Wide-Temperature-Range (25°C to 80°C) 53-Gbaud PAM4 (106-Gb/s) Operation of $1.3-\mu \mathrm{m}$ Directly Modulated DFB Lasers for 10-km Transmission

Clear eye-openings were obtained for 53-Gbaud PAM4 (106-Gb/s) operation from 25°C to 80°C for the first time by using a newly developed $1.3-\mu m$ directly modulated DFB laser. Open eyes were successfully demonstrated after a 10-km SMF transmission.

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