Semipolar ( 20 21 ¯ ) InGaN/GaN micro-photodetector for gigabit-per-second visible light communication

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<jats:title>Abstract</jats:title> <jats:p>This paper investigated the use of semipolar InGaN/GaN multiple quantum well based micro-photodetectors (<jats:italic>μ</jats:italic>PDs) as the optical receiver for visible light communication (VLC). The fabricated semipolar <jats:italic>μ</jats:italic>PDs exhibited a low dark current of 1.6 pA at −10 V, a responsivity of 0.191 A W<jats:sup>−1</jats:sup>, and a −3 dB modulation bandwidth of 347 MHz. A high data rate of up to 1.55 Gbit s<jats:sup>−1</jats:sup> was achievable by utilizing the extended bandwidth of more than −10 dB, and based on a straight-forward non-return-to-zero on–off keying modulation scheme. This development demonstrated the feasibility of wavelength-selective detection scheme using semipolar <jats:italic>μ</jats:italic>PD for high-data-capacity VLC systems.</jats:p>

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