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SOA placement options in CDMA star

The SOAs can be placed at three positions as shown in Fig.

and

. Using the models of ASE beat noises, thermal noise and shot noise of receiver and the methodology as given in [7], the computations have been done for the sample network and results are analysed.

**Figure:** Postamplifier scheme
11 $\includegraphics[width=3in]{fig4_1.ps}$

**Figure:** Preamplifier after decoder (preamplifier-1)
11 $\includegraphics[width=3in]{fig4_2.ps}$

**Figure:** Preamplifier before decoder (preamplifier-2)
11 $\includegraphics[width=3in]{fig4_3.ps}$

Dr.Yatindra Nath Singh
2002-05-23