## 3 Heterogeneous MLR Network of the NG-PON Type
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \(\mathbf{Av2}\) & \(\mathbf{C_{N}}\) & \(\mathbf{C_{Total}}\) & \(\mathbf{C_{Pro}}\) & \(\mathbf{\eta_{ded}}\) & \(\mathbf{\eta_{dist}}\) \\ \hline \multirow{2}{*}{50 GHz} & \multirow{2}{*}{10 Gbps} & 2 CH of 10 Gbps & Distance 80.5 km & 37.25 GHz & 87.25 GHz \\ \cline{3-5}  & & 20 Gbps & 1.61 Tbps/km & 26.85\% & 22.92\% \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Measurement and control variables of the two channels of 10 Gbps. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \(\mathbf{Av3}\) & \(\mathbf{C_{N}}\) & \(\mathbf{C_{Total}}\) & \(\mathbf{C_{Pro}}\) & \(\mathbf{\eta_{ded}}\) & \(\mathbf{\eta_{dist}}\) \\ \hline \multirow{2}{*}{–} & \multirow{2}{*}{40 Gbps} & 1 CH of 40 Gbps & Distance 80.5 km & 138 GHz & 138 GHz \\ \cline{3-5}  & & 40 Gbps & 3.22 Tbps/km & 28.99\% & 28.99\% \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Measurement and control variables, 40 Gbps channel. Regarding the article Adaptation of information theory for the linear propagation regime of a next generation DWDM optical network, which adapts [PERSON]'s information theory and proposes an equation for the measurement of spectral efficiency, it differs with the present work of degree, in which the development of said equation was carried out for homogeneous systems, therefore, it has certain limitations, since the future of optical networks will be heterogeneous. Through the application in heterogeneous networks, it was possible to distinguish parameters that allow for the improvement of spectral efficiency, which is the case for the case of a single-layer network. \begin{table}
**Characteristics** & **Chanels 2.5 Gbps** & **Chanels 10 Gbps** & **Chanels 40 Gbps** \\ \hline Characteristic & & & & \\ eye diagram & & & & \\ \hline \hline \end{tabular} \
\begin{tabular}{c c c c c} \hline \hline  & CH1 & CH2 & CH3 & CH4 & CH1 & CH1 \\ \hline BER & \(10^{-40}\) & \(10^{-40}\) & \(10^{-40}\) & \(10^{-40}\) & \(10^{-40}\) \\ \hline \hline \end{tabular}
\begin{tabular}{c c c} Optical & & & & \\ spectrum & & & & \\ throughput & & & & \\ \hline Spectral & & & & \\ efficiency & & & & \\ \hline Tolerance to & & & & \\ optical & & & & \\ degradation & & & & \\ \hline Configuration & & & & \\ complexity & & & & \\ \hline Maximum & & & & \\ distance & & & & \\ reached & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Measurement and control variables of the four channels of 2.5 Gbps. efficiency, such as type of modulation, power and channel spacing, and increase in the number of propagated channels for high access capacities and large bandwidths, achieving a characterization in the design of the heterogeneous network scheme and advanced modulation formats, which significantly improve the performance of the network, with respect to optical degradations. In the article Migration Methodologies from DWDM Networks to New Generation Networks of 40 Gbps and 100 Gbps, various technologies, that allow efficient migration for links of 40 Gbps and 100 Gbps, were evaluated, such as advanced modulation formats, coherent reception technologies, and coding, achieving systematic and scalable solutions, as in the present work, which showed the same improvement behavior with robust modulations. It is considered that the greater the robustness of the system, optical speeds of up to 100 Gbps are reached, by making use of amplifiers, high-quality receivers, etc., which were not addressed in this degree work, but can provide a considerable improvement in efficiency. This migration from a 10 Gbps to 40 Gbps network is also addressed in the article Impact on Information Spectral Density in an NG-PON network architecture, in which the Shannon information theory equation is also modified.