Tunable Grating Couplers for Broadband Operation Using Thermo-Optic Effect in Silicon

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We demonstrate a tunable grating coupler for broadband operation using an impurity-doped thermo-optic heater fabricated by complementary metal-oxide-semiconductor-compatible processes. As a thermo-optic heater, a p-n diode is employed to have a p-type region inside of an in-coupling grating connected with outside p+/n+ contacts and is heated directly by a current flow through the grating. Applying a forward-bias voltage of 7 V, we shift the central wavelength of the grating coupler from 1525 to 1574 nm with a coupling efficiency of close to -4 dB. Considering a 1-dB bandwidth at each central wavelength, we extend the operational bandwidth to nearly 90 nm. A thermal tuning efficiency of 0.23 nm/mW and transient responses of 32/22 mu s for heating/cooling times are obtained.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2015-11
Language
English
Article Type
Article
Keywords

NANOPHOTONIC WAVE-GUIDES; ON-INSULATOR; OPTICAL-FIBERS; EFFICIENT; COMPACT

Citation

IEEE PHOTONICS TECHNOLOGY LETTERS, v.27, no.21, pp.2304 - 2307

ISSN
1041-1135
DOI
10.1109/LPT.2015.2462081
URI
http://hdl.handle.net/10203/205202
Appears in Collection
EE-Journal Papers(저널논문)
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