Wang, Rui. “A Circuit-Level Implementation of Voltage-Tuning Scheme for Realizing Optical PAM-4 Using Three-Segment Microring Modulator”. International Journal of Engineering and Technology Innovation 10, no. 2 (April 1, 2020): 91–106. Accessed March 28, 2024. https://ojs.imeti.org/index.php/IJETI/article/view/5072.