41-Tbps C-Band WDM Transmission With 10-bps/Hz Spectral Efficiency Using 1-Tbps/λ Signals

High throughput signals with high spectral efficiency (SE) are attracting interest for their application to data center interconnection application. For such application, a high baud rate and high-order modulation are desirable. This article describes each of the three steps in designing a high SE s...

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Bibliographic Details
Published in:Journal of lightwave technology 2020-06, Vol.38 (11), p.2905-2911
Main Authors: Matsushita, Asuka, Nakamura, Masanori, Yamamoto, Shuto, Hamaoka, Fukutaro, Kisaka, Yoshiaki
Format: Article
Language:English
Subjects:
Bandwidth
C band
Data centers
Dependence
Digital coherent
digital signal processing
Equalization
Finite impulse response filters
high baud rate signal generation
high capacity transmission
Modulation
optical fiber communication
Optical fibers
optical transmission
Optimization
Peak to average power ratio
Pulse duration modulation
Quadrature amplitude modulation
Signal to noise ratio
Transmitters
WDM-transmission
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Summary:High throughput signals with high spectral efficiency (SE) are attracting interest for their application to data center interconnection application. For such application, a high baud rate and high-order modulation are desirable. This article describes each of the three steps in designing a high SE signal with a net rate of 1-Tbps/λ in detail. First, the baud rate dependency of the signal-to-noise ratio (SNR) is obtained by applying methods such as precise digital calibration technique. Test signals of PDM -16 quadrature amplitude modulation (QAM), PDM-64QAM, and PDM-256QAM were compared to illustrate the modulation format dependence on signal SNR. Clipping ratio optimization and joint digital equalization and optical equalization were performed to maximize the SNR. Second, the achievable capacity is calculated from the obtained baud rate dependency of the SNR. Symbol rate is selected to maximize the achievable capacity. WDM-grid and the Nyquist pulse shaping roll-off factor is selected to achieve a high SE. Third, the rate parameter of probabilistically shaped (PS) signal are determined to generate 1-Tbps/λ net rate signal. A high fiber capacity of 41-Tbps is successfully demonstrated with C-band WDM transmission over 100 km with 41-WDM 96-Gbaud PDM-PS-256QAM signals in a 100-GHz grid.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.2986083