Beat frequency generation up to 3.4 THz from simultaneoustwo-mode lasing operation of sampled-grating DBR laser

Abstract
Simultaneous two-mode lasing operation for 0.56 – 3.4 THz beat signal generation is achieved from a single sampled-grating DBR laser by simply controlling the bias current. A high autocorrelation modulation depth and > 30 dB suppression of the other cavity modes is demonstrated.