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+//fiber optic communications by joseph c. palais

+//example 11.5

+//OS=Windows XP sp3

+//Scilab version 5.4.1

+clc

+ clear all

+//given

+RL=100//load in ohm

+T=300//temperature in kelvin

+lambda=0.82*10^-6//wavelength in um

+e=1.6e-19//charge of electron in colums

+k=1.38e-23//boltzman constant

+h=6.63e-34//plancks constant

+deltaf=1e6//link bandwidth in Hz

+Error_rate=10^-4//desired error rate

+eta=1//quantum efficiency

+c=3*10^8//speed of light in m/s

+snr=17.5//Signal to noise ratio from plot correspnding to error rate of 10^-4 in dB

+SNR=10^(snr/10)//signal to noise ratio in normal scale

+tau=10^-6//bit interval in Sec

+//to find

+f=c/lambda//optic frequency in Hz

+P=(h*f/(eta*e) )*sqrt((4*k*T*deltaf)/RL)*sqrt(SNR)//Optic power incident in Watts

+mprintf("Optic power incident=%fnW",P*10^9)//multiplication by 10^9 is to convert the unit from W to nW

+i=eta*e*P/(h*f)//current in Amperes

+mprintf("\nCurrent=%fnA",i*10^9)//multiplication by 10^9 is to convert the unit from A to nA

+np=P/(h*f)*tau// No. of photons per bit

+mprintf("\nNo. of Photons per bit=%fx10^5 photons/bit",np/10^5)//multiplication by 10^5 is to convert the unit x10^5

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