[10a-W331-1~10] CS.4 3.15 シリコンフォトニクス、3.16 Optics and Photonics English Sessionのコードシェアセッション

▲ [10a-W331-4] Investigation of Si Sidewall Bragg Grating for Hybrid III-V/SOI DFB Lasers

〇(M2)Moataz Eissa¹、Takuya Mitarai¹、Fumihitio Tachibana¹、Nobuhiko Nishiyama^1,2、Shigehisa Arai^1,2 (1.Titech EEE Dept.、2.Titech FIRST)

キーワード：Silicon photonics, Hybrid laser, Bragg grating

LiDAR (Light Detection and Ranging) is extending its role in many applications such as autonomous cars and drones. We are developing a one-chip FMCW LiDAR system on Silicon photonics platform using slow-light grating couplers and hybrid lasers [1]. In this system, a tunable 1.55-µm DFB laser with <1-nm tuning range, ~100-kHz scanning speed, while maintaining high power (>100 mW) and narrow linewidth (~few hundred kHz), is required. Distributed feedback via sidewall Bragg grating structure patterned on the sidewalls of the Si waveguide is concerned in this study rather than the conventional top-etched one so as to reduce process complexity and avoid possible thermal issues. In this report, 2-µm-width Si waveguide sidewall Bragg grating was fabricated to check the deviation between design and measurement in terms of the mode coupling coefficient (κ) and scattering loss (α_s) as a step towards such DFB lasers.