Enhanced efficiency thermo-optic phase-shifter by using multi-mode-interference deviceBharat Pant, Weiwei Zhang, Denh Tran, Mehdi Banakar, Han Du, Xingzhao Yan, Callum G. Littlejohns, Graham T. Reed and David J. ThomsonEPJ Web Conf., 238 (2020) 01007DOI: https://doi.org/10.1051/epjconf/202023801007