Kota Nishiyama, Mayuri Nakagawa, Kohjun Koshiji, Masahiro Nakagawa, Hiromitsu Imai, Kenichi Hitachi, Tomoya Akatsuka, Katsuya Oguri, Rie Hayashi: Exploring High-Precision Transmission of Optical Reference Frequencies via Wavelength Division Multiplexing. HPSR 2025: 1-6