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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 1 — Jan. 7, 2008
  • pp: 402–412

Multiple mode conversion and beam shaping with superimposed long period gratings

M. Sumetsky and S. Ramachandran  »View Author Affiliations

Optics Express, Vol. 16, Issue 1, pp. 402-412 (2008)

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We demonstrate how to convert several arbitrary optical fiber modes into a single mode and vice versa using superimposed long period gratings (SLPG). As an example, we theoretically consider SLPG consisting of five gratings, which couple first six LP0j modes of a single mode fiber. We optimize the SLPG output to form light beams that are focused at a distance 0.5 mm and 1 mm from the fiber. In addition, we optimize the SLPG output to generate a beam with an amplitude that is uniform inside a 40 angle with a ±0.2 % accuracy. In the latter case, the refractive index profile of the SLPG is calculated for an SMF-28 fiber. The proposed SLPG devices can be used as efficient all-fiber mode focusers and beam shapers.

© 2008 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2340) Fiber optics and optical communications : Fiber optics components
(230.2285) Optical devices : Fiber devices and optical amplifiers

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: October 31, 2007
Revised Manuscript: January 2, 2008
Manuscript Accepted: January 3, 2008
Published: January 4, 2008

M. Sumetsky and S. Ramachandran, "Multiple mode conversion and beam shaping with superimposed long period gratings," Opt. Express 16, 402-412 (2008)

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