Credo flies Seagull 200 PAM4 optical DSP

Feb. 25, 2021
The Seagull 200 will support the design of QSFP56 optical transceivers for 200 Gigabit Ethernt (GbE) SR4, DR4, FR4, and LR4 applications.

Credo now offers the Seagull 200 (CFD50502) Optical DSP, based on the company’s SEAGULL Platform (see, for example, "Credo targets Seagull 50 PAM4 DSP toward 5G optical modules"). The Seagull 200 will support the design of QSFP56 optical transceivers for 200 Gigabit Ethernt (GbE) SR4, DR4, FR4, and LR4 applications.

The Seagull 200 features a four-lane client-side electrical interface, with each lane transmitting 53.125-Gbps (26.5625 Gbaud) PAM4, and a four-lane optical line side interface that operates at the same transmission rate. The device integrates a DSP engine and equalization techniques to compensate for optical impairments while achieving good BER performance at low power dissipation. The architecture enables minimal and deterministic latency, making it suitable for latency-sensitive applications such as mobile infrastructure, Credo adds.

Other features include diagnostics and loopback features as well as a footprint compatible with Credo’s Dove 200 Optical DSP. Customers thus can design a common PCB for either component then choose the DSP that better meets the application requirements.

“Seagull 200 is the ideal high-performance and low-power DSP for data centers and for 5G wireless mid-haul and back-haul deploying PAM4 networks,” said Scott Feller, vice president of marketing at Credo. “The low power and fixed latency enable 200G upgrades on the next-generation wireless networks.”

“Radio access network [RAN] architectures are undergoing a significant change, driving higher bandwidth demands for front haul and mid haul connections,” added Chris DePuy, technology analyst at 650 Group, via a Credo press release. “For those new, distributed RAN systems to keep up with 5G wireless demand, high-speed optical interfaces to connect radios and baseband systems are critical. Additionally, we see other applications for 200GbE optical systems in edge cloud systems, which will drive additional volume that will reduce unit costs.”

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