Yudai Uchida, Tsubasa Ishikawa, Itsuki Urashima, Shoma Murao, Takahiro Kodama, Yasuki Sakurai, Ryuichi Sugizaki, Masahiko Jinno: Core Selective Switch Supporting 15 Cores Per Port Using Bundled Three 5-Core Fibers. OFC 2022: 1-3