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Update April

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This commit is contained in:
Silas Oettinghaus
2024-04-19 10:31:36 +02:00
parent 025498d120
commit ed17953407
30 changed files with 3261 additions and 1580 deletions
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28
Classes/03_receive/Photodiode.m
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@@ -8,6 +8,9 @@ classdef Photodiode
dark_current
temperature
randomkey
randomstream
end
methods
@@ -18,14 +21,16 @@ classdef Photodiode
options.fsimu
options.responsivity = 1;
options.dark_current = 0;
options.temperature = 20;
options.temperature = 20;
options.randomkey = 1;
end
obj.fsimu = options.fsimu;
obj.responsivity = options.responsivity;
obj.dark_current = options.dark_current;
obj.temperature = options.temperature;
fn = fieldnames(options);
for l = 1:numel(fn)
obj.(fn{l}) = options.(fn{l});
end
obj.randomstream = RandStream('mlfg6331_64','Seed',obj.randomkey);
end
function signalclass_out = process(obj,signalclass_in)
@@ -50,15 +55,16 @@ classdef Photodiode
% Detailed explanation goes here
k = Constant.Boltzmann;
q = Constant.ElementaryCharge;
T = obj.temperature + 273.15 ; %celsius + 273 = kelvin
R = 50; %resistance of phdiode (50ohm is typical value)
% Magnitude squared detection
yout = sum( abs(xin) .^2*obj.responsivity, 2 ) ;
% Magnitude squared detection (sum over pols)
yout = sum( abs(xin) .^2 * obj.responsivity, 2 ) ;
% Shot Noise
shot_noise = sqrt(k * obj.fsimu .* yout) .* randn(size(yout,1),1);
shot_noise = sqrt(q * obj.fsimu .* yout) .* randn(obj.randomstream,size(yout,1),1);
yout = yout + shot_noise;
@@ -68,7 +74,7 @@ classdef Photodiode
Bw = obj.fsimu; %is this correct? shouldnt it be the bandwidth of the actual component? e.g. 70GHz?
therm_noise_pow = therm_current_psd * 2 * Bw; %squared
therm_noise = sqrt(therm_noise_pow) .* randn(size(yout,1),1);
therm_noise = sqrt(therm_noise_pow) .* randn(obj.randomstream,size(yout,1),1);
yout = yout + therm_noise;