External grating tunable MQW laser with wide tuning range of 240 nm

Abstract

A very wide tuning range in an external grating tunable InGaAs/InGaAsP MQW laser is demonstrated. Second subband recombination occurs in MQW diode at high current density injection. This contributes to gain expansion and a tuning range of 240 nm was obtained when operated continuously (CW) at room temperature.