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14 March 2018 Two-dimensional beam-steering using 1x16 silicon optical phased array with thermo-optic tunable grating radiators (Conference Presentation)
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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Proceedings Volume 10537, Silicon Photonics XIII; 105370I (2018) https://doi.org/10.1117/12.2291515
Event: SPIE OPTO, 2018, San Francisco, California, United States
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.
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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, and Hyo-Hoon Park "Two-dimensional beam-steering using 1x16 silicon optical phased array with thermo-optic tunable grating radiators (Conference Presentation)", Proc. SPIE 10537, Silicon Photonics XIII, 105370I (14 March 2018); https://doi.org/10.1117/12.2291515
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KEYWORDS
Thermal optics
LIDAR
Electro optics
Phase shifts
Phased array optics
Silicon
Light sources
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