From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001 From: priyanka Date: Wed, 24 Jun 2015 15:03:17 +0530 Subject: initial commit / add all books --- 3415/CH11/EX11.4/Ex11_4.sce | 39 +++++++++++++++++++++++++++++++++++++++ 3415/CH11/EX11.4/Ex11_4a.jpeg | Bin 0 -> 31169 bytes 3415/CH11/EX11.4/Ex11_4b.JPG | Bin 0 -> 46084 bytes 3 files changed, 39 insertions(+) create mode 100644 3415/CH11/EX11.4/Ex11_4.sce create mode 100644 3415/CH11/EX11.4/Ex11_4a.jpeg create mode 100644 3415/CH11/EX11.4/Ex11_4b.JPG (limited to '3415/CH11/EX11.4') diff --git a/3415/CH11/EX11.4/Ex11_4.sce b/3415/CH11/EX11.4/Ex11_4.sce new file mode 100644 index 000000000..a289dca2a --- /dev/null +++ b/3415/CH11/EX11.4/Ex11_4.sce @@ -0,0 +1,39 @@ +//fiber optic communications by joseph c. palais +//example 11.4 +//OS=Windows XP sp3 +//Scilab version 5.4.1 +//given +clc +clear all +//given +lambda=0.85e-6//wave length in um +Row=0.5//respomsivity in A/W +ID=2*10^-9//Detector dark current in A +RL=100//load resistance in ohm +deltaf=1*10^6//receiver's bandwidth in Hz +T=300//temperature in Kelvin +e=1.6*10^-19//charge of electron in columbs +k=1.38e-23//boltzman constant + +//to find + +for i=1:6 + RL1(i)=10^(i*2);//range of load resistance in ohm + logRL(i)=log10(RL1(i))//log scale representation of load resistance + iNT(i)=sqrt(4*k*T*deltaf/RL1(i))//rms thermal noise current in A +iNSD(i)=sqrt(2*e*ID*deltaf)//rms shot noise current in A +NEP(i)=sqrt(iNSD(i)^2+iNT(i)^2)/(R*sqrt(deltaf))//Noise equivalent power (NEP) in W/Hz^1/2 + +logNEP(i)=log10(NEP(i)) +end +iNT1=sqrt(4*k*T*deltaf/RL)//rms thermal noise current in A +iNSD1=sqrt(2*e*ID*deltaf)//rms shot noise current in A +NEP1=sqrt(iNSD1^2+iNT1^2)/(R*sqrt(deltaf))//Noise equivalent power (NEP) in W/Hz^1/2 +Pmin=NEP1*sqrt(deltaf)//minimum detectable power +mprintf("Minimum detectable power =%fnW",Pmin*10^9)//multiplication by 10^9 to convert unit from W to nW +plot2d('ll', RL1, NEP) + +xtitle( "Noise equivalent power for a PIN diode having 2nA of Dark current and a 0.5W/A responsivity at 300K", "Load Resistance (Ohms)", "NEP (W/Hz^1/2)") ; + + + diff --git a/3415/CH11/EX11.4/Ex11_4a.jpeg b/3415/CH11/EX11.4/Ex11_4a.jpeg new file mode 100644 index 000000000..1bed715b9 Binary files /dev/null and b/3415/CH11/EX11.4/Ex11_4a.jpeg differ diff --git a/3415/CH11/EX11.4/Ex11_4b.JPG b/3415/CH11/EX11.4/Ex11_4b.JPG new file mode 100644 index 000000000..89f7f2569 Binary files /dev/null and b/3415/CH11/EX11.4/Ex11_4b.JPG differ -- cgit