16nm 400GbE PAM-4 PHY (16:8) or (8:8)

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The Broadcom BCM81188 is a single-chip, low-power, low-latency PAM-4 PHY that integrates retimer and qualizer functions to support 400GbE applications.  In 400GbE mode, the BCM81188 converts 16 × 25G NRZ or 8 × 50G PAM-4 host side into 8 × 50G PAM-4 line side to drive optical PAM-4 links inside next generation modules, including CFP8. The BCM81188 is compliant to 400G data in accordance with IEEE 802.3bs standards.  The device also supports Broadcom's proprietary high gain Super-FEC (S-FEC) for extended reach applications. The BCM81188 supports both 400G and Quad 100G modes. On-chip clock synthesis is performed by a low-cost 156.25 MHz reference clock via high-frequency, low-jitter phase-locked loops (PLLs). The BCM81188 is fabricated in advanced low-power 16 nm CMOS technology and is available in a RoHS-compliant package.


  • 400GbE (8 × 50G PAM-4) PHY
  • Host side: 16 × 25G NRZ or 8 × 50G PAM-4
  • Line side: 8 × 50G PAM-4
  • 400G PCS data from the client side 
  • CEI-28G/56G MR compliant  
  • Integrated host side AC-coupling caps 
  • Line-side and client-side loopbacks
  • Pin-to-pin compatible to BCM82254
  • IEEE 802.3bs standard-compliant FEC
  • Proprietary high gain Super-FEC (S-FEC) 
  • Supports both MMF & SMF fiber links 
  • Low-power 16 nm CMOS design


  • 400GbE (8 × 50G) PAM-4 links for MMF/SMF
  • 400GbE CFP8 modules

Lifecycle Status


Specification Value
Lifecycle Active
Distrib. Inventory No
PHY Type 100GE
Product Brief28 i