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