Tutorial.pdf
Tutorial.pdf
Tutorial.pdf
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Figure 93 - Forward output spectrum of the amplified signals and the backscattered pump<br />
It is seen that the gain of the device is relatively flat in a broad spectral region. The next lesson<br />
will show how to improve that feature further by using the optimization tools of OptiSys_Design.<br />
Using the interactive 3D graphics<br />
The Raman amplifier component provides rich visual information in the form of 3D surfaces that<br />
are interactive in real time. These 3D plots show the evolution along the fiber length of the<br />
following important characteristics of the device:<br />
• Signal power spectrum<br />
• Gain spectrum<br />
• Gain coefficient spectrum<br />
• Noise figure spectrum<br />
• Double Rayleigh scattering spectrum<br />
Two 3D graphs of each type are supported – for the forward and backward propagating signals<br />
respectively.<br />
The following picture shows the evolution of the gain experienced by the forward propagating<br />
waves. The high gain of the ASE in the shorter wavelength region (right) is due to the fact that it<br />
experiences both Rayleigh and stimulated Raman scattering in the field of the strong pumps.<br />
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