20 February 2017 Thermo-optic tunable grating structure for coupler and radiator applications in silicon
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Proceedings Volume 10109, Optical Interconnects XVII; 101090Z (2017) https://doi.org/10.1117/12.2252161
Event: SPIE OPTO, 2017, San Francisco, California, United States
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.
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Seong-Hwan Kim, Seong-Hwan Kim, Jong-Hun Kim, Jong-Hun Kim, Sanggu Yeo, Sanggu Yeo, Geumbong Kang, Geumbong Kang, Jeongyoon Kim, Jeongyoon Kim, Dongeun Yoo, Dongeun Yoo, Harin Lee, Harin Lee, Dae-Seong Lee, Dae-Seong Lee, Hyo-Hoon Park, Hyo-Hoon Park, } "Thermo-optic tunable grating structure for coupler and radiator applications in silicon", Proc. SPIE 10109, Optical Interconnects XVII, 101090Z (20 February 2017); doi: 10.1117/12.2252161; https://doi.org/10.1117/12.2252161
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