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Proceedings Paper

High performance multimode interference couplers for coherent communications in silicon
Author(s): R. Halir; G. Roelkens; A. Ortega-Moñux; J. G. Wangüemert-Pérez; I. Molina-Fernández
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Paper Abstract

We review the need for coherent optical communication systems and briefly describe the receiver frontend they require. The key element of the receiver is an optical 90° hybrid, which combines the received signal with the local oscillator laser with the adequate amplitude and phase relations. Silicon technology offers several advantages for the realization of such devices: compactness and CMOS compatibility, among others. However, the realization of high-performance hybrids is hampered by the high index contrast of this technology. We show that using multimode interference couplers with fully etched access waveguides and a shallowly etched multimode region, ultra-compact, high performance 90° hybrids can be realized. We experimentally demonstrate a device with a phase error below 5° and a common mode rejection ratio better than -20dBe in a ~50nm bandwidth.

Paper Details

Date Published: 8 September 2011
PDF: 7 pages
Proc. SPIE 8007, Photonics North 2011, 80071B (8 September 2011); doi: 10.1117/12.905341
Show Author Affiliations
R. Halir, Univ. de Málaga (Spain)
G. Roelkens, Ghent Univ. (Belgium)
A. Ortega-Moñux, Univ. de Málaga (Spain)
J. G. Wangüemert-Pérez, Univ. de Málaga (Spain)
I. Molina-Fernández, Univ. de Málaga (Spain)


Published in SPIE Proceedings Vol. 8007:
Photonics North 2011
Raman Kashyap; Michel Têtu; Rafael N. Kleiman, Editor(s)

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