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

Ahmad Abdo, Sadok Aouini, Bilal Riaz, Naim Ben-Hamida and Claude D’Amours
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Ahmad Abdo: School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada
Sadok Aouini: Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Bilal Riaz: Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Naim Ben-Hamida: Ciena Corporation, Ottawa, ON K2K 0L1, Canada
Claude D’Amours: School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON K1N 6N5, Canada

Future Internet, 2019, vol. 11, issue 10, 1-13

Abstract: 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.

Keywords: optical communications; networks optimization; coherent communications; phase-locked loop; gridless wavelength selective switch; software-defined networks (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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