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+//Optical Fiber communication by A selvarajan
+//example 11.1
+//OS=Windows XP sp3
+//Scilab version 5.5.1
+clc;
+clear all;
+BW=7//bandwidth in MHz
+SNR=60//signal to noise ratio in dB
+Pin=0//Launched power in dBm
+Trise_source=20//risetime at source LED in ns
+delta_lambda=20//spectra width in nm
+lambda=850;//operating wavelength in nm
+c=2.998*10^5;//velocity of light in Km/sec
+R=0.3//Detector PIN FET responsivity in A/W
+Cdiode=3//diode capacitance in pf
+trise_detector=1//risetime at detector in ns
+S=-30//sensitivity in dbm
+Lsplice=0.2//splice loss in dB/connector
+NA=0.2//numerical aperture for GI/MM
+n1=1.46//refractive index of core
+A=2//attenuation in dB/Km
+Ls=3//loss due to source in dB
+Ld=1//loss due to detector in dB
+Psm=5//system margin in dB
+c=3*10^8//velocity of light in m/s
+
+//solution
+
+Available_power=Pin-S;//available power in dB
+Total_loss=Ls+Ld+Psm;
+Power_left=Available_power-Total_loss;//power left in dB
+L=(Power_left+Lsplice)/(Lsplice/2+2);
+tmod=L*10^3*(NA^2)/(2*c*n1);//modal dispersion in s
+Bit_rate=1/tmod;//bit rate in bps
+mprintf('Maximum permissible link length is =%fKm',L);
+
+mprintf('\nMaximum permissible bit rate is =%fMbps',Bit_rate/10^6);//division by 10^6 to convert the unit from bps to Mbps//the answer is different because of rounding off