Enhanced Optical Communications Through Joint Time-Frequency Multiplexing Strategies

We present a power-efficient and reduced-complexity all-optical approach to generate high-bit rate superchannels, based on joint time-frequency multiplexing. Both optical orthogonal frequency division multiplexing (OFDM) and Nyquist-optical time division multiplexing (N-OTDM) signals are generated a...

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Bibliographic Details
Published in:Journal of lightwave technology 2020-01, Vol.38 (2), p.346-351
Main Authors: Cincotti, G., Wada, N., Uenohara, H., Kodama, T., Konishi, T., Murakawa, T., Nagashima, T., Shimizu, S., Hasegawa, M., Hattori, K., Okuno, M., Mino, S., Himeno, A.
Format: Article
Language:English
Subjects:
Bandwidths
Fourier transforms
Fractional Fourier transform
Nyquist OTDM
OFDM
Optical communication
Optical fiber dispersion
Optical fibers
optical Fourier transform
Optical pulses
Optical signal processing
Orthogonal Frequency Division Multiplexing
Peak to average power ratio
Signal processing
Subcarriers
Time division multiplexing
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Summary:We present a power-efficient and reduced-complexity all-optical approach to generate high-bit rate superchannels, based on joint time-frequency multiplexing. Both optical orthogonal frequency division multiplexing (OFDM) and Nyquist-optical time division multiplexing (N-OTDM) signals are generated and processed using a wavelength-selective switch (WSS). We use the fractional Fourier transform (FrFT) to introduce the largest degree of flexibility in optical networking, and we experimentally demonstrate that the transmitted signal can be received either in parallel, as OFDM subcarriers, or in series, as an N-OTDM signal. Compared to conventional optical OFDM, we achieve peak to average power ratio (PAPR) reduction; compared to N-OTDM, we introduce flexible chromatic dispersion (CD) management. We successfully demonstrate a field trial experiment of 4-channel 40 Gb/s hybrid OFDM/N-OTDM transmission over the 89.2-km Japan gigabit network-extreme (JGN X) test bed, with 1 bit/s/Hz spectral efficiency.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2942452