PCI-SIG introduces industry standard for PCIe over optical fiber

PCI-SIG has unveiled a significant amendment to its PCI Express (PCIe) technology portfolio, announcing an optical interconnect specification that leverages fiber optics to drive PCIe performance to new heights. The update, known as the Optical Aware Retimer Engineering Change Notice (ECN), updates both the current PCIe 6.4 specification and the upcoming PCIe 7.0 specification. At its core, this ECN introduces for the first time a standardized method for transporting PCIe signals over long distances using optical fiber, enabled through a retimer-based approach.

The optical aware retimer solution directly addresses growing demand for modular, high-speed, and long-reach PCIe connectivity. Data center requirements—particularly those involving Artificial Intelligence, machine learning, and cloud computing—have long outpaced traditional copper cabling´s reach and speed limitations. By standardizing PCIe over fiber, PCI-SIG is offering a future-proof connectivity path for environments where bandwidth, distance, and reduced signal degradation are paramount.

According to Al Yanes, PCI-SIG president and chairperson, the new specification responds to a clear market need for optical PCIe interconnects. While initial rollouts are expected within data center applications, especially those supporting Artificial Intelligence and cloud workloads, Yanes believes the modular nature of the optical solution will eventually unlock innovative PCIe use cases beyond current horizons. As the cost and availability of PCIe optical solutions improve over time, market adoption is expected to expand, introducing high-speed fiber-based PCIe to a wider array of computing segments.