Kavli Affiliate: Feng Yuan
| First 5 Authors: Yuansheng Tao, Yuansheng Tao, , ,
| Summary:
The sixth generation (6G) wireless networks require dynamic spectrum
management to optimize the utilization of scarce spectral resources and support
emerging integrated sensing and communication (ISAC) applications. This
necessitates real-time spectrum sensing (RT-SS) capability with ultrawide
measurement range, compact size, and low latency. Conventional electronic RT-SS
solutions face critical challenges in operating across the millimeter-wave and
sub-terahertz bands, which are essential spectra for 6G wireless. While
photonic RT-SS has the potential to surpass this limitation, the current
implementations feature limited bandwidths below 50 GHz and mostly rely on
bulky dispersive fibers with high latency. Here, we address these challenges by
developing an integrated photonic RT-SS system capable of ultrabroadband
measurement from microwave to sub-terahertz bands, covering the full spectrum
for 6G wireless. The photonic RT-SS circuit integrates a broadband
electro-optic (EO) modulator for unknown signal loading, an EO tunable
microring filter bank for high-speed parallel frequency-to-time mapping, as
well as an EO comb for precise channel frequency referencing, all realized on a
single thin-film lithium niobate chip. We achieve an unprecedented spectral
measurement range beyond 120 GHz at a low latency of less than 100 ns. To
validate the effectiveness of our photonic RT-SS system in future 6G scenes, we
further propose a heuristic spectro-temporal resource allocation algorithm and
conduct a proof-of-concept ISAC demonstration, where a radar adaptively access
RT-SS-informed spectrally underutilized regions for high-quality target sensing
under dynamic communication interferences. Our work presents a compact and
cost-effective solution for efficient spectrum sharing and dynamic management
in future 6G ISAC networks.
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