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Adaptive Coherent Receiver Settings for Optimum Channel Spacing in Gridless Optical Networks

1
School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
2
Ciena Corporation, Ottawa, ON K2K 0L1, Canada
*
Author to whom correspondence should be addressed.
Future Internet 2019, 11(10), 206; https://doi.org/10.3390/fi11100206
Received: 5 August 2019 / Revised: 19 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
In this paper, we propose a novel circuit and system to optimize the spacing between optical channels in gridless (also called flexible-grid or elastic) networking. The method will exploit the beginning-of-life link margin by enabling the channel to operate in super-Nyquist dense wavelength division multiplexing mode. We present the work in the context of software-defined networking and high-speed optical flexible-rate transponders. The clock recovery scheme allows the mitigation of jitter by decoupling the contribution of high-jitter noise sources from the clock recovery loop. The method and associated algorithm are experimentally verified where a spectrum gain of up to 2 GHz in spacing between two channels in the Media Channel (MC) is obtained compared to conventional clocking strategies. We showed that the improvement is equivalent to increasing throughput, in a data-center interconnect scenario, by up to 300 giga-bits per second per route. View Full-Text
Keywords: optical communications; networks optimization; coherent communications; phase-locked loop; gridless wavelength selective switch; software-defined networks optical communications; networks optimization; coherent communications; phase-locked loop; gridless wavelength selective switch; software-defined networks
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Abdo, A.; Aouini, S.; Riaz, B.; Ben-Hamida, N.; D’Amours, C. Adaptive Coherent Receiver Settings for Optimum Channel Spacing in Gridless Optical Networks. Future Internet 2019, 11, 206.

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