106-Gbps PAM4 Operation at an Extinction Ratio above 3.5 dB using a Conventional Buried-Heterostructure Directly Modulated Laser. - Kosuke Shinohara; Ryosuke Miyagoshi; Yosuke Suzuki; Ryoko Suzuki; Go Sakaino; Masaaki Shimada; Keisuke Matsumoto (OFC, 2023)