924340.fig.0011a
(a)
924340.fig.0011b
(b)
Figure 11: (a) Average BER (logarithmic scale) achieved in eight channels of the long-haul WDM transmission system employing the largest number of cascaded FOPAs versus length of fiber span. Note that for fiber span from 30 to 45 km, the logarithmic scale of BER is -inf. (b) Average SNR achieved in eight channels of the system versus length of fiber span. System and FOPA description are the same with Figure 10 caption.