Orthogonal chirp division multiplexing for coherent optical fiber communications

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Ouyang, Xing
Zhao, Jian
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In this paper, we propose an orthogonal chirp division multiplexing (OCDM) technique for coherent optical communication. OCDM is the principle of orthogonally multiplexing a group of linear chirped waveforms for high-speed data communication, achieving the maximum spectral efficiency (SE) for chirp spread spectrum, in a similar way as the orthogonal frequency division multiplexing (OFDM) does for frequency division multiplexing. In the coherent optical (CO)-OCDM, Fresnel transform formulates the synthesis of the orthogonal chirps; discrete Fresnel transform (DFnT) realizes the CO-OCDM in the digital domain. As both the Fresnel and Fourier transforms are trigonometric transforms, the CO-OCDM can be easily integrated into the existing CO-OFDM systems. Analyses and numerical results are provided to investigate the transmission of CO-OCDM signals over optical fibers. Moreover, experiments of 36-Gbit/s CO-OCDM signal are carried out to validate the feasibility and confirm the analyses. It is shown that the CO-OCDM can effectively compensate the dispersion and is more resilient to fading and noise impairment than OFDM.
Chirp spread spectrum , Coherent optical communication , Discrete Fresnel transform , Fresnel diffraction integral , Orthogonal chirp division multiplexing (OCDM) , Orthogonal frequency division multiplexing
Ouyang, X. and Zhao, J. (2016). Orthogonal chirp division multiplexing for coherent optical fiber communications. Journal of Lightwave Technology, 34, 4376-4386. doi: 10.1109/JLT.2016.2598575
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