Patent ID: 7933524

Claim:
An apparatus for generating millimeter waves, the apparatus comprising: a mode-locking LD (laser diode) which has a DFB (distributed feedback) sector acting solely as a reflector without generating a mode and a gain sector and generates high-frequency optical pulses through a passive mode locking, wherein the passive mode locking process is performed by applying a current that is lower than a threshold current of the mode-locking LD to the DFB sector, wherein the mode-locking LD comprises a phase control sector between the DFB sector and the gain sector, and wherein the millimeter waves are generated using a high-order harmonic pulse among the optical pulses generated in the mode-locking LD; a modulator which modulates an external optical signal using an electric signal and injects the modulated optical signal to the mode-locking LD to lock the optical pulses; and an RF (radio frequency) locking signaling unit which injects the electric signal to the modulator.