Abstract
We present a PAM-4 optical modulator driver for Mach-Zehnder modulator (MZM), having the level pre-distortion functionality so that the ratio of level mismatch (RLM) can be optimized. The driver employs a newly proposed PAM-4 stacked source-series terminated (SST) structure with impedance control so that it can provide high output voltage swing with low power consumption. A prototype chip including data generators and serializers is fabricated in 28-nm CMOS technology with 0.016 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> active chip area. With this, 28-Gb/s operation is achieved with 2.4 V differential output swing and 3.14 pJ/bit energy efficiency. It is experimentally demonstrated that our circuit can achieve larger than 95% RLM for a commercial LiNbO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> MZM PAM-4 modulation.
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