Optical Sensors
Tutorial 1
August 07, 2014
1. The overall gain of an optical receiver is 1x10^6 V/A for an incident optical signal of 1
W using a PIN photodiode having an internal capacitance of 2 pF, responsivity of 0.9
A/W and dark current of 1 nA. Assu
Plotting of Surfaces And Visualizing Tangents
(15BEM0043)
Q.1 Draw the 3-d plot for the following
function:a)
MATLAB CODE :
clc
clear all
syms t x y z
t=0:1:100;
x=t;
y=t.^2;
z=t.^3;
plot3(x,y,z)
OUTPUT FIGURE :
5
x10
10
8
6
4
2
0
10000
5000
0
0
20
40
60
3. INTEGRATION AS AREA UNDER THE CURVE
Aim:
To write Matlab codes to evaluate the area under the curve
To visualize the area enclosed between the coordinate axes and the curve y=f(x)
A definite integral over an interval uses a limit process to assign meas
List of Experiments
Experiment
Number
1
2
3
4
5
6
7
8
9
10
Title
INTRODUCTION TO MATLAB
To know about the MATLAB working procedures such
as saving files and basic commands and symbolic
computations
PLOTTING OF CURVES
Plotting and visualizing general fun
Electromagnetics, RF and Photonics
Devices, Circuits and Systems
MS & PhD (By Research)
M.Tech. (Microelectronics & Photonics)
January 2017
Department of Electrical Engineering
Photonics Research Group
The faculty pyramid at a glance
Anil & Hari
Anil & Ba
Intensity is a (circular symmetric) Gaussian function of radial
distance for any value of x.
Approx. 86% of the total power within a circle of Gaussian
radius w
x
w0
1
2
Optical Sensors - Tutorial 4
1.
You have to design a fiber optic gyroscope (FOG). Let the total length of the fiber loop is 500 m with an
8
attenuation of 0.4 dB/km, loop diameter of 10 cm, wavelength of 1.5 m, group velocity of 2x10 m/s and
a capture ang
Tutorial 1
Optical Sensors
1. A conventional APD with gain 20 operates at a wavelength of 1550 nm. If its responsivity at this
wavelength is 12 A/W, calculate quantum efficiency (). What is the photo-current at the output
device if a photon flux of 1010 p
Optical Sensors - Tutorial 5
1.
Reflectivity of FBG:
a) From coupled mode theory differential equations, derive the expression for reflectivity of a
fiber Bragg grating.
b) The core and cladding refractive index of circular fiber is ncore= 1.46, ncladding
Optical Sensors - Tutorial 6
1.
(a) A 40 ns pulse with 100 mW peak power at 1550 nm is passed through a 60 km SMF. Calculate the
maximum and minimum back reflected power at the receiver? Assume Rayleigh backscattering coefficient
51 dB/s.
(b) Determine t
Optical Sensors - Tutorial 3
1. Cavity ring down spectroscopy (CRDS) is a technique which is used to sense different
samples (gases or liquids). In this technique, a sample is filled inside a Fabry Perot cavity.
The sample absorbs at the same wavelength a
Optical Fiber Sensors
Dr.A.R.Ganesan
Associate Professor
Department of Physics
Indian Institute of Technology Madras
Chennai 600 036, India.
[email protected]
What is a sensor?
A device that responds to a stimulus, such as
heat, light, or pressure, and gener
Tutorial 1 solutions
August 14, 2014
1.
I
a) Responsivity (R)= PP => IP = 0.9A
in
Vout = Gain I p = 0.9 V
Vout = IP RL =>RL = 1M
b)
(a) Schematic
(b) NEC
Figure 1: Direct Loading
1
(a) Schematic
(b) NEC
Figure 2: TIA
c) Bandwidth for direct loading congur
Optical Communications
Dr. A. R. Ganesan
Department of Physics
Indian Institute of Technology Madras
Chennai - 600 036
[email protected]
Communication systems
Communication systems
Acoustical
Optical
Electrical
Modulation at Optical
Frequency
No modulation
Tutorial 2
Optical Sensors
1. Gesture Recognition System Design:
Design a gesture recognition system with a spatial resolution of 1 cm over a range of 2 m x 2 m.
Assume that detector has a noise variance (2) of 4.14x10-5 W , the geometric losses are 20 dB
Q.1 Draw the 3-d plot for the following
function:a)
MATLAB CODE :
clc
clear all
syms t x y z
t=0:1:100;
x=t;
y=t.^2;
z=t.^3;
plot3(x,y,z)
OUTPUT FIGURE :
5
x10
10
8
6
4
2
0
10000
5000
0
0
20
40
60
80
100
b)
MATLAB CODE :
clc
clear all
syms t x y z
t=-100: