Chapter 4: Optical Detectors

Example 4.1,Page number 99

In [2]:
import math

#given

Tn=5;              #in micrometer
Vs=10**7;          #in m/s
tr=Tn*10**-6/Vs;
print"Response time",tr/10**-12,"ps";

Response time 0.5 ps

Example 4.2,Page number 106

In [1]:
import math

#given


Pd=1.15;            #in mW

TA=25;              #in deg C
theta_JA=200;          #in C/W for hermetric led
TJ=TA+theta_JA*Pd/10**3;
TF=8.01*10**12 *math.e**-(8111/(TJ+273));
print"Value of TJ is" ,round(TJ,4), "deg C";
print"Value of TF is" ,round(TF,4), "deg C";

BF=1.1*10**-3;               #from table
QF=0.5;                     #from table
EF=1;                       #from table
RF=BF*TF*EF*QF*1/10**6;
print"Value of RF","{0:.3e}".format(RF);
print"Value of MTBF is ","{0:.3e}".format(1/RF),"hours";

Value of TJ is 25.23 deg C
Value of TF is 12.3614 deg C
Value of RF 6.799e-09
Value of MTBF is  1.471e+08 hours

Example 4.3,Page number 114

In [13]:
import math

#given

R1=0.7;
R2=0.99;
ad=0.1;

Ld=1-R1*R2*math.e**-(2*ad);
print"Decay Loss ",round(Ld,4);
trt=40;     #fs
tph=trt/Ld;
print"Photon lifetime ",round(tph,4),"fs";
BW=1/tph;
print"Bandwidth",round(BW*1000,4) ,"Thz";  #Answer in Thz  

Decay Loss  0.4326
Photon lifetime  92.46 fs
Bandwidth 10.8155 Thz