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Compact High-Performance Multimode Interference Couplers in Silicon-on-Insulator

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8 Author(s)
Halir, R. ; Dept. de Ing. de Comun., Univ. de Malaga, Malaga, Spain ; Ortega-Monux, A. ; Molina-Fernadez, I. ; Wanguemert-Perez, J.G.
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We demonstrate compact multimode interference (MMI) couplers on silicon-on-insulator that exhibit both high performance and relaxed tolerances. The devices are fabricated with a single shallow etch step on 1.5-mum-thick silicon, and have a footprint of 12.8 mum times 456 mum, including 100-mum-long tapers at input and output. In a Mach-Zehnder configuration, we achieve an extinction ratio larger than 22 dB for transverse-electric polarization and larger than 20 dB for transverse-magnetic polarization. This extinction ratio is maintained in the full 1520- to 1580-nm band and for MMI width variations in a range of 0.45 mu m. We also show appreciable tolerance differences between paired and general excitation MMIs.

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Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 21 )