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Widely Tunable RF Signal Generation Using an InP/Si 3 N 4 Hybrid Integrated Dual-Wavelength Optical Heterodyne Source

2021; Institute of Electrical and Electronics Engineers; Volume: 39; Issue: 24 Linguagem: Inglês

10.1109/jlt.2021.3078508

1558-2213

Robinson Guzmán, Luis Gonzalez‐Guerrero, Alberto Zarzuelo, Jessica César Cuello, Muhsin Ali, Ilka Visscher, Robert Grootjans, Jörn P. Epping, Chris Roeloffzen, Guillermo Carpintero,

Advanced Photonic Communication Systems

Photonics-based techniques spearhead the generation of high-frequency signals in the millimeter-and Terahertz 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.