The University of Sydney
School of Electrical & Information Engineering
ELEC5512
Assignment 1
Due: 17:00, Sunday, August 28, 2016
1. Given the relation:
! = C2
3
4
(a) Derive an expression for the phase velocity.
(2 Marks)
(b) Derive an expression for the
Tutorial 3 Solutions
1. c
2. c
3.
(a) Since the fiber has zero dispersion at 1310 nm, the link is loss limited.
(b) BER = 0.5eM where M is the average number of photons received during a 1 bit. For BER = 1012 ,
M must be 27. From the notes, the average po
Tutorial 2 Solutions
1. b
2. d
3. From Tutorial 1
T
L
n1
1
n2
=
n1
c
=
n21
n2 c
n2
1
n1
n21
n2 c
=
n2 n1
n1
n2
n2 n1
T
= 1
n1
L
nr
2c
2n2 cT
Since N A = n1 2 N A =
.
L
T
= 10 ns/km and n2 = 1.45 we get N A = 0.093.
For
L
1
1
Maximum bit rate =
=
= 2.5Mbit
Tutorial 4 Solutions
1.
Ei
REie
1
-jl
2
2
R Eie
E out
-2jl
3
l
We have waves that make 1 pass, 3 passes, 5 passes,. . . through the cavity before leaving the second
mirror. Adding up the contributions by each of these waves, we get the amplitude of the ou
Tutorial 3
1. What is present in a digital receiver that is not present in an analog receiver?
a) Nothing
b) A detector
c) Thresholding and retiming circuits
d) Amplification circuits
e) Wavelength division multiplexing
2. You find a coupler with four por
Tutorial 1 Solutions
1.
n2
c
n1
n2
L
` = The length of longest ray
L = The length of the shortest ray
Based on the geometrical considerations we can write:
L
L
n2
=
where sin c =
.
cos
sin c
n1
c
The velocity of light in the core is v =
.
n1
2
n1 L
n L
L
Tutorial 2
1. How is LED output modulated?
a) externally by varying current delivered to an external modulator
b) directly by varying drive current
c) directly by varying voltage applied to an external modulator
d) directly by varying LED operating temper
Tutorial 4
1.
Derive the power transfer function of the Fabry-Perot Filter.
Show that the resonant frequncies fn of a Fabry-Perot cavity satisfy fn = f0 + nf , where n is an
integer, for some xed f0 and f .
2.
Derive the expression for the nesse of the Fa
Tutorial 1
1. Exercise in Page 10 of the notes.
2. Exercise in Page 18 of the notes.
3. You have a single-moded fiber at 850 nm, and a light source with a bandwidth of 1
nm. The dispersion of the fiber is D = 80 ps/nm-km. What is the maximum data rate
tha
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The University of Sydney
School of Electrical and Information Engineering
ELEC5512 Optical Networks
Unit of Study Information
Aim
This unit builds upon the fundamentals of optical communications introduced
in ELEC3405 (Communications Electronics and Photo
Important Sections from the Textbook
The following chapters and sections thereof from the First Edition of
the textbook (i.e. Optical Networks: A Practical Perspective) will be covered
in this unit. They should be read in conjunction with the course notes