the interaction of light propagating in either direction with thermo-optic index perturbations caused by light propagating in the opposite direction. The threshold power for the static deformation is found to be several times lower than what is typically found for the dynamic modal instabilities observed in single-pass amplifiers.

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