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//Example 12.8
//Program to estimate:
//(a)Maximum possible link length without repeaters when operating at 35 Mbit/s
//(b)Maximum possible link length without repeaters when operating at 400 Mbit/s
//(c)Reduction in maximum possible link length considering dispersion-equalization penalty
clear;
clc ;
close ;
//Given data
Pi=-3; //dBm - POWER LAUNCHED
alpha_fc=0.4; //dB/km - CABLE FIBER LOSS
alpha_j=0.1; //dB/km - SPLICE LOSS
alpha_cr=2; //dB - TOTAL CONNECTOR LOSS
Ma=7; //dB - REQUIRED SAFETY MARGIN
Dl=1.5; //dB - DISPERSION- EQUALIZATION PENALTY
//(a)Maximum possible link length without repeaters when operating at 35 Mbit/s
Po=-55; //dBm - REQUIRED POWER BY APD
//Optical budget: Pi-Po=(alpha_fc+alpha_j)L+alpha_cr+Ma
L1=(Pi-Po-alpha_cr-Ma)/(alpha_fc+alpha_j);
printf("\n\n\t (a)Maximum possible link length without repeaters when operating at 35 Mbit/s is %1.0f km.",L1);
//(b)Maximum possible link length without repeaters when operating at 400 Mbit/s
Po=-44; //dBm - REQUIRED POWER BY APD
//Optical budget: Pi-Po=(alpha_fc+alpha_j)L+alpha_cr+Ma
L2=(Pi-Po-alpha_cr-Ma)/(alpha_fc+alpha_j);
printf("\n\n\t (b)Maximum possible link length without repeaters when operating at 400 Mbit/s is %1.0f km.",L2);
//(c)Reduction in maximum possible link length considering dispersion-equalization penalty
//Optical budget considering dispersion-equalization penalty:
//Pi-Po=(alpha_fc+alpha_j)L+alpha_cr+Ma
L3=(Pi-Po-alpha_cr-Dl-Ma)/(alpha_fc+alpha_j);
printf("\n\n\t (c)Reduction in maximum possible link length considering dispersion-equalization penalty is %1.0f km.",L2-L3);
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