Terahertz frequency generation with monolithically integrated dual wavelength distributed Bragg reflector semiconductor laser diode

Continuous Wave THz System Based on an Electrically Tunable Monolithic Dual Wavelength Y-Branch DBR Diode Laser

“…The collimated beam from the diode was coupled into a polarisation maintaining single mode fiber for spectral analysis. For THz measurements, a coherent homodyne scheme was employed to generate and detect the emitted THz radiation as described in more detail in our previous work [13,14]. The THz emitter and receiver photomixer chips are fiber-coupled ion-implanted gallium arsenide (GaAs) self-complimentary logarithmic spiral photoconductive antennas with interdigitated finger electrodes manufactured by defect engineering technology on GaAs substrate [16].…”

“…In contrast, in this work, the laser operates at both wavelengths simultaneously in order to generate THz radiation. Previously, we published the generation of single frequency THz radiation at 300 GHz with a non-tunable two-colour laser [13,14]. In this work, we introduce a tunable two-colour DBR laser and study the tuning behaviour of the THz system at difference frequencies between 100 and 300 GHz by implementing the laser into a standard homodyne THz setup.…”

Near Infrared Diode Laser THz Systems

“…Moreover, the use of photonic oscillators makes it possible to achieve very high data rates due to the achievable carrier frequencies. Up to 59 Gbit s −1 in a 10 GHz bandwidth at a carrier frequency of 325 GHz were achieved recently (Hermelo et al, 2017).…”

A monolithically integrated photonic microwave generator

“…There exists an increasing demand in utilizing tunable photonic microwave signals in cost-sensitive high-speed radar systems and high-capacity wireless network systems (such as 5G mobile communications and the Internet of Things, IOT) due to their low-loss transmission in fiber, supporting high-speed operation, wide frequency tunability, and compact size characteristics when compared with other microwave sources using electric circuits and transmitted through coaxial cables [1]. Many methods have been reported to realize tunable photonic microwave generation, including optoelectronic microwave oscillators (OEO) [2], optical phase locked loop [3], injection locking resulting in period-one oscillation [4], and monolithic dual wavelength semiconductor lasers [5,6]. Among those schemes, monolithic dual wavelength lasers provide an integrated solution with the advantages of system compactness and robustness [7].…”