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Proceedings Paper

Thermo-optic tunable grating structure for coupler and radiator applications in silicon
Author(s): Seong-Hwan Kim; Jong-Hun Kim; Sanggu Yeo; Geumbong Kang; Jeongyoon Kim; Dongeun Yoo; Harin Lee; Dae-Seong Lee; Hyo-Hoon Park
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Paper Abstract

We propose tunable grating structures implemented by the change of the effective refractive index based on thermo-optic effect in silicon. For resistive heating, p-i-n or pn junction was formed in the grating region and surrounding region was thermally isolated. Fabricated tunable gratings were characterized by fiber-to-fiber measurement and Fourier-imaging system with a variation of the bias voltage applied to the heater. From a p-i-n type structure showing the best data, we achieved a wide tuning of the central wavelength in a range of 40 nm with an efficiency of 0.41 nm/mW. When this tunable grating structure is applied in the radiator of the optical phased array, the radiation angle was actively manipulated in a range of 2.7° in the longitudinal direction.

Paper Details

Date Published: 20 February 2017
PDF: 8 pages
Proc. SPIE 10109, Optical Interconnects XVII, 101090Z (20 February 2017); doi: 10.1117/12.2252161
Show Author Affiliations
Seong-Hwan Kim, KAIST (Korea, Republic of)
Jong-Hun Kim, National NanoFab Ctr. (Korea, Republic of)
Sanggu Yeo, KAIST (Korea, Republic of)
Geumbong Kang, KAIST (Korea, Republic of)
Jeongyoon Kim, KAIST (Korea, Republic of)
Dongeun Yoo, National NanoFab Ctr. (Korea, Republic of)
Harin Lee, KAIST (Korea, Republic of)
Dae-Seong Lee, KAIST (Korea, Republic of)
Hyo-Hoon Park, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 10109:
Optical Interconnects XVII
Henning Schröder; Ray T. Chen, Editor(s)

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