Performance Enhanced Butt Coupling for Effective Interconnection Between Fiber and Silicon Nanowire

A performance enhanced butt coupling structure incorporating a vertically and laterally tapered SiON polymer core on silicon (Si) to tunnel and widen propagating optical modes of adiabatic taper is proposed. The proposed structure can effectively overcome the strong back reflections caused at the in...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2016-09, Vol.52 (9), p.1-6
Main Authors: Khandokar, Rezwanul Haque, Bakaul, Masuduzzaman, Asaduzzaman, Md, Nirmalathas, Ampalavanapillai, Skafidas, Stan
Format: Article
Language:English
Subjects:
Bandwidth
Butt coupling
Couplers
Coupling
Couplings
Design specifications
Efficiency
Fibers
grating coupling
Gratings
integrated optoelectronics
mode conversion
nanophotonics
Nanowires
Optical fiber couplers
optical waveguide
Performance enhancement
Polymers
Silicon
silicon nanowire
Silicon oxynitride
silicon photonics
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Summary:A performance enhanced butt coupling structure incorporating a vertically and laterally tapered SiON polymer core on silicon (Si) to tunnel and widen propagating optical modes of adiabatic taper is proposed. The proposed structure can effectively overcome the strong back reflections caused at the interface between fiber and Si nanowire to enable higher coupling efficiency. The placement of the SiON polymer core is chosen to restrict the passage of light through the bottom cladding to avoid unnecessary leakage. The performance of the structure is characterized for distinct features, including taping length, coupling efficiency, and coupling bandwidth for both single as well as cacaded configurations, compared with the state-of-the-art grating coupler. It is found that, with the right set of design specifications, butt couplers can outperform grating couplers in both coupling efficiency and bandwidth, although grating couplers are considered friendlier for wafer-level testing.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2016.2592804