Dear Esteemed Participants, Colleagues, and Friends,

On behalf of the Organizing Committee, it is our great pleasure to welcome you to the International Conference on Optical and Terahertz Communications and Future Networks (OTCN 2025), held in the vibrant city of Tokyo, Japan, from September 26–28, 2025.

This inaugural conference brings together a global community of researchers, engineers, industry leaders, policymakers, and innovators to explore groundbreaking advancements and foster collaborations in the dynamic fields of optical and terahertz communications, future network architectures, and their transformative applications. As we stand at the cusp of a new era in connectivity and technology, OTCN 2025 serves as a pivotal platform to address the challenges and opportunities shaping the next generation of communication systems.

The conference’s six core tracks—Optical Communications and Networking (T1), Terahertz Communications and Networking (T2), Future Networking Architectures (T3), Emerging Optical & THz Technologies (T4), Standards and Policy (T5), and Applications and Use Cases (T6)—reflect the interdisciplinary nature of our field. Through keynote speeches, technical sessions, and interactive workshops, we aim to bridge theoretical research with real-world implementation, driving innovation from labs to markets.

Tokyo, a city synonymous with technological excellence and cultural richness, provides the perfect backdrop for this exchange of ideas. We encourage you to engage deeply with peers, explore synergies across disciplines, and contribute to shaping a sustainable and inclusive digital future.

We extend our heartfelt gratitude to all authors, reviewers, sponsors, and partners whose dedication has made OTCN 2025 possible. A special thanks to our Technical Program Committee for curating a world-class agenda, and to our attendees for bringing your expertise and passion to this global forum.

Whether you are here to present pioneering research, discover emerging trends, or build lasting partnerships, we hope your experience at OTCN 2025 will inspire new ideas, spark collaborations, and propel our collective mission forward.

Welcome to Tokyo—where tradition meets tomorrow. Let’s embark on this exciting journey together!
Warm regards,
The Organizing Committee of OTCN 2025
Tokyo, Japan