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Optics Letters

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  • Vol. 36, Iss. 2 — Jan. 15, 2011
  • pp: 178–180

High-performance 90 ° hybrid based on a silicon-on-insulator multimode interference coupler

R. Halir, G. Roelkens, A. Ortega-Moñux, and J. G. Wangüemert-Pérez  »View Author Affiliations


Optics Letters, Vol. 36, Issue 2, pp. 178-180 (2011)
http://dx.doi.org/10.1364/OL.36.000178


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Abstract

We propose a multimode interference coupler (MMI) design for high-index-contrast technologies based on a shallowly etched multimode region, which is, for the first time to our knowledge, directly coupled to deeply etched input and output waveguides. This reduces the phase errors associated with the high-index contrast, while still allowing for a very compact layout. Using this structure, we fabricate a 2 × 4 MMI operating as a 90 ° hybrid, with a footprint of only 0.65 mm × 0.53 mm , including all the structures necessary to couple light to a fiber array. We experimentally demonstrate a common mode rejection ratio better than 20 dBe and phase errors better than ± 5 ° in a 50 nm bandwidth.

© 2011 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

History
Original Manuscript: October 27, 2010
Revised Manuscript: December 7, 2010
Manuscript Accepted: December 7, 2010
Published: January 10, 2011

Citation
R. Halir, G. Roelkens, A. Ortega-Moñux, and J. G. Wangüemert-Pérez, "High-performance 90° hybrid based on a silicon-on-insulator multimode interference coupler," Opt. Lett. 36, 178-180 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-2-178


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