Coherent beam transformations using multimode waveguides

X. Zhu, A. Schülzgen, H. Li, H. Wei, J. V. Moloney, N. Peyghambarian

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Physical insights and characteristics of beam transformations based on multimode interference (MMI) in multimode waveguides are illuminated and analyzed. Our calculations show that, utilizing a short piece of cylindrical multimode waveguide, an input Gaussian beam can be readily transformed to frequently desired beams including top-hat, donut-shaped, taper-shaped, and Bessel-like beams in the Fresnel or the Fraunhofer diffraction range, or even in both ranges. This is a consequence of diffraetive propagation of the field exiting the waveguide. The performance of the beam shaper based on MMI can be controlled via tailoring the dimensions of the multimode waveguide or changing the signal wavelength. This beam shaping technique is investigated experimentally using monolithic fiber devices consisting of a short piece of multimode fiber (∼ 10 mm long) and a single-mode signal delivery fiber.

Original languageEnglish (US)
Pages (from-to)7506-7520
Number of pages15
JournalOptics Express
Volume18
Issue number7
DOIs
StatePublished - Mar 29 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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