Ultra-low-loss inverted taper coupler for silicon-on-insulator ridge waveguide

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 w...

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Bibliographic Details
Published in:Optics communications 2010-10, Vol.283 (19), p.3678-3682
Main Authors: Pu, Minhao, Liu, Liu, Ou, Haiyan, Yvind, Kresten, Hvam, Jørn M.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fibers
Fundamental areas of phenomenology (including applications)
Geometrical optics
Integrated optics devices
Joining
Joints
Noise levels
Optical design and fabrication
Optical elements, devices, and systems
Optical system design
Optical waveguides and coupleurs
Optics
Physics
Polarization
Ridges
Tapering
Waveguide
Waveguides
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Description
Summary: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 ∼ 0.36 dB and ∼ 0.66 dB per connection, respectively.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2010.05.034