Neuromorphic computing implementing spiking neural networks (SNN) is a promising technology for reducing the foot-print of optical transceivers, as required by the fast-paced growth of data center traffic. In this wor...
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Neuromorphic computing implementing spiking neural networks (SNN) is a promising technology for reducing the foot-print of optical transceivers, as required by the fast-paced growth of data center traffic. In this work, an SNN nonlinear demapper is designed and evaluated on a simulated intensity-modulationdirectdetection linkwith chromatic dispersion. The SNNdemapper is implemented in software and on the analog neuromorphic hardware system BrainScaleS-2 (BSS-2). For comparison, linear equalization (LE), Volterra nonlinear equalization (VNLE), and nonlinear demapping by an artificial neural network (ANN) implemented in software are considered. At a pre-forward error correction bit error rate of 2 x 10(-3), the software SNN outperforms LE by 1.5 dB, VNLE by 0.3dB and the ANN by 0.5 dB. The hardware penalty of the SNN on BSS-2 is only 0.2 dB, i.e., also on hardware, the SNN performs better than all software implementations of the reference approaches. Hence, this work demonstrates that SNN demappers implemented on electrical analog hardware can realize powerful and accurate signal processing fulfilling the strict requirements of optical communications.
Alternate-mark-inversion (AMI) has been used in the past to improve the transmission performance of binary intensitymodulation formats. In this work, we improved the tolerance of O-band 4-level pulse amplitude modula...
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Alternate-mark-inversion (AMI) has been used in the past to improve the transmission performance of binary intensitymodulation formats. In this work, we improved the tolerance of O-band 4-level pulse amplitude modulation (PAM4) transmission to channel impairments through the adoption of an AMI scheme. Improvements in receiver sensitivity were shown in both semiconductor optical amplifier (SOA) and bismuth-doped fibre amplifier (BDFA) equipped links. We confirmed the capability of 4-level AMI to extend the reach in the O-band, which was achieved through the mitigation of nonlinear and dispersive effects. We experimentally demonstrated a 4.28-dB Q-factor improvement for transmission over 60 km of SMF-28e. To offer an insight to the mechanisms leading to the improved tolerance to transmission impairments, we presented numerical simulations that illustrate the underlying method of action of AMI4.
An optical wireless multiple-input multiple-output communication system employing intensity-modulation direct-detection is considered. The maximal diversity order of the channel is characterized by studying the outage...
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An optical wireless multiple-input multiple-output communication system employing intensity-modulation direct-detection is considered. The maximal diversity order of the channel is characterized by studying the outage probability. Then, spatial repetition coding is shown to be diversity-optimal as it achieves the channel's maximal diversity order. This diversity order is given by a simple expression which is suitable for any channel statistics of practical interest. The results are specialized to some practical channel statistics, and numerical results are provided to verify the results.
An optical wireless intensity-modulation direct-detection multiple-input multiple-output communication system is considered. The performance of M-PAM rate-1 direct current offset space-time block codes is studied in t...
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An optical wireless intensity-modulation direct-detection multiple-input multiple-output communication system is considered. The performance of M-PAM rate-1 direct current offset space-time block codes is studied in terms of average worst-case pairwise error probability (WC-PEP) in quasi-static channels. It is shown that within this code class, the average WC-PEP is minimized by repetition coding (RC) under both electrical and optical individual power constraints, irrespective of channel statistics. This agrees with previously published results related to ON-OFF keying RC. This is further extended to sum power constraints, where it is shown that spatial beamforming minimizes the average WC-PEP within this code class, which simplifies to RC if the channel matrix has independent and indentically distributed columns and a sum electrical power constraint. Under a sum optical power constraint, this also holds true at high signal-to-noise ratio (SNR), but not at low SNR. Generally, the time dimension of this code class is redundant from an average WC-PEP perspective. Numerical results are provided to support the theoretical findings and to show that the average WC-PEP leads to a good approximation of the actual error probability at high SNR.
Over +30 dBm, penalty-free, 32 Gbit/s intensity-modulation direct-detection transmission using 4-km photonic bandgap fiber (PBGF) has been successfully demonstrated. The results show that PBGF can be useful for applic...
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ISBN:
(纸本)9798350323702
Over +30 dBm, penalty-free, 32 Gbit/s intensity-modulation direct-detection transmission using 4-km photonic bandgap fiber (PBGF) has been successfully demonstrated. The results show that PBGF can be useful for application within a high split ratio access network, which connects the optical line terminal to many users and IoT devices. In addition, we show that PBGF can be applied to the wireless network consisting of very small cells, configured with a large number of optically powered remote radio heads.
We experimentally demonstrated the transmission of 320 GBd OOK and 150 GBd PAM4 signals within a 62 GHz brick-wall system bandwidth (BW) limit, utilizing Partial Response (PR) encoding, digital anti-aliasing filter, a...
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