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Proceedings Paper

Two-dimensional beam-steering using 1x16 silicon optical phased array with thermo-optic tunable grating radiators (Conference Presentation)
Author(s): Seong-Hwan Kim; Geumbong Kang; Jeongyoon Kim; Dae-Seong Lee; Nam-Hyun Kwon; Jong-Bum You; Dong-Eun Yoo; Dong-Wook Lee; Yun-Gi Ha; Chan-Hyun Youn; Kyungsik Yu; Hyo-Hoon Park
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Paper Abstract

Optical phased array (OPA) is considered as promising device in LiDAR application. We implemented a 1x16 silicon OPA consisting of an array of p-i-n electro-optic phase shifters and thermo-optic tunable grating radiators capable of two-dimensional beam-steering. The OPA was fabricated with CMOS-compatible process using SOI wafer. The p-i-n electro-optic phase shifters were formed in OPA channels for transversal beam-steering. With an array pitch of 2 μm, we attained transversal steering up to 45.6° at 1550 nm wavelength. For longitudinal beam-steering, we employed thermo-optic tunable grating radiators with p-i-n junction. The i-region covers whole radiator array and the p- and n-doped regions are placed on the both sides of the radiator array. This structure can provide fairly uniform heating of the radiator region, shifting the overall radiation field in longitudinal direction by the thermo-optic effect. As a result, a longitudinal beam-steering up to 10.3° was achieved by forward-biasing with a power consumption of 178 mW. This result proves a possibility of wide two-dimensional beam-steering with one-dimensional OPA without using tunable light source. We confirmed that the longitudinal tuning range obtained above is corresponding to near 100 nm wavelength tuning. Our device scheme can be a cost-effective solution of the OPA and also be a solution of self-adjustment for fluctuation of the wavelength-dependent performances.

Paper Details

Date Published: 14 March 2018
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Proc. SPIE 10537, Silicon Photonics XIII, 105370I (14 March 2018); doi: 10.1117/12.2291515
Show Author Affiliations
Seong-Hwan Kim, KAIST (Korea, Republic of)
Geumbong Kang, KAIST (Korea, Republic of)
Jeongyoon Kim, KAIST (Korea, Republic of)
Dae-Seong Lee, KAIST (Korea, Republic of)
Nam-Hyun Kwon, KAIST (Korea, Republic of)
Jong-Bum You, KAIST (Korea, Republic of)
Dong-Eun Yoo, National Nanofab Ctr. (Korea, Republic of)
Dong-Wook Lee, National Nanofab Ctr. (Korea, Republic of)
Yun-Gi Ha, KAIST (Korea, Republic of)
Chan-Hyun Youn, KAIST (Korea, Republic of)
Kyungsik Yu, KAIST (Korea, Republic of)
Hyo-Hoon Park, KAIST (Korea, Republic of)


Published in SPIE Proceedings Vol. 10537:
Silicon Photonics XIII
Graham T. Reed; Andrew P. Knights, Editor(s)

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