E-mail Alert
RSS2018 Vol. 1, No. 3
Cover Story： Cheng C H, Shen C C, Kao H Y, Hsieh D H, Wang H Y et al. 850/940-nm VCSEL for optical communication and 3D sensing. Opto-Electron Adv 1, 180005 (2018).
As the main transmitter for the intra-data-center link, the 850-nm vertical cavity surface emitting laser (VCSEL) array module is standardized toward 100/200/400 Gbps or beyond, which effectively increases the cloud transmission rate in data centers to meet the urgent demands on huge amount of audio/video/data exchange and streaming nowadays. Three teams from Taiwan University and Chiao Tung University review the state-of-the-art of the high-speed 850/940-nm VCSEL, discussing the structural design, mode control and the related data transmission performance. InGaAs/AlGaAs MQW was used to increase the differential gain and photon density in VCSEL. The multiple oxide layers and oxide-confined aperture were well designed in VCSEL to decrease the parasitic capacitance and generate single mode (SM) VCSEL. The maximal modulation bandwidth of 30 GHz was achieved with well-designed VCSEL structure. Other applications of the near-infrared VCSELs are discussed at the end of the paper.
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Prof. Xiangang Luo
