In this paper, a high-precision bidirectional time-transfer system over a single fiber based on wavelength-division multiplexing and time-division multiplexing (SFWDM-TDM) is proposed, which combines the advantages of wavelength-division multiplexing and time-division multiplexing. It uses two. The WDM system supports two transmission modes: single-fiber unidirectional and single-fiber bidirectional. Simple design and low requirements. Easy fault isolation. TOKYO, May 26, 2026 -- As part of the Ministry of Internal Affairs and Communications-commissioned research and development project, "Research and Development (JPMI00316) of Advanced Optical Transmission Technology Contributing to a Green Society", Oki Electric Industry Co. (OKI), Lightera. BiDi SFP (Bidirectional Small Form-Factor Pluggable) transceivers have emerged as a powerful solution, enabling full-duplex communication over a single optical fiber. BiDi transceivers change the math by.
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