April 5-7, 2022|Santa Clara Convention Center| Santa Clara, CA

Welcome to the DesignCon 2022 agenda and presentation download site. Here you can view and download conference, Chiphead Theater, and other event 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, it is 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 catalog of available presentations.

EMI Qualification of QSFP & OSFP Electrical/optical Modules


Philippe Sochoux  (Engineer, Juniper Networks)


David Pommerenke  (Professor, Graz University of Technology)

Federico Centola  (Engineer, Google)

Tamar Makharashvili  (Engineer, Google)

DongHyun Kim  (Professor, Missouri S&T)

Bertwin Novak  (Student, TU Graz)

Franz Gabalier  (Student, Graz University of Technology)

Xu Wang  (Student, Missouri S&T)

Xiao Li  (Engineer, Cisco)

Sameer Walunj  (Engineer, Juniper Networks)

Kaustav Ghosh  (Engineer, Juniper Networks)

Location: Ballroom E

Date: Wednesday, April 6

Time: 2:00 pm - 2:45 pm

Track: 11. Electromagnetic Compatibility & Interference, 12. Applying Test & Measurement Methodology

Format: Technical Session

Theme : Data Centers, High-speed Communications

Education Level: All

Pass Type: 2-Day Pass, All Access Pass

Vault Recording: TBD

Audience Level: All

The multitude of Electrical/Optical interfaces, such as QSFP modules, lead to the accumulation of EMI in larger routers. Levels far above the level of an individual module are reached, possibly causing unacceptable levels of EMI. To predict the EMI level of a router-like system, the EMI of individual modules needs to be measured for selecting acceptable modules. However, it is difficult to predict the level of radiation in a fully implemented system because different vendors and users have different test methods to quantify the radiation levels of modules. Neither unified test methods nor universal platforms exists. We aim to solve this problem by developing an open hardware/open software reference platform for evaluating EMI in optical modules. This platform enables reproducible measurements at data rates of up to 800 Gbit/sec. By well-designed shielding and controlled interfaces only the radiation from the module is measured. This is be accomplished by • Operating the optical module under test in a loopback mode • Providing a well shielded enclosure that only allows radiation from the optical module under test • Including a reference source having a defined radiation level that allows to verify the EMI test chamber or mode stirred chamber setup prior to the measurement of an optical module • Providing interchangeable sockets for different optical module form factors without affecting final system performance • Controlling parameters such as temperature, supplied voltage etc.


Repeatable and comparable EMI measurement of different optical modules, such as QSFP, QSFP-DD and OSFP, is made possible by the proposed optical module evaluation platform and set of measurement guidelines. Shielding and interface design suppresses other radiation. The design allows to only measure the radiation of the QSFP/OSFP module.