initial commit / add all books

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diff --git a/3822/CH5/EX5.1/Ex5_1.jpg b/3822/CH5/EX5.1/Ex5_1.jpg
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diff --git a/3822/CH5/EX5.1/Ex5_1.sce b/3822/CH5/EX5.1/Ex5_1.sce
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+
+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.1

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+Tc=727;//temperature in celcius

+lamda=0.5*10^-6;//wavength of emitting radiation in M

+h=6.626*10^-34;//Plank's constant in SI units

+KB=1.38*10^-23;//boltzman constant in SI units

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

+f=c/lamda;//frequency in Hz

+T=Tc+273;//temperature in kelvin

+c1=(h*f)/(KB*T);//constant value

+B21byA21Pf=1/(exp(c1)-1);//ratio of stimulated and spontaneous emission rate

+mprintf("\n Ratio between stimulated and spontaneous emission is =%.1fx10^-13",B21byA21Pf*1e13); //multiplication by 1e13 to convert the ratio to 10^-13

diff --git a/3822/CH5/EX5.2/Ex5_2.jpg b/3822/CH5/EX5.2/Ex5_2.jpg
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diff --git a/3822/CH5/EX5.2/Ex5_2.sce b/3822/CH5/EX5.2/Ex5_2.sce
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+
+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.2

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+n=3.8;//refractive index

+L=200*10^-4;//length in cm

+W=100*10^-4;//width in cm

+Beta=20*10^-3;//gain factor in A/cm^3

+alpha=10;//loss coefficient per cm

+R1=((n-1)/(n+1))^2;//reflectivity

+c1=((alpha+((1/L)*(log(1/R1)))))//constant value

+Jth=(1/Beta)*c1;//threshold current density in A/cm^2

+mprintf("\n Threshold current density is= %.2f x10^3 A/cm^2",Jth*1e-3);//multiplication by 1e-3 to convert the ratio to 10^-3

+Ith=Jth*L*W;//threshold current in A

+mprintf("\n Threshold current is =%.2f mA",Ith*1e3);//the answer vary due to rouding

diff --git a/3822/CH5/EX5.3/Ex5_3.jpg b/3822/CH5/EX5.3/Ex5_3.jpg
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diff --git a/3822/CH5/EX5.3/Ex5_3.sce b/3822/CH5/EX5.3/Ex5_3.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.3

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+Br=7.21*10^-10;//injected electron density

+Pn=10^18;//majority carrier hole density in/cm^3

+Gamar=1/(Br*Pn);//minority carrier life time

+mprintf("\n Minority carrier life time is =%.2f ns ",Gamar*1e9);// the answer vary due to roundingoff

+//multiplication by 1e9 to convert the unit to nm

diff --git a/3822/CH5/EX5.4/Ex5_4.jpg b/3822/CH5/EX5.4/Ex5_4.jpg
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diff --git a/3822/CH5/EX5.4/Ex5_4.sce b/3822/CH5/EX5.4/Ex5_4.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.5

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+lamda=0.85*1e-6;//wavelength of GaAs in m

+n1=3.6;//refractive index

+L=200e-6//length of the cavity in m

+K=L*(2*n1)/lamda;//number of modes

+mprintf("\n Number of modes=%.0f ",K);//the answer vary due to rounding//multiplication by 1e6 to convert the unit to um

+u=2*n1*L;//partial product

+v=(lamda)^2;//partial product

+dellamda=v/u;//separation wavelength between the two mode in m

+mprintf("\nThe separation wavelength between the two mode=%.2f nm",dellamda*1e9);//multiplication by 1e9 to convert the unit to nm// the answer given in textbook is wrong the unit is nm but the textbook gives it as um

diff --git a/3822/CH5/EX5.5.A/Ex5_5_A.jpg b/3822/CH5/EX5.5.A/Ex5_5_A.jpg
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diff --git a/3822/CH5/EX5.5.A/Ex5_5_A.sce b/3822/CH5/EX5.5.A/Ex5_5_A.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.5(A)

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+etaT=0.20//total efficiency

+Eg=1.43//bandgap energy in eV

+V=2.5//applied voltage in V

+etae=etaT*Eg*100/V//external power efficiency

+mprintf("\n External power efficiency =%.2f percent ",etae);

diff --git a/3822/CH5/EX5.5/Ex5_5.jpg b/3822/CH5/EX5.5/Ex5_5.jpg
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diff --git a/3822/CH5/EX5.5/Ex5_5.sce b/3822/CH5/EX5.5/Ex5_5.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.5

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+etaT=0.18//total efficiency

+Eg=1.43//bandgap energy in eV

+V=2.5//applied voltage in V

+etae=etaT*Eg*100/V//external power efficiency

+mprintf("\n External power efficiency =%.0f percent ",etae);

diff --git a/3822/CH5/EX5.6/Ex5_6.jpg b/3822/CH5/EX5.6/Ex5_6.jpg
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index 000000000..b0eb1c285
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+++ b/3822/CH5/EX5.6/Ex5_6.jpg
diff --git a/3822/CH5/EX5.6/Ex5_6.sce b/3822/CH5/EX5.6/Ex5_6.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.6

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+T1=273+20;//first temperature for an AlGaAs injection laser diode in kelvin

+T2=273+80;//second temperature for an AlGaAs injection laser diode in kelvin

+T01=160;//first thershold temperature in kelvin

+T02=55;//second thershold temperature in kelvin;

+

+//case 1:

+Jth120C=exp(T1/T01);

+Jth180C=exp(T2/T01);

+Jth1=Jth180C/Jth120C;

+mprintf("\n The ratio of threshold current densities for AlGaAs=%.2f",Jth1);//the answer vary due to rounding

+

+//case 2:

+Jth220C=exp(T1/T02);

+Jth280C=exp(T2/T02);

+Jth2=Jth280C/Jth220C;

+mprintf("\n The ratio threshold current densities for InGaAs=%.2f",Jth2);

diff --git a/3822/CH5/EX5.7/Ex5_7.jpg b/3822/CH5/EX5.7/Ex5_7.jpg
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index 000000000..c224f45c0
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diff --git a/3822/CH5/EX5.7/Ex5_7.sce b/3822/CH5/EX5.7/Ex5_7.sce
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index 000000000..f21c2d09c
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 5.7

+//OS=Windows 10

+////Scilab version Scilab 6.0.0-beta-2(64 bit)

+clc;

+clear;

+

+//given

+lamda=0.85*1e-6;//wavelength of GaAs in m

+n1=3.6;//refractive index

+K=1700//number of modes

+L=K*lamda/(2*n1);//length of the cavity in m

+mprintf("\n Length of cavity in the laser=%.0f um",L*1e6);//the answer vary due to rounding//multiplication by 1e6 to convert the unit to um

+u=2*n1*L;//partial product

+v=(lamda)^2;//partial product

+dellamda=v/u;//separation wavelength between the two mode in m

+mprintf("\nThe separation wavelength between the two mode=%.2f nm",dellamda*1e9);//multiplication by 1e9 to convert the unit to nm// the answer given in textbook is wrong the unit is nm but the textbook gives it as um

+