In a remarkable breakthrough poised to redefine the future of wireless communications, researchers at Tokushima University have developed a microcomb-driven terahertz wireless transmission system capable of unprecedented data rates surpassing 100 gigabits per second in the 560 GHz band. This pioneering achievement not only shatters the conventional 350 GHz barrier but also establishes a new benchmark for high-speed wireless signaling in the terahertz spectrum, heralding a transformative era for next-generation 6G networks.
Terahertz frequencies, spanning roughly 0.1 to 10 THz, have long been hailed as the ideal frontier for ultra-high-capacity wireless systems because of their wide available spectral bandwidth. However, generating stable and low-noise signals above 350 GHz has remained a daunting challenge for traditional electronic technologies. These systems struggle with constrained output power and elevated phase noise, which severely limit signal fidelity and data throughput. As a result, terahertz wireless research has historically operated below this threshold, capping achievable speeds in the tens of gigabits per second range.
This groundbreaking research overcomes these longstanding obstacles by harnessing optical frequency combs—remarkably precise light sources that produce a spectrum of discrete, equally spaced frequency lines—created through microresonators, often called microcombs. The team engineered a fiber-coupled soliton microcomb device, directly integrating an optical fiber with a silicon nitride microresonator chip. This architecture elegantly eliminates the necessity for complex optical alignment and paves the way for a compact, robust platform that maintains exceptional frequency stability even under environmental fluctuations.
The soliton state in the microresonator facilitates ultra-low phase noise operation, a critical factor when translating optical signals to the terahertz domain via photomixing. Using high-power optical pumping enabled by the fiber attachment, the device generates stable, high-purity optical carriers in the vicinity of 560 GHz—substantially above earlier limitations. Moreover, the integration of precise temperature control mechanisms enhances resonance reproducibility and protects against thermal drifts, ensuring the system’s reliability for practical applications.
Employing this microcomb output, the researchers used optical injection locking to produce two highly stable optical carriers, which were subsequently modulated using advanced high-order formats—quadrature phase-shift keying (QPSK) and 16-quadrature amplitude modulation (16QAM). These modulated signals were photomixed to generate terahertz waves at 560 GHz, harnessing the superior purity and stability of the microcomb sources to push data transmission well beyond previous benchmarks.
At the receiving end, a sophisticated heterodyne detection scheme utilizing a sub-harmonic mixer recovered the transmitted information with high fidelity. Impressively, the system achieved sustained data rates of 84 Gbps employing QPSK modulation and a record-breaking 112 Gbps using the more spectrally efficient 16QAM format. This leap represents the first demonstration of 100 Gbps-class terahertz wireless communication at frequencies above 420 GHz, effectively opening a new frontier for ultra-high-speed wireless protocols.
The implications of this research resonate profoundly with the ambitions for 6G and beyond, where ultra-broadband and low-latency connections will underpin a myriad of applications including immersive extended reality, massive IoT, and real-time high-definition media streaming. Not only does the microcomb-driven approach promise significant miniaturization and integration benefits, but its inherent stability and scalability also suggest it could serve as the technological backbone for next-generation mobile backhaul infrastructure and photonic-wireless hybrid networks.
Professor Takeshi Yasui of Tokushima University emphasized that this development signifies a major leap toward realizing practical 6G wireless systems. He highlighted that by leveraging photonics to surmount electronic limitations, the team has showcased a pathway to achieve unprecedented communication speeds at terahertz frequencies, which were previously considered unattainable for stable wireless transmission.
Looking forward, researchers intend to refine the system’s phase noise characteristics further to support even higher-order modulation schemes, which could exponentially increase spectral efficiency. Additionally, they aim to extend communication distances by boosting terahertz output power through optimized photomixing and innovative antenna designs. Such advancements could propel ultra-high-speed connectivity into everyday use cases, transforming mobile networks and data centers alike.
This work underscores the transformative potential of integrated photonics married with wireless technologies, charting a course that melds compact, scalable hardware with the immense bandwidth of terahertz waves. As silicon nitride microresonator fabrication matures, the prospects for widespread deployment of microcomb-enabled wireless systems become increasingly tangible, promising a quantum leap in data capacity and network performance.
In sum, this pioneering experiment at Tokushima University reshapes our understanding of how high-frequency photonics can unlock the next generation of wireless communication. By surmounting the 350 GHz barrier and delivering a single-channel 112 Gbps photonic wireless link at 560 GHz, the research not only sets a new world record but also constructs a foundational platform upon which the future of global connectivity can be built.
Subject of Research: Not applicable
Article Title: Beyond 350 GHz: Single-channel 112 Gbps photonic wireless transmission at 560 GHz using soliton microcombs
News Publication Date: 18-May-2026
Web References: 10.1038/s44172-026-00659-8
Image Credits: Tokushima University
Keywords
Photonics, Telecommunications, Terahertz Wireless Communication, Optical Frequency Combs, Microresonators, 6G Networks, Soliton Microcombs, High-Speed Wireless, Photomixing, Phase Noise, Optical Injection Locking, QPSK, 16QAM
