Fig. 1: Ultrabroadband integrated photonics empowering omni-scenario wireless networks.
From: Ultrabroadband on-chip photonics for full-spectrum wireless communications
a, Predicted omni-scenario wireless networks with a large frequency span from sub-6 GHz low frequency (dark green) to sub-THz high-frequency (red) bands. Traditional electrical schemes require distinct device sets for each band, with accumulated noise from the multiplier-based sources at high frequencies. b, Conceptual diagram of the proposed integrated photonic scheme enabling adaptive full-spectrum operations. A broadband optoelectronic oscillator generates frequency-tunable signals covering the full band with a consistently low noise level. c, Schematic of the thin-film lithium niobate photonic wireless solution for ultrabroadband carrier and local oscillator generation, signal modulation and reception. Asterisk indicates components currently not integrated on the TFLN-chip. d, Optical microscope image of the fabricated TFLN chip. e, Photo of the co-packaged photonic-wireless system. BB Mod., baseband modulator; W–P Conv., wireless–photonic conversion; LO, local oscillation; Gen., generation; OEO, optoelectronic oscillation. Zero-IF align., zero-intermediate frequency alignment.
