A 50 Gb/s PAM-4 VCSEL Transmitter With 2.5-Tap Nonlinear Equalization in 65-nm CMOS

Abhinav Tyagi,Takayuki Iwai,Kunzhi Yu,Binhao Wang,Wayne V. Sorin,Sagi Varghese Mathai,Michael Tan,Samuel Palermo

IEEE Photonics Technology Letters（2018）

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摘要

Utilizing four-level pulse-amplitude modulation (PAM-4) with vertical-cavity surface emitting lasers (VCSELs) is challenging due to device nonlinearity and bandwidth limitations. This letter presents a VCSEL-based PAM-4 transmitter that employs a 2.5-tap nonlinear equalizer to compensate for these issues. The transmitter utilizes lookup-table control of a current-mode digital-to-analog converter (...

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关键词

Vertical cavity surface emitting lasers,Optical transmitters,Equalizers,Bandwidth,Clocks,Table lookup,Modulation

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