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Modal power decomposition of beam intensity profiles into LP modes of multimode optical fibers

Modal power decomposition of beam intensity profiles into LP modes of multimode optical fibers
Modal power decomposition of beam intensity profiles into LP modes of multimode optical fibers
We calculate the modal power distribution of a randomly and linearly polarized (LP) multimode beam inside a cylindrical fiber core from knowledge of spatial-intensity profiles of a beam emitted from the fiber. We provide an exact analysis with rigorous proofs that forms the basis for our calculations. The beam from the fiber end is collimated by a spherical lens with a specific focal length. The original LP-mode basis is transformed by the spherical lens and forms another orthogonal basis that describes the free-space beam. By using this basis, we calculate the modal power distribution from the mutual-intensity profile. This is acquired by adopting a well known mutual-intensity-profile-retrieving technique based on measurements of the intensity patterns several times after two orthogonal cylindrical lenses with varying separation. The feasibility of our decomposition algorithm is demonstrated with simulations.
1084-7529
1241-1250
Soh, D.B.S.
63fa85d4-c6db-461a-8383-fdb1897bf3d0
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Baek, S.
18a2a74d-59db-4f45-9640-87f4a0a5af6b
Codemard, C.
71812eb8-df24-410b-a0dc-d1c40520d160
Jeong, Y.
85777b88-d35d-4e46-addb-1894fde2385d
Philippov, V.
221920b3-e4c6-4695-9567-33480372fbf8
Soh, D.B.S.
63fa85d4-c6db-461a-8383-fdb1897bf3d0
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Baek, S.
18a2a74d-59db-4f45-9640-87f4a0a5af6b
Codemard, C.
71812eb8-df24-410b-a0dc-d1c40520d160
Jeong, Y.
85777b88-d35d-4e46-addb-1894fde2385d
Philippov, V.
221920b3-e4c6-4695-9567-33480372fbf8

Soh, D.B.S., Nilsson, J., Baek, S., Codemard, C., Jeong, Y. and Philippov, V. (2004) Modal power decomposition of beam intensity profiles into LP modes of multimode optical fibers. Journal of the Optical Society of America A, 21 (7), 1241-1250. (doi:10.1364/JOSAA.21.001241).

Record type: Article

Abstract

We calculate the modal power distribution of a randomly and linearly polarized (LP) multimode beam inside a cylindrical fiber core from knowledge of spatial-intensity profiles of a beam emitted from the fiber. We provide an exact analysis with rigorous proofs that forms the basis for our calculations. The beam from the fiber end is collimated by a spherical lens with a specific focal length. The original LP-mode basis is transformed by the spherical lens and forms another orthogonal basis that describes the free-space beam. By using this basis, we calculate the modal power distribution from the mutual-intensity profile. This is acquired by adopting a well known mutual-intensity-profile-retrieving technique based on measurements of the intensity patterns several times after two orthogonal cylindrical lenses with varying separation. The feasibility of our decomposition algorithm is demonstrated with simulations.

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Published date: 2004
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 13938
URI: http://eprints.soton.ac.uk/id/eprint/13938
ISSN: 1084-7529
PURE UUID: eb103fa9-485e-422f-a737-f586e4c1965b
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 19 Jan 2005
Last modified: 16 Mar 2024 03:01

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Contributors

Author: D.B.S. Soh
Author: J. Nilsson ORCID iD
Author: S. Baek
Author: C. Codemard
Author: Y. Jeong
Author: V. Philippov

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