Dynamic guided spontaneous-emission circuit technique with an SNR enhancement factor of 22.5 dB for optical power variation measurement. - Hiroji Masuda; Yudai Takenouchi; Eiki Ueno; Yusuke Dokan; Seiji Uchida; Md Golam Barkatul Abrar; Kokoro Kitamura (IEICE Electron. Express, 2025)