Selective Filtering and Amplification of THz-Range Optical Signals With an On-Chip Multi-Wavelength DBR Laser

The growing demand for higher data transmission rates and the increased use of THz signals for spectroscopy and sensing application motivates interest in mm-wave and THz technologies [1]. High-capacity THz wireless communications systems, among others require the ability to manipulate and process such signals. But, due to the limited bandwidth of electronics systems, photonic-based solutions are promising to enable THz-optical-THz conversion, bringing the processing to the optical domain [2]. In this work, using an on-chip photonic system, we demonstrate narrowband filtering and amplification of optical signals that could be directly applied to THz all-optical signal processing.