64QAM wireless link with 300GHz InP-CMOS hybrid transceiver

Abdo, Ibrahim; Hamada, Hiroshi; Nosaka, Hideyuki; Shirane, Atsushi; Okada, Kei

doi:10.1587/elex.18.20210314

Cited by 6 publications

(1 citation statement)

References 32 publications

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“…We summarize up-to-date research efforts on the progress of high-speed THz wireless communication systems [21][22][23][24][25][26][27][28][29][30][31][32][33][34], as shown in Figure 2. The symbols used in the scatter plot correspond to various modulation schemes utilized in different research projects, while the colors distinguish the different approaches adopted by researchers.…”

Section: Thz Waves: Meeting High-speed Communication Needsmentioning

confidence: 99%

Phase Stabilization of a Terahertz Wave Using Mach–Zehnder Interference Detection

Ibrahim

et al. 2023

Electronics

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As a high-frequency carrier, the terahertz (THz) wave is essential for achieving high-data-rate wireless transmission due to its ultra-wide bandwidth. Phase stabilization becomes crucial to enable phase-shift-based multilevel modulation for high-speed data transmission. We developed a Mach–Zehnder interferometric phase stabilization technique for photomixing, which has proved a promising method for phase-stable continuous THz-wave generation. However, this method faced inefficiencies in generating phase-modulated THz waves due to the impact of the phase modulator on the phase stabilization system. By photomixing, which is one of the promising methods for generating THz waves, the phase of the generated THz waves can be controlled in the optical domain so that the stability of the generated THz wave can be controlled by photonics technologies. Thus, we devised a new phase stabilization approach using backward-directional lightwave, which is overlapped with the THz wave generation system. This study presented a conceptual and experimental framework for stabilizing the phase differences of optical carrier signals. We compared the optical domain and transmission performances between forward-directional and backward-directional phase stabilization methods. Remarkably, our results demonstrated error-free transmission at a modulation frequency of 3 Gbit/s and higher.

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Section: Thz Waves: Meeting High-speed Communication Needsmentioning

confidence: 99%

Phase Stabilization of a Terahertz Wave Using Mach–Zehnder Interference Detection

Ibrahim

et al. 2023

Electronics

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Demonstration of 120 Gbit/s 64-QAM Wireless Link Operating in the 300 GHz Band

Fatadin,

Smith,

Gui

et al. 2024

IEEE Access

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This paper demonstrates a 120 Gbit/s 64-Quadrature Amplitude Modulation (64-QAM) transmission link using all-electronics sub-harmonic mixers for the transmitter and the receiver operating in the 300 GHz band. The wireless signal is propagated through a non-line-of-sight free space link where reflections from 2 mirrors provide a channel length of 3 m over-the-air transmission between the transmitter and the receiver modules. Here, we demonstrate that an accurate correction of different error sources such as channel impairments of the 300 GHz wireless link as well as the combined effects of hardware amplitude and phase impairments can successfully be achieved for the high spectral-efficiency 64-QAM modulation scheme. The measured bit error ratio of the calibrated testbed is under the soft-decision forward error correction (SD-FEC) threshold of 2.7 × 10 -2 up to 120 Gbit/s with 20% overhead giving a net data rate of 100 Gbit/s post-FEC. To the best of our knowledge, this is the highest 64-QAM performance achieved using an electronics-based transmitter in the 300 GHz band.INDEX TERMS THz communications, 64-QAM, OTA transmission, Digital Signal Processing, Non-lineof-sight free space link.

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