1. (1) A R.-J. Essiambre, G. Kramer, P. J. Winzer, G. J.Foschini, and B. Goebel, “Capacity limits ofoptical fiber networks,”J. Lightwave Technol.,vol. 28, no. 4, pp. 662-701, Feb. 2010.
2. (2) T. Morioka, Y. Awaji, R. Ryf, and D. Richardson,“Enhancing optical communications,”IEEECommun. Mag., pp. S31-S42, Feb. 2012.
3. (3) P. Sillard, M. Bigot-Astruc, and D. Molin, “Fewmodefibers for mode-division-multiplexedsystems,”J. Lightwave Technol., vol. 32, no. 16,pp. 2824-2829, Aug. 2014.
4. (4) K. Saitoh and S. Matsuo, “Multicore fiber technology,”J. Lightwave Technol., vol. 34, no. 1,pp. 55-66, Jan. 2016.
5. (5) S. O. Arik and J. M. Kahn, “Coupled-core multicorefibers for spatial multiplexing,”IEEEPhotonics Technol. Lett., vol. 25, no. 21, pp.2054-2057, Nov. 2013.