High performance tunnel injection quantum dot comb laser

Abstract

A high-speed multiwavelength quantum dot comb laser, grown by molecular beam epitaxy, is demonstrated. The device is characterized with a 75.9 nm (full width at half maximum) and a 91.4 nm (Δ−15 dB) wide lasing spectrum. There are 105 and 185 simultaneously emitted longitudinal modes with a maximum channel intensity nonuniformity of less than 3 dB in the spectral range of 1231–1252 nm and 1274–1311 nm, respectively, for a laser with 1040 μm cavity length. The channel spacing can be tuned with cavity length and remains invariant in the temperature range of 300–323 K. The small signal modulation bandwidth is 7.5 GHz.