Semtech has introduced two new physical medium dependent (PMD) components that aim to set the performance bar for next-generation 1.6T multimode optical links in data centers. The GN1878 200G per channel VCSEL driver and GN1836 200G per channel transimpedance amplifier (TIA) are now available for sampling, giving hyperscalers the building blocks needed to design power-efficient 1.6T SR8 optical modules.
Why 1.6T Matters for AI Workloads
As AI training clusters grow to handle ever-larger models, intra-data-center bandwidth has become a major bottleneck. The industry is transitioning from 100G to 200G per channel technology, which enables 1.6T aggregate bandwidth in pluggable transceivers. Short-reach links such as those connecting GPUs inside a single data hall benefit from multimode optics because they offer a lower cost and lower power per bit compared with single-mode solutions.
Semtech’s latest PMD devices are designed to help module vendors deliver this bandwidth while improving energy efficiency. This is becoming a critical metric as operators face increasing power and cooling costs.
Inside the GN1878 and GN1836
The GN1878 is a vertical-cavity surface-emitting laser (VCSEL) driver optimised for multimode applications. The GN1836 is a 250 μm pitch TIA designed for high-density integration. Together, they provide the transmit and receive front-end required for SR8 optical modules while maintaining signal integrity at 200G per channel.
Semtech highlights several benefits for designers:
- Lower power per bit for short-reach connectivity
- Improved bit-error-rate margins in high-density optical links
- Seamless integration with Broadcom’s 200G VCSEL and photodetector solutions
Availability and Ecosystem
The two devices complement Semtech’s existing FiberEdge® optical portfolio and are positioned to support volume deployments starting in 2026. By collaborating with partners such as Broadcom, Semtech is aiming to deliver a complete reference solution that accelerates 1.6T multimode adoption in hyperscale environments.
Learn more and read the original release on www.semtech.com
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