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Realization of novel low-loss monolithically integrated passive waveguide mode converters

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2 Author(s)
Holmes, B.M. ; Dept. of Electron. & Electr. Eng., Univ. of Glasgow, UK ; Hutchings, D.C.

The novel design and fabrication of monolithically integrated passive waveguide mode converters (WMCs), realized through the utilization of the reactive ion-etch lag (RIE Lag) phenomenon, is reported. The low-loss GaAs-AlGaAs WMCs have been characterized over a wavelength range of 900-940 nm, resulting in TE-TM (TM-TE) mode conversion with efficiencies of greater than 96% and low-loss devices with conversion lengths as short as 150 μm. The properties and characteristics of the fully integrated WMCs, fabricated with a single masking and etch process, are in agreement with theoretical predictions.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 1 )