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1.6T

TDECQ Explained: How to Interpret PAM4 Transmitter Quality from 100G to 800G

Apr 14, 2026 Rajesh Shekhawat

TDECQ (Transmitter and Dispersion Eye Closure Quaternary) is the IEEE-standard metric for evaluating PAM4 optical transmitter signal quality across 50G to 1.6T. This guide covers how TDECQ is calculated, IEEE compliance limits by application, how to read datasheet values, and what the numbers mean for your link budget and real-world deployments.