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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 10 — May. 15, 2006
  • pp: 4237–4249

MEMS compatible micro-GRIN lenses for fiber to chip coupling of light

Michael Zickar, Wilfried Noell, Cornel Marxer, and Nico de Rooij  »View Author Affiliations

Optics Express, Vol. 14, Issue 10, pp. 4237-4249 (2006)

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Graded-Index (GRIN) lenses with a diameter of 125 µm are presented. This diameter enables the assembly of the GRIN lenses onto an optical micro-system using the same passive alignment grooves as used for the light carrying optical fibers. In contrast to refractive lenses, GRIN lenses have flat endfaces and the focal distance of a GRIN lens is defined by its length. Therefore, GRIN lenses can be diced from a selected multimode optical fiber with a regular wafer dicing machine. The effects of the resulting surface roughness are reduced by immersing the optical parts into index matching oil, which can not be applied for refractive lenses. This has a further advantage since an anti-reflective coating becomes dispensable. The coupling efficiency of a collimator set-up using the GRIN lenses is studied using paraxial ray calculations. The calculated minimal coupling losses of less than 0.3 dB are in excellent agreement with the measured results. Losses smaller than 2 dB over a coupling length of 2 mm have been measured.

© 2006 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(230.0230) Optical devices : Optical devices

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 21, 2006
Revised Manuscript: April 26, 2006
Manuscript Accepted: April 26, 2006
Published: May 15, 2006

Michael Zickar, Wilfried Noell, Cornel Marxer, and Nico de Rooij, "MEMS compatible micro-GRIN lenses for fiber to chip coupling of light," Opt. Express 14, 4237-4249 (2006)

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