Journal
OPTICS COMMUNICATIONS
Volume 283, Issue 19, Pages 3678-3682Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2010.05.034
Keywords
Integrated optics devices; Optical design and fabrication; Waveguide
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An ultra-low-loss coupler for interfacing a silicon-on-insulator ridge waveguide and a single-mode fiber in both polarizations is presented. The inverted taper coupler, embedded in a polymer waveguide, is optimized for both the transverse-magnetic and transverse-electric modes through tapering the width of the silicon-on-insulator waveguide from 450 nm down to less than 15 nm applying a thermal oxidation process. Two inverted taper couplers are integrated with a 3-mm long silicon-on-insulator ridge waveguide in the fabricated sample. The measured coupling losses of the inverted taper coupler for transverse-magnetic and transverse-electric modes are similar to 0.36 dB and similar to 0.66 dB per connection, respectively. (C) 2010 Elsevier B.V. All rights reserved.
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