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diff --git a/3822/CH6/EX6.1/Ex6_1.jpg b/3822/CH6/EX6.1/Ex6_1.jpg
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diff --git a/3822/CH6/EX6.1/Ex6_1.sce b/3822/CH6/EX6.1/Ex6_1.sce
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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.1

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+eta=0.70;//quantum efficiency 

+E=2.2*10^-19;//energy of the photons in Joule

+Ip=2*10^-6;//photocurrent in A //the value in question is different from that used in solution in question it is mA and in solution it is uA

+h=6.62*10^-34;//Planck's constant in SI units

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

+e=1.9*10^-19;//electric charge in coulomb

+lamda=(h*c)/E;//operating wavelength of the photodiode in m

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

+R=(eta*e)/(h*f);//Responsivity in A/W

+Po=Ip/R;//incident power in W

+mprintf("\n Operating wavelength of the photodiode is= %.2f um",lamda*1e6);//multiplication by 1e6 for conversion of unit from m to um

+mprintf("\n Incident power is =%.2f uW",Po*1e6);//multiplication by 1e6 for conversion of unit from W to uW

diff --git a/3822/CH6/EX6.10/Ex6_10.jpg b/3822/CH6/EX6.10/Ex6_10.jpg
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diff --git a/3822/CH6/EX6.10/Ex6_10.sce b/3822/CH6/EX6.10/Ex6_10.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.10

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+E=1.15*(1.6e-19);//band gap energy in V

+h=6.62e-34;//plank's constant in S.I units

+c=3e8;//velocity of light in m/s

+

+

+lamda_c=(h*c)/(E);//critical wavelength in meter

+mprintf("The critical wavelength is=%.2f um",lamda_c*1e6);//multiplication by 1e6 to convert unit from m to um

+//the answer vary due to roundingoff 

diff --git a/3822/CH6/EX6.11/Ex6_11.jpg b/3822/CH6/EX6.11/Ex6_11.jpg
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diff --git a/3822/CH6/EX6.11/Ex6_11.sce b/3822/CH6/EX6.11/Ex6_11.sce
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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.11

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+Pin=900*10^-3;// Input Power in W

+Voc=600*10^-3;// Open circuit voltage in V

+Isc=240*10^-3;//Short circuit current in A

+FF=0.75;//Fill factor

+Pmax=(Voc*Isc*FF);// Maximum Power in W

+eta=(Pmax/Pin);// Conversion Efficiency 

+mprintf("\n Conversion Efficiency is =%.2f Percent",eta*100);//multiplication by 100 to convert into percentage

diff --git a/3822/CH6/EX6.12/Ex6_12.jpg b/3822/CH6/EX6.12/Ex6_12.jpg
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diff --git a/3822/CH6/EX6.12/Ex6_12.sce b/3822/CH6/EX6.12/Ex6_12.sce
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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.12

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+Area_Cell=4;// Area of each cell in cm^2

+eta=0.12;// Conversion Efficiency

+V=0.5;// Voltage generated in V

+Pt=12;// Total output Power in W

+IR=100*10^-3;// Solar Constant or Input Radiation in mW/cm^2

+Active_area_Panel=(Pt/(IR*eta));// Active area of the Panel in cm^2

+Number_Cells=(Active_area_Panel/Area_Cell);// Number of cells

+I=(eta*IR*Area_Cell/V);// Current capacity in A

+mprintf("\n Number of Cells are =%.2f",Number_Cells);

+mprintf("\n Active area of the Panel is= %.2fcm^2",Active_area_Panel);

+mprintf("\n Current capacity of each cell is =%.2fmA",I*1e3);//Multiplication by 1e3 to convert unit to mA from A

diff --git a/3822/CH6/EX6.2/Ex6_2.jpg b/3822/CH6/EX6.2/Ex6_2.jpg
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diff --git a/3822/CH6/EX6.2/Ex6_2.sce b/3822/CH6/EX6.2/Ex6_2.sce
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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.2

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+rp=3*10^11;//number of incident photon

+re=1.5*10^11;//number of hole-pairs generated

+lamda=0.85*10^-6;//wavength in m

+h=6.62*10^-34;//Plank's constant in SI Unit

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

+e=1.9*10^-19;//electric charge in Coulomb

+eta=re/rp;//quantum efficiency

+c1=(e*lamda)/(h*c);//constant value

+R=eta*c1;//responsivity of the photodiode inA/W

+mprintf("\n Quantum efficiency is= %.2f",eta);

+mprintf("\n Responsivity of the photodiode is= %.2f A/W",R);

diff --git a/3822/CH6/EX6.3/Ex6_3.jpg b/3822/CH6/EX6.3/Ex6_3.jpg
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diff --git a/3822/CH6/EX6.3/Ex6_3.sce b/3822/CH6/EX6.3/Ex6_3.sce
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+
+//Optoelectronics and Fiber Optics Communication by C.R. Sarkar and D.C. Sarkar

+//Example 6.3

+//OS = Windows 7

+//Scilab version 5.5.2

+

+clc;

+clear;

+

+//given

+eta=0.65;//quantum efficiency

+E=1.5*10^-19;//energy of the photons in V

+Ip=3*10^-6;//diode current in A

+h=6.62*10^-34;//Plank's constant in SI unit

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

+e=1.9*10^-19;//electric charge in coulomb

+lamda=(h*c)/E;//wavelengthof the operating diode in m

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

+R=(eta*e)/(h*f);//responsivity in A/W

+Po=Ip/R;//incident optical power in W

+mprintf("\n Operating wavelength is =%.2f um",lamda*1e6);//multiplication by 1e6 for conversion of unit from m to um

+mprintf("\n Incident optical power is =%.2f uW ",Po*1e6);//multiplication by 1e6 for conversion of unit from W to uW//the answer vary due to rounding

diff --git a/3822/CH6/EX6.4/Ex6_4.jpg b/3822/CH6/EX6.4/Ex6_4.jpg
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diff --git a/3822/CH6/EX6.4/Ex6_4.sce b/3822/CH6/EX6.4/Ex6_4.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.4

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+Eg1=1.43;//Band Gap Energy of photodetector in eV

+Eg2=[(1.43*1.6*10^-19)];//Band Gap Energy in joule

+

+lamdac=[(6.62*10^-34*3*10^8)/Eg2];//Cut-Off wave length in micrometer

+mprintf("\n cut-off wave length is=%.2fum",lamdac*10^6);//multiplication by 10^6 to convert unit into um//the error is due to roundingoff

+

diff --git a/3822/CH6/EX6.5/Ex6_5.jpg b/3822/CH6/EX6.5/Ex6_5.jpg
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diff --git a/3822/CH6/EX6.5/Ex6_5.sce b/3822/CH6/EX6.5/Ex6_5.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.5

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+//case (1):

+n1=3.5;//refractive index of layer 1

+alpha=1e5;//it is in m^-1

+d=3e-6//depth of planar layer in m 

+W=1e-6//width of depletion layer in m

+//case (2):

+alpha2=1e6;//it is in 1/m

+

+Rf=[(n1-1)/(n1+1)]^2;//reflection coefficient

+//case (1):

+PW1byP1=exp(-alpha*(d))*[1-exp(-alpha*W)]*(1-Rf);//fraction of incident power absorbed

+//case (2):

+PW2byP1=[exp(-alpha2*(d))]*[1-exp(-alpha2*W)]*(1-Rf);//fraction of incident power absorbed

+mprintf("Fraction of energy absorbed for case 1 is=%0.2f percentage",PW1byP1*100);

+mprintf("\nFraction of energy absorbed for case 2 is=%0.2f percentage",PW2byP1*100);

diff --git a/3822/CH6/EX6.6/Ex6_6.jpg b/3822/CH6/EX6.6/Ex6_6.jpg
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diff --git a/3822/CH6/EX6.6/Ex6_6.sce b/3822/CH6/EX6.6/Ex6_6.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.6

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+lamda=0.8e-6;//wave length of radiation in micrometer

+P=0.60e-6;//optical power in microwatts 

+ita=0.7;//quantum efficiency of a silicon RAPD is 70%

+I=10e-6;//Output of device after avalanche gain in microampere

+e=1.6e-19;//

+h=6.62e-34;//plank's constant in S.I units

+c=3e8;//velocity of light in m/s

+

+R=[(ita*e*lamda)]/[h*c];//Responsivity in A/W

+Ip=P*R;//diode current in microampere

+M=I/Ip;//multiplication factor

+mprintf("\n Responsivity is=%.2f A/W",R);

+mprintf("\n Diode current is=%.2f uA",Ip*1e6);//multiplication by 1e6 to convert the unit from ampers to uA

+mprintf("\n Multiplication factor is=%.2f",M);

diff --git a/3822/CH6/EX6.7/Ex6_7.jpg b/3822/CH6/EX6.7/Ex6_7.jpg
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diff --git a/3822/CH6/EX6.7/Ex6_7.sce b/3822/CH6/EX6.7/Ex6_7.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.7

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+A=(100)*(50);//area in u-meter^2

+Id=10e-9;//Measured dark current in nanoampere

+eta=0.6;//Quantum efficiency is 60%

+lamda=1.2e-6;//operating wave length in micrometer

+e=1.6e-19;//charge of an electron in columb

+h=6.62e-34;//plank's constant in S.I units

+c=3e8;//velocity of light in m/s

+

+NEP=[h*c*sqrt(2*e*Id)]/(eta*e*lamda);//noise equivalent power in watts

+D=sqrt(A*10^-12)/(NEP);//Specific directivity of the device

+mprintf("\n Noise equivalent power is=%.2f *10^-14 W",NEP*10^14);//multiplication by10^-14 to change the unit 10^-14 W

+mprintf("\n Specific directivity is=%2.f *10^8m Hz^(1/2)/W",D/10^8)//multiplication by10^8 to change the unit 10^8 m Hz^(1/2)/W

diff --git a/3822/CH6/EX6.8/Ex6_8.jpg b/3822/CH6/EX6.8/Ex6_8.jpg
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index 000000000..1c65bc627
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diff --git a/3822/CH6/EX6.8/Ex6_8.sce b/3822/CH6/EX6.8/Ex6_8.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.8

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+Ic=16e-3;//collector current in mA

+P=130e-6;//incident power in microwatts

+lamda=1.25e-6;//wavelength in micrometer

+h=6.62e-34;//plank's constant in S.I units

+c=3e8;//velocity of light in m/s

+

+//case 1:

+u=h*c*Ic;

+v=lamda*P*1.6e-19;

+Go=u/v;//optical gain of the photo transistor

+//case 2:

+hFE=Go/0.45;//common emitter current gain

+mprintf("\n optical gain of phototransistor Go is=%.2f",Go);

+mprintf("\n common emitter current gain hFE is=%.2f",hFE);

+//Answers are different due to roundingoff error

diff --git a/3822/CH6/EX6.9/Ex6_9.jpg b/3822/CH6/EX6.9/Ex6_9.jpg
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diff --git a/3822/CH6/EX6.9/Ex6_9.sce b/3822/CH6/EX6.9/Ex6_9.sce
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+
+//OptoElectronics and Fibre Optics Communication, by C.K Sarkar and B.C Sarkar

+//Example 6.9

+//OS=Windows 10

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

+clc;

+clear;

+

+//given

+tf=8e-12;//electron transit time in second

+G=60//photoconductive gain of the device

+

+Bm=1/(2*%pi*tf*G);//the maximum 3dB bandwidth in Hz

+mprintf("The 3dB bandwidth is=%.2f MHz",Bm/1e6);//division by 1e6 to covert unit from Hz to MHz

+//The answer in textbook is wrong