Optical transport network design beyond 100 Gbaud [Invited]
Pedro, J. M.
; Costa, N.
Journal of Optical Communications and Networking Vol. 12, Nº 2, pp. A123 - A134, February, 2020.
ISSN (print): 1943-0620
Journal Impact Factor: 2,064 (in 2014)
Digital Object Identifier: 10.1364/JOCN.12.00A123
Optical line interface technology has been the key enabler to reduce the cost per bit transported, thus cost-effectively scaling optical transport networks and mitigating or even avoiding the need to roll out or leasevadditional optical ﬁbers. However, this technology is reaching fundamental limits, hampering the expectation of signiﬁcant gains in spectral efﬁciency in the foreseeable future. State-of-the-art line interfaces already exploit symbol rates that are roughly twice those available with the preceding generations to increase per-channel
capacity, and this trend is likely to continue. In the short term, harvesting the beneﬁts of introducing these interfaces mostly depends on the installed reconﬁgurable optical add/drop multiplexer infrastructure. In the longer term, the impact of further increases in the symbol rate also depends on the evolution of the dominant client data
rates and on the channel format selection strategies. Considering a reference transport network and extrapolating how client trafﬁc rates and line interface baud rates will evolve, this work presents a preliminary assessment of the potential beneﬁts and shortcomings of state-of-the-art and future generations of line interfaces.