Software for passive optical networks PON WDM

User Manual – Pon Design Software.

PON DESIGN SOFTWARE
PROGRAM FOR THE DESIGN OF WDM PASSIVE OPTICAL NETWORKS

Aralyteck Communications
2010

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Aralyteck Communications – Software solutions for networks
http://aralyteck.jimdo.com
E-mail: aralyteck@gmail.com


MAIN TOPICS
Pág.

PASSIVE OPTICAL NETWORKS ... ... ... ... ... ... ... ... ... ... ... ... .... . 3

MANAGEMENT SOFTWARE... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .5

I WANT THIS SOFTWARE .......................................................... 34

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PASSIVE OPTICAL NETWORKS
A passive optical network is a broadcast physical topology in which all ONU receive the full
signal (the superposition of the lengths of the channels of information). The separation
between the signals that are directed at each of the subscribers is carried out in the ONU.

Passive Optical Network Design
In general, power levels in the network are affected by the loss of the optical couplers
and the attenuation of signals over optical fiber links. There arises the need for optical
amplification. The PON network design is based on the calculation of minimum required
number of optical amplifiers and its suitable location on the various links of the network,
based on power budgets required for the performance of signal detection.

The following figures illustrate the architecture of such networks:

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PON architecture

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Each network consists of N stations, M passive optical star couplers, A amplifiers and W
fiber optics links. Such networks are also known as optical networking LAN / MAN. Each
station consists of a transmitter that operates with a single wavelength on its channel, and
under a receiver or receivers to receive signals from other stations.

The stars are passive optical devices with multiple ports of entry and exit, its main
function is to combine the power input ports X and divide it into power output to Y ports.
These are elements that also generate losses.

Optical amplifiers compensate for the losses suffered by the signals to propagate through
optical fibers and the stars.

MANAGEMENT PON DESIGN SOFTWARE
About PDS

PON DESIGN SOFTWARE (PDS) is program that allows you to design passive optical
networks using optical fiber links, is a complete computer-aided engineering and the
power to:

-Analyze the consistency and feasibility of the design of the user.

- Calculate a minimum amount of optical amplifiers in the network designed.

-Report the exact location of each amplifier in the network.

-Perform spectral analysis to calculate the bandwidth used for each section of optical
fiber communication system.

PDS consists of two main modules, the network design program and the program of
spectral analysis.

Requirements

- Windows operating system (xp, vista, 7).

- 512 MBytes RAM.

-Microsoft Office Excel.

The requirement of Excel for Windows is because of convenience, PDS module displays
the results of network design in a spreadsheet, so the designer can make complementary

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treatments such as plotting, reporting, statistical analysis, among others. It is necessary to
clarify that the algorithms and calculations of PDS at any time using the tools of Excel, It is
used to show results.

Software Installation

Elements of PDS installation folder.

Installing the PDS.

The installation wizard will guide the user in the configuration steps. If you choose the
standard option, the program will be installed between the environments of the Windows
Start button, as shown below.

Starting the software

When you run the program installed, you will find the following sequences on the screen:

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PDS initial screen.

Introductory screen.

The password previously provided to allow users to activate the software resource.

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Using PON DESIGN SOFTWARE

Network Design Module

Display network design module.

The network design module is in the main window of PDS.

COMPONENT DESCRIPTION
1 Menu
2 New design
3 Open design
4 Save layout
5 Internet PDS
6 Run entirely linear algorithm
7 Network Device Window
8 Add a star network
9 Add a group of network stations
10 Workspace

Components of the network design module.

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Designing a passive optical network PDS

For practical purposes we use a classic example of PON network.

Example PON network.

Technical data of the devices used in network design:

Pmax 0 dBm
PSEN -30 DBm
0.2 dB /
km
10 dBm
PNONLINMAX
Gmax 20 Db
PSAT 1.55 dBm

Technical data of the sample network.

The network consists of four optical stars and three groups of stations. In the PDS, optical
star should be added by clicking the star button; the device will emerge at the top right as
shown below.

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Design environment.

It is done then clicks once with the left mouse button on the star, the same change to red,
the button is released and the star moves into the work area.

Moving a star.
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After determining the location shall again have to click the left mouse button. Be placed
in the same way the three remaining stars and groups of stations.

Placement of network components.

Now is necessary to interconnect the devices using optical fiber links. For that purpose
should be pressed with the right mouse button the star 1 (S1) and displayed in the
window select the connection-adding options. LINK window will appear then you should
select star 2 (S2) and introduce the distance between them, 100 km. Finally, click on the
OK button.

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Interconnecting the optical star.

Just viewing a link, but in reality the program is adopted as a double bond, S1 to S2 and
from S2 to S4, so it is not necessary to try to connect S2 to S1, the program did. In the
same way you do with the other connections and according to the distances to terminate
the links between stars, which are red.

Links between stars.

Shall precede access links, for this is clicked at the stations and are connected to the stars
the same way as was explained in the preceding paragraphs. It is necessary to clarify that
only one group of stations can be connected to a single star, the link can only be done in
the group of stations to the star and not the other, but the program is still taking a double
bond. Access links are blue.

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Access links.

Entering the number of stations

Double click is performed on each group of stations; you'll see the following window:

Optical window stations.

In the box of “Number of stations” introduces the number of stations in each group,
according to the example, sg1 has 20 stations. You must complete this form for each
group of stations.

How to check the degree of each star?

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Double clicking on each star optical access to a useful window that stores the degree of
each star and the losses generated within the network. Below is the registration of the
star 1.

Optical star window.

Solving the network

To run the network solution will have two options, the first is to click on the option
Integer Linear Algorithm Run menu tab and the second pressing element 6, Integer Linear
Algorithm button.

Options for implementing the network solution.

After running the network solution, a window named "Logic Window" will be present and
which allows the user to observe the state of the solution process of the program. The
process consists of four steps (global optimization methodology).

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Status Window network solution.

Consistency of design

The program will analyze the design by the user at the level of physical connections in
order to ensure the normal development process.

Window design consistency.

If the design is correct, i.e. if no device is isolated, immediately proceed to apply the
feasibility test. Otherwise visualize any of the following issues identified:

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There is not some optical star in the work area There is not links or more stations
Missing links between one or more stars There is one or more optical stars with no
connection

Then be required to correct design and implement network solution again.

Viability test

Viability test window.

When the design is consistent the program does the first step of global optimization
method. For this you need to enter the parameters of the devices. It then deployed a set
of windows according to the network that we take as example the values entered.

Device Parameters

Optical amplifiers

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In this window the user assign values for maximum small-signal gain and saturation
power.

Parameters of optical amplifiers.

Optical fiber

Through the window properties specified the values of the decay constant of the fiber,
the length of fiber spool, and number of connectors, the connector’s losses and
additional.

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Parameters for the optical fiber.

Star Optical

In addition to the losses inherent division optical couplers, the designer can enter the
value for other losses.

Optical coupling window.

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Amplifiers power levels and stations.

In this window enter the values of sensitivity and maximum power in the network.

Network parameters.

Standardization Window

PDS ensures that the network variables are consistent with ITU-T recommendations,
specifically with reference contained in the ITU G.139, so it has included a detection
module to indicate the designer with the values that are outside the international
standard. Example if you enter a maximum small signal gain of 26 dB for optical amplifiers,
you will see the following window:

Window standardization.

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The user can modify the parameters by pressing the Revise button or leave them as they
are pushed Next. The software will allow the research process to allow the designer to
work outside of the ITU recommendations.

The program also provides quick help for designers, each window for entry of parameters
has a small check box to restore the typical values of PON.

Resetting values.

THE NETWORK IS NOT VIABLE!

When a network is not viable, ie can not be implemented according to specifications
provided by the designer, the program immediately displayed a message, indicating the
problem identified and the source of the network and type link. The following figure
shows an example of notification.

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PDS program tells the user the possible solutions to present difficulties in the design,
access to this powerful application, you must click on the Help button on the notification
window, a window will then open alternative options, as follows:

In this way the designer shall meet the suggested solutions and make the right decision,
whether to modify the design of the network, or otherwise proceed with the design but
changing the parameters of transmission. If the user chooses the latter alternative must
click on the button automated solution.

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Thus, PDS will implement the solution process for the network designed.

VIABLE NETWORK
ALGORITHM INTEGER LINEAR AND AMPLIFIERS LOCATION

When the design is feasible, ie it is possible to place the amplifiers in the network. PDS
makes full use of its location and linear amplifiers algorithms, then displays the results in a
spreadsheet in Microsoft Excel.

Amplifiers location window.

RESULTS REPORT SPREADSHEET

The software will eventually generate the report from the network solution in Microsoft
Office Excel program.

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Report results

The report has four main sections, which are:

1. Parameters of the devices.
2. Results of the links between stars.
3. Results of access links.
4. Output powers of the optical star.

Device Parameters

The spreadsheet generates a table that shows the values assigned by the designers.

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Report device parameter

Results of the links between stars

This section shows the number of amplifiers in each link between stars of the network
and the location of each of the amplifiers. Note the outcome of the link in the sense star
1 to star 2:

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Report links between stars

Basically you create two tables. In the first of which shows the bond distance and the
number of amplifiers in the same, the second table is more specific and displays the
distance between the star to of each amplifier and its gain.

Results of access links

In this part of the solution is a link between stations and optical passive couplers in each
direction. The structure is similar to the previous one. Note the result of a link between
the star and a group of stations.

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First we report the solution in the direction of star-station group and then the opposite
way. The presentation of results is interpreted in the same way that links stars

Report star to station link

Just a box is included in the tables, # links to indicate the number of stations per each
group of stations; in this case an amplifier is required per link, as are 20 stations will
require a total of 20 amps for links between star 1 and the group of stations.

At the end of this third section displays the result of integer linear algorithm, the
objective of designing passive optical networks.

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Response objective function.

Output powers of the optical star

It is useful to know the power output at each optical coupler, these results are the
simulation of network behavior and its budget power. In the last section these quantities
are reported.

Report output power per wavelength in the stars.

If the reader compares the results of software design program PDS with the classical
network solution taken as an example, may show its potential and accuracy.

SPECTRAL ANALYSIS MODULE

Upon completion of the network design module the user has the possibility of using
spectral analysis module. This second part of the program will see the operation of the
network with the given solution at the level of bandwidth. Clicking the button will
activate the user to accept all the resources of the module.

Starting the spectral analysis module

As in network design module, the designer must enter the values of the parameters that
will study the behavior of the network.

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Starting the spectral analysis module.

In this way the windows were activated sequentially for entering values.

Selecting the type of optical fiber

Selecting the type of fiber.

The designer will choose one of the classifications of modes of propagation in the fiber
optics. Please remember that the bandwidth in the optical fiber depends on the bond
distance and a total rise time of the optical fiber, which varies according to the nature of
this mode of transmission.

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Optical Specifications

Specifications of fiber.

In this window you must enter selected depending on the fiber, the modal bandwidth,
chromatic dispersion and the gamma value.

Optical Equipment Specifications

Specifications of optical equipment.

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You enter the value of the speed transmitter (stations), the spectral width of the light
generator, the rise time of the light generator, the rise time of the light sensor, the
working wavelength and the index refraction of the optical fiber.

Starting the spectral analysis module

After entering the values for the spectral analysis is initiated following screen:

Main window spectral analysis module.

First the user selects the source device to analyze the link, in the source table can choose
between a star and a group of optical stations.

Device Selection origin.

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The system will immediately identify all the stars or group of stations enable design and
selected to the second box. The next step should be the choice of the number of the
device from either star or group of stations. Suppose we want to analyze the link
between star 1 and star 2. In which case, proceed as follows:

Selecting the target device.

The program displays the distance between stars (100 km) and amplifiers in the link in
that direction (2). By the following graph we show the situation:

Distance values for binding S1-S2.

Then you must choose the segment graph can be between the star number 1 (S1) and
amplifier number 1 (1), between the amplifier 1 and amplifier 2, between the amplifier 2
and the star 2 (S2). If you choose the segment of the amplifier 2 to the star 2, one must
select the number 2 on the list of item A, the program will automatically identify the next
device (A +1) in this case S2.

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Selection graph segment.

Then the program does the graph of the spectrum amplitude versus frequency and
indicates the total electrical bandwidth of the link.

Amplitude spectrum

The absolute value of the frequency could be reallocated to see the graph in different
ways. You can work in a range of 1MHz to 999MHz.

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Effects of absolute change in frequency

Finally we include the results of the calculations in the bottom of the screen. The rise
times for the modal and chromatic dispersion and the total bandwidth of optical fiber
power on that link.

Numerical solutions to the bandwidth of the fiber.

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Other utilities PDS

Other utilities PDS.

The software contains options for creating a new design, open an existing network,
keeping the current design and consult the website of the software.

I want this software........
The development system more advanced and intelligent for the design and
implementation of passive optical networks can be yours in record time, just send us your
purchase request to our e-mail and will be surprised to incorporate into his work schedule
a full engineering program assisted by computer. Not only simulate, design without fear!

Contact:

softpondesign@gmail.com

aralyteck@gmail.com

Links:

http://pondesignsoft.blogspot.com

Thanks for reading this document.
Aralyteck Communications Team.


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Software for passive optical networks PON WDM

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