LOW-THRESHOLD AND NARROW-LINEWIDTH 1.5-MU-M COMPRESSIVE-STRAINED MULTIQUANTUM-WELL DISTRIBUTED-FEEDBACK LASERS

1.5-mu-m compressive-strained multiquantum-well distributed-feedback lasers have been fabricated and characterised. 5.5 mA threshold current, 1 MHz mW linewidth-power product, and 600 kHz minimum linewidth were measured on 500-mu-m long devices. Measured threshold current as low as 2.2 mA was also obtained on 150-mu-m long devices. Both low threshold and narrow linewidth are attributed to the reduced transparency current and linewidth enhancement factor due to the effect of strain.