Study on Robustness to Optical Diffusion on Undersea Optical CDMA System Using 2D Optical ZCZ Sequences - Koichiro Mizozoe; Takahiro Matsumoto; Yasuaki Ohira; Hideyuki Torii; Yuta Ida (12th IEEE Global Conference on Consumer Electronics, GCCE 2023, Nara, Japan, October 10-13, 2023, 2023)