*Waveguide Amplifier for Extended Reach of WDM/FSO DOI: http://dx.doi.org/10.5772/intechopen.104790*


#### **Table 5.**

*WDM analyzer filter GFF output results.*

#### **Figure 19.**

*Power spectrum and noise figure at EDFA output*.

power for the different wavelengths while the spectrum received at the output of the filter has a total power which is substantially equal and in particular the gain is flat over the amplification band **Figure 20**.

**Figure 20.** *Power spectrum and noise figure at filter FGG output*.

**Figure 21.** *Eye diagram of the WDM/FSO with GFF filter.*

According to the eye diagrams for both cases we can clearly see the aperture of diagram **Figure 21** compared to diagram **Figure 22**; this confirms that the use of the gain equalizing filter GFF improves the quality of the amplified WDM system.

*Waveguide Amplifier for Extended Reach of WDM/FSO DOI: http://dx.doi.org/10.5772/intechopen.104790*

**Figure 22.** *Eye diagram of the WDM/FSO without GFF filter.*
