About Featured Expert: Xscape Photonics

Xscape Photonics develops silicon-photonics technologies for optical connectivity within artificial intelligence and high-performance computing systems. Its work centers on the movement of data among processors, memory and networking infrastructure, where the increasing scale of accelerated computing is placing greater demands on bandwidth, reach, component density and power efficiency. Rather than addressing the computing devices themselves, the company focuses on the photonic links used to connect them within data-center systems.

As AI clusters expand, large numbers of processors must exchange data rapidly across several levels of the computing architecture. These connections may include short-reach links within a system, communication among adjacent computing nodes and longer connections across a data-center fabric. Electrical interconnects remain important within these environments, but their practical constraints become more pronounced as data rates and transmission distances increase. Optical interconnects provide another means of carrying these data streams while supporting the higher bandwidth densities required by emerging computing architectures.

Xscape-Photonics-Featured-Expert-logo-–-Photonics-Industry-MonthlyXscape Photonics applies silicon photonics and nonlinear optical techniques to the development of multi-wavelength light sources for these interconnects. The underlying approach uses a common pump laser to generate multiple optical wavelengths on a silicon-photonic platform. Each wavelength can serve as a separate communications channel, allowing several data streams to be transmitted through the same fiber by wavelength-division multiplexing. This makes the light source, wavelength plan and associated photonic components part of a coordinated optical interface rather than a collection of independent channels.

The technology is intended to operate with modulators, detectors, waveguides and other elements used in silicon-photonic transceivers and optical engines. Its programmable wavelength structure can support different channel counts and wavelength spacings for coarse or dense wavelength-division multiplexing. This flexibility is relevant because AI and high-performance computing systems do not rely on a single interconnect format: optical components may be deployed in pluggable modules, placed near a processor package or integrated more closely with switching and computing hardware.

By generating several wavelengths from one external optical pump, the architecture is also designed to reduce the number of discrete laser sources and related optical connections required for a multi-channel link. The potential system considerations extend beyond fiber capacity to component count, optical packaging, assembly and the distribution of light among multiple endpoints. These are significant engineering factors as manufacturers work to increase data throughput without proportionally increasing the size, power requirements and complexity of the optical subsystem.

Xscape Photonics applies this work to scale-up, scale-out and broader data-center network fabrics. Scale-up links connect computing resources within tightly coupled systems, while scale-out networks connect larger numbers of computing nodes. The company also addresses optical connectivity between processors and memory, an area in which data movement can limit the effective performance of otherwise powerful computing hardware. Its expertise therefore spans the light-source technology, silicon-photonic integration and system-level interconnect requirements associated with high-bandwidth computing.

Founded from silicon-photonics research conducted at Columbia University, Xscape Photonics maintains operations in Fort Lee, New Jersey, and Santa Clara, California. Its technical team brings together experience in nonlinear photonics, optical-frequency-comb generation, silicon-photonic devices, semiconductor integration and data-center communications. To learn more about Xscape Photonics and its work in optical interconnect technology, please click here.

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Molly Bakewell Chamberlin
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