Photonics-based techniques spearhead the generation of high-frequency signals in the millimeter-andTerahertz wave, crucial for ultrabroadband mobile wireless link development. Photonic integration is enabling to provide the photonic approach with added advantages of energy-efficiency, flexibility and scalability, in addition to signal quality. We present an optical heterodyne system based on a novel dual laser module containing two InP-Si 3 N 4 hybrid lasers with intracavity wavelength selective optical filters with output optical power per laser of up to 15 dBm (31 mW), wide wavelength tuning of about 60 nm, and narrow optical linewidth below 100 kHz. To the best of our knowledge, we present for the first time the continuous-wave generation of RF frequencies over a wide tuning range from C-band (4 GHz -8-GHz) to W-band (75 GHz -110 GHz) achieving record low RF electrical linewidth around 108 kHz and long-term drift < 12 MHz with two free-running lasers. This is the best beat-note linewidth obtained with such an integrated source in a free-runnning regime and with a wide tuning range ever reported.Index Terms-photonic integration, millimeter-waves, hybrid laser, laser tuning. I. INTRODUCTIONT is expected that networks will utilize frequency bands in the millimeter-wave range (30 to 300 GHz) to deliver extreme link capacities and miniaturize transceivers [1]. These are key parameters to unlock the radio access densification in urban scenarios through wireless backhaul of small cells,

A photonic integrated circuit for microwave generation is proposed and experimentally validated. On the microchip, two tunable monochromatic lasers spectrally separated by 0 -10.7 nm are monolithically integrated with one high-speed photodiode in heterodyne configuration for enabling continuous RF synthesis from 2 to 42 GHz. Under free-running operation, the two lasers with 20 -40 MHz optical linewidth produce RF beat note with ∼90 MHz electrical linewidth at the onchip photodiode. This is the first demonstration of such a fully integrated microwave photonic generator developed within an open-access generic foundry platform.

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