High Speed Directly Modulated Fabry-Perot Lasers With an Ultra-Short Cavity Length

In this study, Fabry-Perot quantum well lasers with shortened cavity designs (25 and
$50~\mu $
m) were fabricated. The devices had dry-etched and cleaved facets and exhibited an output power of up to 2.36 mW for a cavity length of 25
$\mu $
m; good spectral performance was achieved. Single-optical-mode operation with better than 25dB of side mode suppression ratio can be achieved for the fabricated devices with 25- and 50-
$\mu $
m cavities. The short-cavity devices also exhibited high-speed modulation at elevated temperatures. Moreover, 25 Gb/s eye diagrams could be obtained at 65°C for the 25
$\mu $
m device and 55°C for the 50
$\mu $
m device. Due to their small area, ultra-short-cavity Fabry-Perot laser can be suitably used in next-generation light sources for optical communication.