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Transcript
ECE 477 Simulation Project
For any inquires, contact me @
[email protected]
1
Regulations




Don’t forget to send me your group list
Due time is Friday, March 31st, 2006.
Each Group is required to hand in a hard
copy report.
I will be in my office starting 1 pm on the due
date, you must hand in your report in person.
You have till 4:30 pm. Reports handed after
that will be marked late.
2
Software Installation


Use the attached CD to the textbook to
install a copy of “Photonic Transmission
Design Suite”
This is a fairly old copy. It might cause
some problems for PCs with windows
XP. Other problems might occur
depending on your installed JAVA
platform.
3
Software Installation (Contd.)

If you run into such problem with your
installation try the following procedure:
4
Software Installation (Contd.)

1)
a) Install PTDS software without changing
your Java.
b) Open the PTDS folder.
c) Open the jre folder.
d) Open the bin folder.
e) Look for a file symcijt.dll
f) Change it to _symcjit.dll
g) Run your software. It is largely possible
5
to work now
Software Installation (Contd.)

2)
a) Uninstall your Java platform.
b) Install Java 1.4x or preferably 1.3x
c) Install PTDS
d) Try to run it now. Sometimes this
works
6
Software Installation (Contd.)

3)
a) Repeat a to c above in method 2
b) From the installed java folder you had,
look for a folder called jre.
c) copy the jre folder to the PTDS folder.
d) Run your software. It might run this way.
7
Software Installation (Contd.)

4)
a) Install Java 1.4 or 1.3 with Java 5.
b) Make Java 1.4 or 1.3 your default.
c) follow steps b to d in method 3. It might
work here.
8
Software Installation (Contd.)

5)
a) Uninstall SP2!!!
9
Caution

However, you should know that JAVA
controls the other programs too,
especially MATLAB and IE Explorer.
These programs may be
SERIOUSLY affected when getting to
the old JAVA
10
Basics of the Photonics Simulator you will use
11
Sample Analysis
12
13
PRBS Generator
Purpose
The module generates a pseudo random or other types of binary
sequences.
Outputs
output = binary sequence (signal type: Int)
Description
A pseudo random binary sequence (PRBS) is usually required when
modeling the information source in simulations of digital communication
systems. The binary sequence can be generated with the use of a
random number generator, or, alternatively, can be directly specified by
the user or read from a specified file. The PRBS module produces a
sequence of N bits (TimeWindow/BitRate) with the numbers m and n of
zero bits (spaces) preceding and succeeding the generated bit sequence
of length N-m-n. The numbers m and n can be set by the user via
parameters PreSpaces and PostSpaces, respectively. The sequence of
generated bits may be saved to or read from a file.
14
15
NRZ Coder
Purpose
The module generates a sampled, NRZ (Non Return to Zero) coded signal defined by a
train of bits at its input. The input bit sequence is typically produced by the PRBS
Generator module. Although this module appears trivial, it is required to convert
between a digital signal and an electrical signal, so that electrical filtering may be
implemented.
Inputs
input = bit sequence to encode (signal type: Int)
Outputs
output = electrical NRZ coded signal (signal type: Electrical Blocks, Electrical Samples)
Comments
The number of samples per bit is given by the ratio of SampleRate/BitRate and has to
be a power of two. The sample rate sets the bandwidth of the electrical signal to be
(sample rate)/2.
16
17
Rise Time Adjustment
Purpose
The module is a Gaussian filter that transforms, for example, rectangular
electrical input pulses into smoother output pulses with a user-defined rise
time.
Inputs
input = electrical pre-shaped (e.g. NRZ/RZ) pulses (signal type: Electrical
Blocks)
Outputs
output = electrical pulses with a user-defined rise-time (signal type: Electrical
Blocks)
18
19
Laser CW
Purpose
The module produces a continuous wave (CW) optical signal.
Outputs
output = continuous wave optical signal (signal type: Optical Blocks, Optical Samples)
Functions
SampleRate-EmissionFrequency-AveragePower-Linewidth-Azimuth-Ellipticity-InitialPhase
20
Laser Rate Equations
Purpose
Dynamic properties of laser emitters, such as relaxation oscillation,
turn-on jitter, laser chirp, etc. can significantly affect the performance
of optical communication systems, if a direct laser modulation is used.
A “system laser model” described in the module Laser CW takes into
account the spectral and noise properties of the laser transmitters, but
ignores their dynamic behavior. Although the Laser CW model is
suitable for a description of externally modulated CW-lasers, it fails to
simulate the directly modulated lasers.
21
Externally modulated laser
transmitter
Purpose
The module simulates an externally modulated laser. This module is a galaxy
and consists of a cw laser, a PRBS generator, an NRZ coder, a rise time
adjustment and a Mach-Zehnder modulator.
Outputs
output = optical modulated signal (signal type: Optical Blocks)
22
23
Non Linear Dispersive Fiber
Purpose
The module solves the nonlinear Schrödinger (NLS) equation
describing the propagation of linearly polarized optical waves in
fibers using the split-step Fourier method.
The model takes into account stimulated Raman scattering (SRS),
four-wave mixing (FWM), self-phase modulation (SPM), cross
phase modulation (XPM), first order group-velocity dispersion
(GVD), second order GVD and attenuation of the fiber.
For parameterized signals (CW representation) an ordinary
differential equation system taking into account stimulated Raman
scattering (SRS) and frequency depended attenuation is applied.
Inputs
input = optical signal
(signal type: Optical Blocks)
Outputs
output = optical signal
(signal type: Optical Blocks)
24
Ideal Amplifier
Purpose
This module simulates a system-oriented amplifier with a wavelength
independent gain and noise figure behavior. By parameter selection the
module may act in a gain-controlled, output-power-controlled, or saturating
(uncontrolled) mode. The model is not only restricted to high gain
amplifiers but is also valid for low gain and even damping amplifiers.
Inputs
input = optical signal
(signal type: Optical Blocks, Optical Samples)
Outputs
output = optical signal
(signal type: Optical Blocks, Optical Samples, corresponding to the
input)
25
Attenuator
Purpose
The module attenuates the optical signal.
Inputs
input = optical signal (signal type: Optical Blocks, Optical Samples)
Outputs
output = optical signal (signal type: Optical Blocks, Optical Samples)
26
Coupler
Purpose
The module models an optical coupler for combining or splitting of
optical signals. It
can also be used as a physical signal splitter for signal check.
Inputs
input1 = optical signal (signal type: Optical Blocks, Optical Samples)
input2 = optical signal (signal type: Optical Blocks, Optical Samples)
Outputs
output1 = optical signal (signal type: Optical Blocks, Optical Samples)
output2 = optical signal (signal type: Optical Blocks, Optical Samples)
27
Isolator
Purpose
The module acts an ideal isolator.
Inputs
inForward = optical signal (signal type: Optical Blocks)
inBackward = optical signal (signal type: Optical Blocks)
Outputs
outForward = optical signal (signal type: Optical Blocks)
28
Circulator
Purpose
This module simulates a non-ideal clockwise circulator.
Terminals
in1 = optical input forward at port 1 (signal type: Optical Blocks)
in2 = optical input forward at port 2 (signal type: Optical Blocks)
in3 = optical input forward at port 3 (signal type: Optical Blocks)
Outputs
out1 = optical input forward at port 1 (signal type: Optical Blocks)
out2 = optical input forward at port 2 (signal type: Optical Blocks)
out3 = optical input forward at port 3 (signal type: Optical Blocks)
29
Photodiode PIN
Purpose
The module acts as a PIN photodiode with additive Gaussian white noise sources.
Inputs
input = optical signal (signal type: Optical Blocks, Optical Samples)
Outputs
output = electrical signal (signal type: Electrical Blocks, Electrical Samples)
30
Clock Recovery Ideal
Purpose
The module determines the time delay between the incoming signal and the original
signal, which is automatically regenerated from the specified logical information attached
to the incoming signal without the need of a reference input. Thus, this module
acts as an ideal clock recovery.
Inputs
input = electrical signal (signal type: Electrical Blocks)
Outputs
output = electrical signal, which is a delayed copy of the input (signal type: Electrical Blocks)
Description
The module synchronizes the incoming electrical signal with the original transmitted signal. The
original signal is regenerated from the specified logical information channel attached to the physical
signal. From logical information, like the digital bit stream, pulse shape, coding type, modulation
type, and bit rate, a copy of the initially sent signal is built. The time delay is calculated from the
cross correlation of the incoming electrical signal and the internally regenerated original signal. The
incoming signal is then shifted in time, so that the electrical output signal is a time delayed copy of
the incoming signal.
31
Optical Spectral Analyzer
Purpose
This module is an Optical Spectrum Analyzer (OSA).
Inputs
input (multiple) = optical signal (signal type: Optical Blocks)
32
Time Domain Visualizer
Purpose
This module displays electrical and optical signal waveforms (in the time domain).
Input
input (multiple)= input signal
(signal type: Optical Blocks, Optical Samples, Electrical Blocks, Electrical Samples)
33
Eye Diagram (Part of Time domain
Visualizer)
An eye pattern is obtained by superimposing the actual
waveforms for large numbers of transmitted or received symbols
34
Eye Diagram (Part of Time domain
Visualizer)
The signal must not intrude into the shaded areas
35
Eye Diagram (Part of Time domain
Visualizer)
36
Power meter
Purpose
The module is a power meter and may be used for power calculations.
Input
input = optical signal (signal type: Optical Blocks)
Output
output = optical power (signal type: Float)
37
Bit Error Rate Estimation
Purpose
The module evaluates the system performance by estimating the bit error rate
(BER) using a Gaussian approximation. The influence of intersymbol interferences
(ISI) can also be taken into account.
The module uses the bit sequence from input port bits to determine the marks and
spaces in the received signal.
Inputs
input = Input of electrical signal. (signal type: Electrical Blocks)
bits = Bit sequence originally sent. (signal type: int)
Outputs
ber = Average BER over sampled time slot. (signal type: float)
q = Q-value over sampled time slot. (signal type: float)
38
So what is your task?
You have to solve the assigned
simulation problems
Remember: Those simulations
are 10% of your final mark.
39