Label Reuse Scheme in MPLS Networks based on Optical CDMA

In a multi-protocol label switching (MPLS) network based on optical code division multiplexing (OCDM), each core switching node is assign with one code sequence with N chips for each specific input/ output pair. However, there is a scalability problem that the more the number of core nodes exists, the more code sequences are needed. To solve this problem, here we consider a situation that can reuse label in order to save the number of utilized labels. In this paper, we compare the relationship of the number of utilized labels and supported LSPs (label switching paths) in both situations with and without reusing labels. We also discuss the issue of cost efficiency and bandwidth efficiency. Further, the discussion of BER performance is also included.