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Conventional wisdom in designing the optical switching nodes is rooted in theintuition that when an optical channel crossing an intermediate node, it shouldbe maximally isolated from other optical channels to avoid interference. Suchlong-established paradigm perceiving the interference of optical channelstransiting at the same node as an adversarial factor and should thereforecircumvent, albeit reasonable, may leave vast unexplored opportunities. Indeed,rapid advances in all-optical signal processing technologies has broughtopportunities to re-define the optical node architecture by upgrading its naivefunctionalities from simply add/drop and cross-connecting to proactively mixingoptical channels in photonic domain. Specifically, all-optical channel (de-)aggregation technologies have been remarkably advancing in recent years,permitting two or more optical channels at lower bit-rate and/or modulationformats could be all-optically aggregated to a single channel of higher-rateand/or higher-order modulation format and vice versa. Such evolutionarytechnique is poised to disrupt the existing ecosystem for optical networkdesign and planning, and thus necessitates for a radical change to unlock newpotentials. In addressing this disruptive idea, we present a new paradigm forfuture optical networks, namely, optical-processing-enabled networks powered byin-network all-optical mixing capability. We introduce the operationalprinciple of optical channel (de-) aggregation and show how spectrallybeneficial such innovative operations could yield by an illustrative example.Next, in order to maximize the aggregation opportunity, we present amathematical model for optimal routing based on integer linear programmingmodel. Numerical results on the realistic network topology COST239 are providedto quantify the spectral gain of aggregation-aware routing compared to theconventional one.

Optical Networking in Future-land: From Optical-bypass-enabled to Optical-processing-enabled Paradigm