Continuous QPSK-OFDM for integrated optical communication and distributed acoustic sensing.

Authors

Xi Chen, Maoqi Liu, Yichang Wu, Zixian Wei, Changyuan Yu, Zhaohui Li

Published in

Optics letters. Volume 51. Issue 21. Pages 5954-5957. Nov 01, 2026. Epub Sep 30, 2026.

Abstract

Optical fibers can carry data while also supporting sensing based on Rayleigh backscatter. A single continuous quadrature phase-shift keying orthogonal frequency-division multiplexing (QPSK-OFDM) waveform supports communication and distributed acoustic sensing without sensing bursts, zero padding, or separate wavelength or time resources, but the cyclic prefix (CP) duration must exceed the fiber round-trip delay. For backscatter sensing, polarization combining and subband combining suppress polarization fading and Rayleigh fading, respectively. Over 5.9 km, the system achieves a 2.50 m spatial resolution, a 7.915 kHz sensing sampling rate, and a 69.4 pε/√(Hz) noise floor. Forward transmission at 208.95 Mb/s yields no observed bit errors and a root mean square error vector magnitude (RMS EVM) of -27.00 dB.

PMID:
42962096
Bibliographic data and abstract were imported from PubMed on 31 Oct 2026.

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