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Low Loss Star Coupler Concept for AWGs in Rib Waveguide Technology

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6 Author(s)

We introduce a new concept for a tapered transition between waveguides and a free propagation region (FPR) for rib waveguide technology. The optical field is pressed downwards to the lower part of the guiding layer by tapering off the waveguide. The subsequent FPR is also etched down to the lower part of the guiding layer, which results in an adiabatic transition from the waveguide to the slab. Arrayed waveguide gratings, designed with this technique, were fabricated in silicon-on-insulator and showed a reduction in insertion loss of about 2.5 dB

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 23 )

Date of Publication:

Dec.1, 2006

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