Coupling to circularly asymmetric modes via long-period gratings made in a standard straight fiber
Coupling to circularly asymmetric modes via long-period gratings made in a standard straight fiber
We demonstrate long-period fiber gratings made in a straight standard optical fiber via a CO2 laser side irradiation that couples light between modes of different azimuthal symmetry. We show that such coupling can be even stronger than that to the azimuthally symmetric modes, provided the photoinduced asymmetry in the refractive index change across the fiber cross-section is high enough. This suggests that some previously-observed phenomena with CO2-written LPGs not observed with other types of LPGs may be attributed to LPG resonances that couple light into the cladding modes with higher azimuthal symmetry. We show it on an example of bend-induced LPG resonance position tuning with the resonance depth maintained constant.
90-93
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
1 July 2007
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Slavík, Radan
(2007)
Coupling to circularly asymmetric modes via long-period gratings made in a standard straight fiber.
Optics Communications, 275 (1), .
(doi:10.1016/j.optcom.2007.02.064).
Abstract
We demonstrate long-period fiber gratings made in a straight standard optical fiber via a CO2 laser side irradiation that couples light between modes of different azimuthal symmetry. We show that such coupling can be even stronger than that to the azimuthally symmetric modes, provided the photoinduced asymmetry in the refractive index change across the fiber cross-section is high enough. This suggests that some previously-observed phenomena with CO2-written LPGs not observed with other types of LPGs may be attributed to LPG resonances that couple light into the cladding modes with higher azimuthal symmetry. We show it on an example of bend-induced LPG resonance position tuning with the resonance depth maintained constant.
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Published date: 1 July 2007
Additional Information:
This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic in frame of 1K 04 program.
Identifiers
Local EPrints ID: 456645
URI: http://eprints.soton.ac.uk/id/eprint/456645
ISSN: 0030-4018
PURE UUID: 53172c8e-7989-4104-9ab2-72460cc71512
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Date deposited: 05 May 2022 17:00
Last modified: 18 Mar 2024 03:12
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