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Performance Comparison Between QSFP-DD & OSFP for 56G-PAM4 Applications

Xu Jiang  (Senior SI Engineer, Luxshare-Ict)

Hong Ahn  (SerDes Designer, Xilinx)

Kelvin Qiu  (senior technical member of the Cisco Switching Product group, Cisco)

Andy Nowak  (Luxshare-ICT)

Melvin Li  (Senior SI Engineer, Luxshare-Ict)

Geoff  (Distinguished Engineer and Supervisor of Transceiver Architecture and Modeling Team, Xilinx)

Location: Ballroom B

Date: Thursday, January 30

Time: 2:00pm - 2:40pm

Track: 07. Optimizing High-Speed Serial Design, 08. Measurement, Simulation & Improving Jitter, Noise & BER (Pre & Post FEC)

Format: Technical Session

Pass Type: 2-Day Pass, All-Access Pass, Alumni All-Access Pass - Get your pass now!

Vault Recording: TBD

Audience Level: Intermediate

The two form factors, QSFP-DD and OSFP, are co-existing in the industry in both standards as well as field applications. This paper provides the detailed comparative study which can serve as the general guidelines for system engineers to apply them in current and future designs. First, the QSFP-DD and OSFP copper cable assembly performance in terms of insertion loss, return loss, and crosstalk are presented. End-to-end channel s-parameters are constructed. Then, COM is used to analyze the link performance for 56G-PAM4 applications. Finally, lab measured data based on a 56G-PAM4 SerDes with all 8 lanes running is discussed, with and without crosstalk.


QSFPDD and OSFP are introduced to the audience focused on system level signal integrity for 56G-PAM4 applications. The audience will walk away with the knowledge of the two form factors' pros and cons, and the general reference guidelines for what form factor to choose for the next generation of product designs.

Intended Audience

1. Basic concept high speed serial link systems, including transmitter, channel, and receiver
2. Basic understanding system performance evaluation and analysis
3. Basic knowledge of channel s-parameter description, including insertion loss, return loss, crosstalk, etc.

Presentation Files