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