Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 33, Issue 20, Pages 1159-1162Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2021.3110258
Keywords
Optical attenuators; Optical fibers; Optical receivers; Optical device fabrication; Optical amplifiers; Optical modulation; Optical filters; Microwave photonics; radio-over-fiber; mobile fronthaul; optical communications
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The study introduces and demonstrates a seamless fiber-wireless system in the W-band, successfully transmitting high-order quadrature amplitude modulation orthogonal frequency-division multiplexing signals. The receiver utilizes a self-homodyne detector, showing better performance.
We propose and demonstrate a seamless fiber-wireless system in the W-band using a simple transmitter, antenna site, and radio receiver. The transmitter utilizes an optical phase modulator instead of an optical in-phase/quadrature modulator for data modulation. A high-output optical-to-radio converter is fabricated and used for radio signal generation at the antenna site. The receiver employs a self-homodyne detector (SHD) that does not require a separate local oscillator source to receive and down-convert the signal to the microwave band. For a proof-of-concept demonstration, we successfully transmitted a high-order quadrature amplitude modulation orthogonal frequency-division multiplexing signal with a bandwidth of up to 4 GHz over the system. The performance of the signal transmission over the system using an envelope detector was also evaluated. Owing to its better received sensitivity, the SHD receiver exhibited better performance. The proposed system can facilitate the deployment of seamless access networks in high-frequency bands in future mobile networks.
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