Carrier Frequency Offset Estimation Using Godard Timing Recovery in Coherent Optical Systems. - Trung-Hien Nguyen; Sami Mumtaz; Abel Lorences-Riesgo; Martí Sales-Llopis; Clement Jauffret; Celestino Sanches Martins; Zhihang Wu; Yann Frignac; Gabriel Charlet; Yu Zhao (OFC, 2024)