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Proceedings Paper

Beam profile approach to lens design for fiber optics
Author(s): Andrew B. Tsiboulia
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Paper Abstract

The common approach to designing multimode fiber coupling lenses is based on fiber end-face imaging. A model, proposed here, deals with beam profiles. Paraxial ray tracing shows that the output of a graded-index multimode fiber has a hyperbolic profile, similar to a singlemode beam. Focusing this beam by a lens is similar to a Gaussian beam focusing. Light focused from a step-index multimode fiber has two waists. Matching their size and NA to fiber parameters is not enough for good coupling: the beam profile should in fact be corrected. The propagation properties of graded-index multimode fiber beams are similar to singlemode beams and differ from step-index multimode fiber beams. The beam profile approach defines these properties, while the imaging approach often fails. A ray model, describing the beam profile, is convenient in computer simulation of lens systems for fiber optics. It visualizes beams in ray-tracing codes such as ZEMAX and allows aberration optimization regarding minimal beam distortion. Gaussian beam diffraction is not an issue, if there is no beam clipping - the ray model is consistent with the traditional wave model. These results are important for correct design of fiber coupling lenses.

Paper Details

Date Published: 17 February 2003
PDF: 10 pages
Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003); doi: 10.1117/12.474042
Show Author Affiliations
Andrew B. Tsiboulia, JDS Uniphase Corp. (Canada)

Published in SPIE Proceedings Vol. 4833:
Applications of Photonic Technology 5

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