53Gbps per Lane Optical DSP

Seagull 152

Seagull 152 (CFD33202) is a versatile full-duplex device that can be used in next generation 2x50Gbps QSFP28, SFP-DD or DSFP optical transceivers or active optical cables (AOCs) for hyperscale data centers. It supports 100Gbps SR2/DR2/FR2/LR2/ER2 applications using PAM-4 modulation.

Seagull 152 includes integrated VCSEL, EML and silicon photonics (SiPho) drivers and comes with a full suite of features including Credo’s industry-leading energy efficiency. Together with Credo’s new Teal 200 TIA (Transimpedance Amplifier), the Seagull 152 device enables a complete an optical transceiver chipset for low-power, cost-effective, high-performance hyperscale, AI, and 5G applications.

Seagull 152 includes Credo’s fourth generation digital signal processing technology on the electrical host side and optical line side. This allows for extended host side reach supporting seamless operation over short and long PCB channels outside of the standard VSR specifications without having to modify the device settings. On the optical side, the latest performance enhancements allow customers to relax the optical component specifications, therefore increasing optics yields and lowering the cost.

Credo Seagull152 blockdiagram


Host Side
2 x 53G PAM-4
Line Side
2 x 53G PAM-4
Operating Temperature
0° to 85°C


  • Fourth generation DSPs on optical side and electrical side deliver industry leading sensitivity and BER performance, providing margin for component variation and high-volume manufacturing
  • Line side Rx performance enhancing features specific to optical link and component impairments
  • Integrated VCSEL drivers with programmable laser currents
  • Integrated EML and SIPho drivers with programmable output swing and equalization
  • High-performance transmitters come with multi-tap FIR filters, allowing precision optimization at both the module electrical connector and optical interface
  • Host side interface supports extended PCB reach without the need for customized per-channel settings
  • Independent phase locked loops per channel support flexible breakout configurations including 2x50G and 1x100G
  • Full suite of test features and loopbacks simplifies lab bring up and production testing to reduce time-to-market
  • Low-power dissipation enables higher rack utilization and lower thermal cooling requirements
  • Can be used with Credo’s Teal 200 TIA for a complete optical chipset solution

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