In space-division multiplexing elastic optical networks (SDM-EONs) based on multicore fibers, the problem of finding a lightpath for a new connection request involves routing, modulation, spectrum, and core assignment (RMSCA). A lightpath can be constructed using contiguous free frequency slot (FS) blocks with different frequency slot allocation patterns (FSAPs), where each FSAP can incur different amounts of wasted FSs. Aiming at using the FSAP with the least amount of wasted FSs and exploiting path diversity, a set of new algorithms are proposed to solve the RMSCA problem. Before any connection requests arrive, all candidate paths between each pair of nodes and all FSAPs for each possible bandwidth requirement are identified and sorted. When a connection request arrives, two approaches can be used to establish a lightpath: the path-first or spectrum-first approach. We show that by packing lightpaths toward FSs with the smallest FS indexes, the spectrum-first approach leaves bigger contiguous FS blocks for future requests. As a result, the request blocking probability is minimized.

中文翻译：

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空分复用弹性光网络中的动态服务提供

在基于多芯光纤的空分复用弹性光网络（SDM-EON）中，为新的连接请求找到光路的问题涉及路由，调制，频谱和纤芯分配（RMSCA）。可以使用具有不同频率时隙分配模式（FSAP）的连续自由频率时隙（FS）块来构建光路，其中每个FSAP可能导致不同数量的浪费FS。针对使用浪费最少的FS的FSAP并利用路径分集的问题，提出了一套新算法来解决RMSCA问题。在任何连接请求到达之前，针对每种可能的带宽要求，识别并分类每对节点与所有FSAP之间的所有候选路径。当连接请求到达时，可以使用两种方法来建立光路径：路径优先或频谱优先的方法。我们表明，通过以最小的FS索引打包指向FS的光路，频谱优先方法为将来的请求留下了较大的连续FS块。结果，请求阻塞概率被最小化。