Credo

Circuit

<p>Credo Technology Group Holding Ltd has unveiled the Dove 850, a pioneering 800G Digital Signal Processor (DSP) Integrated Circuit (IC) optimized for Linear Receive Optics (LRO), also known as Half-retimed Linear Optics (HALO). Designed specifically for hyperscale data center AI deployments, the Dove 850 addresses the increasing demand for high-speed optical transceivers and Active Optical Cables (AOCs) crucial for interconnecting GPUs in large-scale environments.</p>
<h2 class="wp-block-heading" id="key-features-of-dove-850">Key features of Dove 850</h2>
<p>The Dove 850 is a unidirectional 8 x 112 Gb/s DSP tailored for the LRO architecture, offering a remarkable reduction in power consumption, up to 50%, compared to conventional optics. This innovation not only enhances energy efficiency but also ensures robust system performance, contributing to cost reduction – a pivotal factor in the mass production of optical components for hyperscale data centers.</p>
<p>Chris Collins, Vice President of Sales and Optical Product Marketing at Credo, emphasizes the Dove 850’s capability to reduce DSP power while providing an interoperable, easy-to-use solution for transceiver vendors. The DSP IC supports various optics, including VCSELs, silicon photonics, EML, or thin-film lithium niobate, allowing further cost optimization for module development.</p>
<h2 class="wp-block-heading" id="addressing-limitations-in-linear-pluggable-0ptics-lpo">Addressing limitations in linear pluggable 0ptics (LPO)</h2>
<p>A Dove 850-based optical transceiver aims to overcome challenges associated with Linear Pluggable Optics (LPO) by ensuring IEEE compliant optical transmit signaling. This not only facilitates deployment but also eliminates manual, per-port tuning, resulting in lower bit error rates, enhanced sensitivity, reduced performance variation, and improved resilience to different environmental conditions and components.</p>
<p>Scott Wilkinson, Lead Analyst for Optical Components at Cignal AI, acknowledges the significance of Dove 850 in expanding the market for low-power 800GbE. While Linear Pluggable Optics (LPO) faced technical limitations hindering customer enthusiasm, Dove 850’s half-retimed solution addresses these concerns and is poised to play a pivotal role in the 800GbE market.</p>
<h2 class="wp-block-heading" id="technical-benefits-of-dove-850">Technical benefits of Dove 850</h2>
<p>The Dove 850 is IEEE 802.3 and CMIS 5.x compliant, supporting 8 x 112 Gb/s PAM4 on both the electrical host receiver and optical line transmitter interfaces. The copper-optimized DSP-based electrical host side receivers deliver industry-leading sensitivity and Bit Error Rate (BER) performance. With independent Phase-Locked Loops (PLLs) for each lane, the DSP supports breakout configurations, including 2 x 400G, 4 x 200G, and 8 x 100G.</p>
<p>Dove 850’s line side transmitters boast multi-tap Finite Impulse Response (FIR) filters and non-linear correction, facilitating the use of multi-mode or single-mode optics. The independent PLLs per channel allow flexible breakout configurations. Additionally, the DSP incorporates a comprehensive suite of link diagnostic features, simplifying lab setup and production testing.</p>

Dove 850 sets a new standard in 800G DSP innovation

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