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Adiabatic and Multimode Interference Couplers on Silicon-on-Insulator

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4 Author(s)
Solehmainen, K. ; VTT Tech. Res. Centre of Finland, Espoo ; Kapulainen, M. ; Harjanne, M. ; Aalto, T.

Adiabatic and multimode interference (MMI) 3-dB couplers based on silicon-on-insulator rib waveguides were fabricated and measured. For testing purposes, pairs of identical couplers were cascaded to form Mach-Zehnder interferometers. The adiabatic couplers showed excess on-chip loss of ~0.5 dB, extinction ratio (ER) of 15-20 dB, and a wide spectral range. The MMI couplers processed on the same wafer showed similar loss per coupler, higher ER, and limited spectral characteristics

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 21 )

Date of Publication:

Nov.1, 2006

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