1.35 /spl mu/m intersubband transition in InGaAs/AlAsSb single quantum wells

Room temperature, polarisation resolved absorption spectral measurements on InGaAs/AlAs/AlAsSb single quantum wells to report an intersubband absorption peak at a wavelength as short as 1.35 /spl mu/m are presented. The observed absorption peak covers the communication wavelength range of 1.2 to 1.6 pm.