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 mm2 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 LiNbO3 MZM PAM-4 modulation.
Original language | English |
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Article number | 9179707 |
Pages (from-to) | 908-912 |
Number of pages | 5 |
Journal | IEEE Transactions on Circuits and Systems II: Express Briefs |
Volume | 68 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2021 Mar |
Bibliographical note
Publisher Copyright:© 2004-2012 IEEE.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering