Aware Optical Networks: Leaving the Lab

800G DSP ASIC Design Using Probabilistic Shaping and Digital Sub-Carrier Multiplexing

“…In modern transponders [9], [23], the number of operational modes increases enormously, and in recently announced 800G line-cards [8], [9] -employing PS and DSCM [8] -the number of modes becomes even larger. This paves the way to the realization of true elastic optical networks so that dynamic traffic and time-frequency varying characteristics of the channel can be instantaneously addressed [7]. Finally, we can further boost fiber capacity, (V), by transmitting beyond C-band with C+L-band.…”

“…will further increase the compound annual growth rate (CAGR) of Internet traffic, which is now ∼26%, with peaks of ∼46% in metro [6]. To cope with the current rapid traffic evolution, several options are available, among them: (I) a more efficient management of the resources based on elastic and cognitive optical networks [7]; (II) usage of highorder modulation formats and high symbol rate [8], [9]; (III) implementation of advanced DSP and forward error correction (FEC) algorithms [10]; (IV) transmission with advanced digital communication techniques such as probabilistic shaping (PS) and digital sub-carrier multiplexing (DSCM) [11], [12]; (V) enabling beyond C-band transmission [13]; and finally (VI) development of new fiber types such as multi-mode andcore [14], [15]. Choices (I) -(V) are currently being exploited and the selection criteria mainly depends on system requirements such as reach, cost, footprint, performance, and power consumption.…”

“…Choices (I) -(V) are currently being exploited and the selection criteria mainly depends on system requirements such as reach, cost, footprint, performance, and power consumption. An efficient management of the resources is fundamental (I), because it can postpone costly deployment of new fibers by efficiently utilizing the existing optical fiber infrastructures [7], [16]. With (II), the network architecture can be simplified by utilizing high-order modulation formats -beyond 16 quadrature amplitude modulation (QAM) -at symbol rate ≥ 90 GBaud, thus enabling single-wavelength transmission up to 800G 1 .…”

System Innovations in Inter Data Center Transport Networks

“…This paper summarizes the main WDM system innovations that have facilitated this explosive DCI evolution, and then presents (in section 4) some important recent innovations in optical transport design achieved by combining the advancements in coherent open WDM with extensible software/SDN infrastructure. More specifically, this novel networking paradigm usually couples recent advancements in streaming-telemetry methodologies [10,13] with emerging network analytics frameworks [13,18]. These are often combined with machine-learning [18], to improve capacity (e.g.…”

“…More specifically, this novel networking paradigm usually couples recent advancements in streaming-telemetry methodologies [10,13] with emerging network analytics frameworks [13,18]. These are often combined with machine-learning [18], to improve capacity (e.g. optical margin) optimization [18,19], as well as enhancing (e.g.…”