Conference Introduction The 2nd International Conference on Optical and Terahertz Communications and Future Networks (OTCN 2026) will be held in Singapore, from September 11-13, 2026 (hybrid both in person and online). Building on the success of the first edition held in Japan, OTCN 2026 will continue to bring together leading researchers, engineers, industry experts, and innovators from across the globe to share groundbreaking work and foster collaboration in optical and terahertz communications, future network systems, and emerging applications. We warmly invite submissions worldwide to shape the future of communication technologies. Main Topics The topics of interest include, but are not limited to: T1: Optical Communications and Networking T2: Terahertz Communications and Networking T3: Future Networking Architectures T4: Wireless and Mobile Communications T5: Emerging Communication Technologies T6: Applications, Security and Standards OTCN 2026 Publication Papers submitted to OTCN 2026 will be reviewed by conference committees. Accepted and presented papers will be included in OTCN 2026 Conference Proceedings published by SPIE, and submitted for inclusion in major databases such as EI Compendex and Scopus. Important Dates Submission Due: July 27, 2026 Notification Due: August 10, 2026 Registration & Payment Due: August 17, 2026 Conference Date: September 11-13, 2026 Submission Guidelines All papers or abstracts should be submitted by OpenConf System or Email. Please choose one of them to submit your research work. Submission System: http://otcn.cc/openconf Email: cfp@otcn.cc Contact Conference Secretary: Nataly Du Email: cfp@otcn.cc WhatsApp/Wechat: +86-13917384869 Website: www.otcn.cc