Ultra-dense optical data transmission over standard fibre with a single chip source

Bill Corcoran (), Mengxi Tan, Xingyuan Xu, Andreas Boes, Jiayang Wu, Thach G. Nguyen, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell and David J. Moss ()
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Bill Corcoran: Monash University
Mengxi Tan: Centre for Micro-Photonics, Swinburne University of Technology
Xingyuan Xu: Centre for Micro-Photonics, Swinburne University of Technology
Andreas Boes: School of Engineering, RMIT University
Jiayang Wu: Centre for Micro-Photonics, Swinburne University of Technology
Thach G. Nguyen: School of Engineering, RMIT University
Sai T. Chu: City University of Hong Kong
Brent E. Little: Xi’an Institute of Optics and Precision Mechanics Precision Mechanics of CAS
Roberto Morandotti: INRS-Énergie, Matériaux et Télécommunications
Arnan Mitchell: School of Engineering, RMIT University
David J. Moss: Centre for Micro-Photonics, Swinburne University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Micro-combs - optical frequency combs generated by integrated micro-cavity resonators – offer the full potential of their bulk counterparts, but in an integrated footprint. They have enabled breakthroughs in many fields including spectroscopy, microwave photonics, frequency synthesis, optical ranging, quantum sources, metrology and ultrahigh capacity data transmission. Here, by using a powerful class of micro-comb called soliton crystals, we achieve ultra-high data transmission over 75 km of standard optical fibre using a single integrated chip source. We demonstrate a line rate of 44.2 Terabits s−1 using the telecommunications C-band at 1550 nm with a spectral efficiency of 10.4 bits s−1 Hz−1. Soliton crystals exhibit robust and stable generation and operation as well as a high intrinsic efficiency that, together with an extremely low soliton micro-comb spacing of 48.9 GHz enable the use of a very high coherent data modulation format (64 QAM - quadrature amplitude modulated). This work demonstrates the capability of optical micro-combs to perform in demanding and practical optical communications networks.

Date: 2020
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DOI: 10.1038/s41467-020-16265-x

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