Compact Monitor device for Multicore Fibre with Practically Low loss using Multiple Lenses. - Taketoshi Takahata; Asumi Kaya; Sayaka Nagayama; Tetsuya Kobayashi (ECOC, 2020)

High Reliability Fan-in / Fan-out Device with Isolator for Multi-core fibre Based on Free Space Optics. - Taketoshi Takahata; Asumi Kaya; Yuta Ozawa; Yousuke Minagawa; Tetsuya Kobayashi (ECOC, 2021)

High-isolation and Low-crosstalk Optical-circulator-based 2-core Fan-out Device. - Yuta Wakayama; Asumi Kaya; Ikuya Saji; Shohei Beppu; Kosuke Komatsu; Daiki Soma; Taketoshi Takahata; Tetsuya Kobayashi; Lídia Galdino; Kevin Bennett; Sergejs Makovejs; Noboru Yoshikane; et al. (OFC, 2025)