## 5 Results of the WDM and OAM Channel Allocation Methods
### Algorithms for Allocation Methods Used in the WDM Operating Technology
Else The new OAM channel \(OAM_{k+1}\) and the zero delay is assigned to the ONU\({}_{i+1}\) And The calculation of the total wavelength delay \(D_{total}\)
11. End If
12. The bandwidth allocation of ONU requests \(BR_{ONUi+1}\) on the assigned OAM channel
13. The calculation of other result values
14. If (Are all ONU served?) 15. Then If (Are there optional functions?) 16. Then The selection of the optional function And Go to line 1
17. Else End If
18. Else Go to line 5
19. End If
```

**Algorithm 6** The Dynamic Customized Allocation Method in the OAM&WDM-PON network

In Table 3, output parameters of three allocation methods analyzed in the OAM&WDM-PON are summarized. It is obvious that cooperation of both operation technologies brings primarily marked and expressive possible WDM channel savings \(\sigma_{Ch\text{-}WDM}\) compared with allocation methods analyzed in the WDM-PON (see Table 1). It is noticeable that not only dynamic methods, but also the static method achieve high channel savings (96.30%, respectively, 85.19%). In the case of possible OAM channel savings \(\sigma_{Ch\text{-}OAM}\), only the dynamic customized allocation method can achieve a non-zero value (25%) again. As can be seen, possible WDM channel savings are markedly higher than possible OAM channel savings for all considered allocation methods. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Static** & **Dynamic** & **Dynamic Customized** \\ \hline A total number of utilized optical & 1 & 1 & 1 \\ fibers \(N_{UHUHOF}\) & & & \\ A number of possible WDM channels per & 27 & 27 & 27 \\ optical fiber \(N_{Ch\text{-}WDMperOF}\) & & & \\ A number of possible OAM channels per & 4 & 4 & 4 \\ wavelength \(N_{Ch\text{-}WDMperW}\) & & & \\ A total number of utilized WDM & 4 & 1 & 1 \\ channels \(N_{UHUHOF}\) & & & \\ A total number of utilized OAM & & & \\ channels \(N_{UHUHOF-OAM}\) & & & \\ A number of free WDM channels in the last & 23 & 26 & 26 \\ optical fiber \(N_{FreeN\text{-}WDM}\) & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Output parameters of allocation methods in the OAM&WDM-PON. ## 6 Discussion

For this work, it is essential to discuss obtained results in detail and simultaneously, to compare them with other studies and published works. First, an evaluation of acquired simulation results is introduced. Because a graphical presentation of all realized interpretations and evaluations of simulation results could lead to a massive extension of the contribution's volume, a comparison of channel utilization's efficiencies for proposed allocation methods is added in this section as an example. Then, a summary of obtained relevant findings is realized. In Figure 3, a comparison of analyzed allocation methods is displayed for the efficiencies of WDM and OAM channel utilizations for utilized operating technologies. It is obvious that the static method has the highest channel utilization in all cases. The dynamic method can bring some channel saving only at the WDM channel allocation. The most prospective option seems to be a combination of WDM and OAM operating technologies. It achieves the lowest channel utilization in both WDM and OAM areas and can bring the highest possible channel savings thanks to this fact. From the viewpoint of application in future OAM&WDM-PONs, resource efficiencies of the presented allocation methods are evaluated, and the following findings can be summarized:

* The static allocation methods do not save a number of utilized WDM channels nor utilized OAM channels. * The dynamic allocation methods can save a number of utilized WDM channels but do not save a number of utilized OAM channels. * The dynamic customized allocation methods save both a number of WDM and OAM channels. These methods are based on SLA values dedicated to the specific ONUs. Figure 3: The comparison of efficiencies of the WDM and OAM channel utilization for three allocation methods for different operating technologies.