UWB Fastly-Tunable 0.5-50 GHz RF Transmitter Based on Integrated Photonics

Currently, due to the 6G revolution, applications ranging from communication to sensing are experiencing an increasing and urgent need of software-defined ultra-wideband (UWB) and tunable radio frequency (RF) apparatuses with low size, weight, and power consumption (SWaP). Unfortunately, the coexistence of ultra-wideband and software-defined operation, tunability and low SWaP represents a big issue in the current RF technologies. Recently, photonic techniques have been demonstrated to support achieving the desired features when applied in RF UWB transmitters, introducing extremely wide operation and instantaneous bandwidth, tunable filtering, tunable photonics-based microwave mixing with very high port-to-port isolation, and intrinsic immunity to electromagnetic interferences. Moreover, the recent advances in photonics integration also allow to obtain very compact devices. In this article, to the best of our knowledge, the first example of a complete tunable software-defined RF transmitter with low footprint (i.e., on photonic chip) is presented exceeding the state-of-the-art for the extremely large tunability range of 0.5-50 GHz without any parallelization of narrower-band components and with fast tuning (<200 mu s). This first implementation represents a breakthrough in microwave photonics.

Automated summary

The 6G revolution has led to an increasing and urgent need for software-defined ultra-wideband and tunable radio frequency apparatuses with low size, weight, and power consumption. Issues in current RF technologies related to ultra-wideband and software-defined operation, tunability, and low SWaP can be addressed using photonic techniques, which also allow for very compact devices through recent advances in photonics integration.