Broadband high-Q multimode silicon concentric racetrack resonators for widely tunable Raman lasers

Yaojing Zhang (), Keyi Zhong, Xuetong Zhou and Hon Ki Tsang ()
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Yaojing Zhang: The Chinese University of Hong Kong
Keyi Zhong: The Chinese University of Hong Kong
Xuetong Zhou: The Chinese University of Hong Kong
Hon Ki Tsang: The Chinese University of Hong Kong

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Multimode silicon resonators with ultralow propagation losses for ultrahigh quality (Q) factors have been attracting attention recently. However, conventional multimode silicon resonators only have high Q factors at certain wavelengths because the Q factors are reduced at wavelengths where fundamental modes and higher-order modes are both near resonances. Here, by implementing a broadband pulley directional coupler and concentric racetracks, we present a broadband high-Q multimode silicon resonator with average loaded Q factors of 1.4 × 106 over a wavelength range of 440 nm (1240–1680 nm). The mutual coupling between the two multimode racetracks can lead to two supermodes that mitigate the reduction in Q factors caused by the mode coupling of the higher-order modes. Based on the broadband high-Q multimode resonator, we experimentally demonstrated a broadly tunable Raman silicon laser with over 516 nm wavelength tuning range (1325–1841 nm), a threshold power of (0.4 ± 0.1) mW and a slope efficiency of (8.5 ± 1.5) % at 25 V reverse bias.

Date: 2022
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DOI: 10.1038/s41467-022-31244-0

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