News summary: Adtran announced that its FSP 3000 open line system (OLS) and coherent 100ZR+ QSFP28 transceiver will play a role in the Optical Internetworking Forum’s (OIF) interoperability demonstration at OFC 2025. The showcase marks a milestone in advancing multi-vendor, multi-rate transport with 100Gbit/s, 400Gbit/s, and 800Gbit/s pluggable optics operating over a multi-span network. Located at booth 5745 with participation from 35 member companies, the demo highlights the industry's progress in optical transport and the growing demand for flexible and energy-efficient networking solutions. “This year’s interop demo is proof that open, multi-vendor optical networking is delivering on its promise,” said Christoph Glingener, CTO of Adtran. “With our FSP 3000 OLS playing a central role, we’re demonstrating reliable, flexible transport of 100Gbit/s, 400Gbit/s, and 800Gbit/s coherent signals across a disaggregated network. This validates the readiness of 800Gbit/s technology as well as the industry’s broader shift toward flexible, vendor-neutral architectures.” The demo features Adtran’s FSP 3000 OLS transporting coherent signals across an open environment, leveraging high-resolution flexgrid and bidirectional inline amplifiers to carry multi-speed services over a 300km link. Integrated optical monitoring enhances operational simplicity, providing real-time insights into network conditions. “Now, it’s clear the industry fully embraces this vision, and we’re seeing growing momentum toward open, multi-vendor optical infrastructures,” said Ryan Schmidt, GM of optical transport at Adtran. “By demonstrating reliable, efficient transmission of multiple coherent wavelength data rates, including 800Gbit/s, we’re providing operators with a clear path to scalable networks.” About Adtran ADTRAN Holdings, Inc. is the parent company of Adtran, Inc., a global provider of networking and communications solutions that enable various communications across any infrastructure. Adtran empowers service providers and enterprises to manage and scale services connecting users worldwide. Published by ADTRAN Holdings, Inc. Contacts For media Gareth Spence +44 1904 699 358 [email protected] For investors Peter Schuman +1 256 963 6305 [email protected]