120°C, 25.8-Gbps operation of 1.3-µm directly modulated InGaAlAs-MQW DFB lasers

High-temperature 25.8-Gbps clear-eye-opening of a 1.3-µm directly modulated InGaAlAs-MQW DFB laser with ACPM grating was demonstrated up to 120°C for the first time. Furthermore, the eye openings showed high mask margins of more than 19% from 25 to 110°C.