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A Perspective on Photonic Multi-Protocol Label Switching

We first review the history of MPLS (Multi-Protocol Label Switching) in order to later introduce photonic MPLS. As an emerging technology for carrying IP traffic over photonic networks, we next discuss IP over WDM networks based on the MPLS technology (λ-MPLS). Then, an optical code label switching technique and its application to MPLS (OC-MPLS) is introduced. We extensively compare advantages and disadvantages of those two approaches, which is our main objective in this paper. By discussing remaining and challenging problems of two approaches, the possibility of a future deployment of OC-MPLS is finally addressed.