NVIDIA's co-packaged optics (CPO) switches with integrated silicon photonics are the world's most advanced networking solution for the era of agentic AI. This 4Q25 report is a continuation of and update to Cignal AI's previous OCS reports. Since the report's last publication in January 2025, and the webinar Optical Circuit Switching for AI Scaling and Datacenter Automation in July 2025, the OCS forecast has been updated based on newer information. We lead the industry in optical switch technology, delivering the lowest insertion loss (0. 2 dB), fastest switching speed (10 ns), broadest wavelength range (300–2400 nm), widest fiber compatibility, highest optical power handling (50 W), and space-qualified reliability. A selection of high damage threshold, acousto-optic Q-switches is available. Also available are. Co-packaged optics (CPO) technology, a key enabler for next-generation data center architectures, promises unprecedented bandwidth density and power efficiency by tightly integrating optical engines with switch silicon. But after nearly a decade of existence, where does this next-generation optical. Use 25+ X-Series applications to analyze, demodulate, and troubleshoot signals across wireless, aerospace/defense, EMI, and phase noise.