It is a network that enables different locations to be directly connected using optical wavelength paths and consists of Open APN Transceivers (APN-Ts), Open APN Gateways (APN-Gs), and Open APN Interchanges (APN-Is). Distributed Fiber Optic Sensing (DFOS) refers to the technology of performing multi-point real-time and continuous measurement of change environmental conditions along the entire fiber optic cable with fine spacing between the measurement points. DFOS systems monitor and rapidly report, with. The All-Photonics Network (APN) is one of the major technological fields that comprise IOWN. Most of the global internet traffic already travels through fibre optic cables, with more than ninety five percent of international data carried. Live Demonstration of Optical Connection Switching by APN-Transceiver and No Wavelength Dependance APN-Splitter for Distributed Access Network Yuya Saito, Naoki Umezawa, Yasuhiro Takizawa, Manabu Kotani, Shinya Ito, Shinichi Koyama, Yasuhiro Tanaka, and Daisuke Umeda Y. By applying this configuration to multiple routes of optical fibre for communication already laid underground (in the service area of NTT WEST in Osaka City), the. The IOWN Global Forum has proposed the Open All-Photonic Network (Open APN) as a network infrastructure that achieves low latency and low power consumption and issued an architecture document entitled “Open All-Photonic Network Functional Architecture,” in early 2022.