All-optical feedforward automatic gain control scheme for pump power shared erbium-doped fiber amplifiers. - Kokoro Kitamura; Kenta Udagawa; Hiroji Masuda (IEICE Electron. Express, 2016)

Optically Amplified Feedback Circuit with High Improvements in Optical Power Resolution. - Hiroji Masuda; Kokoro Kitamura; Syful Islam; Biswajit Biswas (OECC/PSC, 2019)

First experimental demonstration of all-optical feedforward automatic gain control scheme using a semiconductor optical amplifier. - Kokoro Kitamura; Hiroji Masuda (IEICE Electron. Express, 2019)

Amplified-spontaneous-emission feedback circuit with wide operating bandwidth and dynamic range. - Biswajit Biswas; Md Golam Barkatul Abrar; Kunihiro Tanaka; Ryuga Harada; Kokoro Kitamura; Hiroji Masuda (IEICE Electron. Express, 2023)

Guided spontaneous emission circuit technique with improved optical power resolutions for optical power variation measurement. - Kokoro Kitamura; Md Golam Barkatul Abrar; Kunihiro Tanaka; Ryuga Harada; Hiroji Masuda (IEICE Electron. Express, 2025)