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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 7 — Mar. 29, 2010
  • pp: 7506–7520

Coherent beam transformations using multimode waveguides

X. Zhu, A. Schülzgen, H. Li, H. Wei, J. V. Moloney, and N. Peyghambarian  »View Author Affiliations


Optics Express, Vol. 18, Issue 7, pp. 7506-7520 (2010)
http://dx.doi.org/10.1364/OE.18.007506


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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 diffractive 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.

© 2010 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(130.2790) Integrated optics : Guided waves
(260.1960) Physical optics : Diffraction theory
(260.3160) Physical optics : Interference
(350.5500) Other areas of optics : Propagation
(350.6980) Other areas of optics : Transforms
(110.2945) Imaging systems : Illumination design

ToC Category:
Physical Optics

History
Original Manuscript: December 7, 2009
Revised Manuscript: February 23, 2010
Manuscript Accepted: February 28, 2010
Published: March 26, 2010

Citation
X. Zhu, A. Schülzgen, H. Li, H. Wei, J. V. Moloney, and N. Peyghambarian, "Coherent beam transformations using multimode waveguides," Opt. Express 18, 7506-7520 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-7-7506


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