A novel elastic optical path network that utilizes bitrate-specific anchored frequency slot arrangement

Abstract

We propose a novel elastic optical path network where each specific bitrate signal uses its own dedicated fixed grid and one edge of its frequency grid is anchored at a specific frequency. Numerical evaluations using various bitrate signal patterns and network topologies show that the network proposal can almost match the performance of conventional flexible grid networks, while greatly mitigating the hardware requirements: it allows the use of the tunable filters for the fixed grid systems.

Improving Link Spectrum Utilization in Flexgrid Optical Networks

“…It is compared with Odd case (only odd BW values from 1 to 9 FS are allowed), and the 2-5-8 case (connections sizes are limited to 2, 5 and 8 FS). It has to be highlighted that, due to network fragmentation, larger connections experience always higher blocking, as finding enough contiguous FS becomes harder as connections size increases [18]. Therefore, the Odd case has a weakness from this point of view (connections with BW=9 FS are only present in this case).…”

Imprecise Markov Models for Scalable and Robust Performance Evaluation of Flexi-Grid Spectrum Allocation Policies

“…For each of the three allocation policies AP, we now consider the set of transition rate matrices Q AP that contains all the transition rate matrices that are compatible with the relevant (bounds on the) rates specified in Section V-B2. In particular, for every policy AP and any choice of µ + 1 (i, j, e) ∈ [i min µ 1 , i max µ 1 ], we obtain a different matrix Q AP ∈ Q AP The resulting set Q AP then characterises a lower transition rate operator Q AP according to (7). In this way, we obtain three sets Q RA , Q LF and Q MF , and their respective associated lower transition rate operators Q RA , Q LF and Q MF .…”

“…From a practical point of view, an important question is how to efficiently execute the minimisation in (7). To discuss this, we fix some x = (i, j, e) ∈ X red and define…”

“…, n}. Note that asQ RA ∈ Q RA , it follows from (7) and the conjugacy relation between Q RA and Q RA that, for any i ∈ {1, . .…”

“…In order to alleviate the spectrum fragmentation issue and limit the costs of equipment installation without renouncing the benefits of flexi-grid networks in terms of spectrum occupation reduction, alternative semi-flexible approaches have been proposed. One approach is to group traffic requests according to the number of slices required for transmission, and to place requests belonging to the same group along a dedicated fixed grid, with one edge of their superchannel anchored at a specific frequency [7]. Alternatively, a small set of predefined superchannel widths is defined.…”