Abstract
Dual-mode hybrid injection-locking scheme is reported over an L-band InAs/InP quantum-dash laser to generate tunable millimeter (MMW) and Terahertz (THz) beat frequencies. In addition to the inherent enhancements that are provided by injection locking, the system provides comparable high dual-mode peak power, side mode suppression ratio (SMSR) up to 30 dB, and large beat frequency tunability of similar to 1.7 THz. As such, four different beat frequencies are demonstrated, namely 62.6- and 263-GHz MMW and 1.21- and 1.75-THz signals. The stability of the generated waves is then investigated showing a minimal fluctuation of 0.35 dB and 0.1 dB in the SMSR and peak power, respectively.