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DesignCon 2019 Presentation Viewer

Welcome to the DesignCon Presentation Store. Here you can view and download conference and/or show floor theater presentations before, during, and after the event. If you’re looking for a presentation from a specific session that you’re unable to find here, note that it’s likely because the presenter has not provided permission for external use or has not yet shared their presentation with us. Please check back after the event for a more complete catalogue of available presentations.

TDECQ for PAM4 Optical Transmitters: Does it Really Work?

Greg LeCheminant (Engineer, Keysight)

Location: Ballroom F

Date: Wednesday, January 30

Time: 10:00am - 10:45am

Track: 03. Integrating Photonics & Wireless in Electrical Design, 13. Applying Test & Measurement Methodology

Session Type: Technical Session

Vault Recording: TBD

Audience Level: All

The use of PAM4 and forward error correction led to dramatic changes in the test methods used to characterize optical transmitters used in digital communications systems. TDECQ (transmitter dispersion and eye closure quaternary) is the primary example of this change. Does the measurement really provide the results it was intended to yield, specifically the power penalty metric needed to predict how well a transmitter will operate in a real system. This paper will try to document when it does and when it does not


If you are required to use the TDECQ method, you will understand what is going on 'underneath the hood' and what is required to achieve a reliable and useful metric.

Intended Audience

A basic familiarity with optical digital communications and common measurements like bit-error-ratio and eye diagram analysis is helpful but not required