How to Implement Optical Communication in OMNeT++

To implement an optical communication in OMNeT++ has needed to embraces to making a model situation that consist of optical transmitters, receivers, and possibly intermediate nodes like optical amplifiers or switches. Towards sustenance optimal communication functionalities which can be comprehensive by the INET framework.  Now, given below is a procedure to the elementary optical communication in OMNeT++ by using the INET framework.

Step-by-Step implementations:

Step 1: Install OMNeT++ and INET Framework

1. Download OMNeT++:
   • Go to theOMNeT++ download the up-to-date form.
2. Install OMNeT++:
   • For the operating system keep on the installation instructions provided on the website.
3. Download and Install INET Framework:
   • The INET framework is frequently by using with OMNeT++ for the internet protocols providing by this framework.
   • From the INET website to download it. Step 2: Set Up Your Project

1. Create a New OMNeT++ Project:
   • Open the OMNeT++ IDE.
   • Go to File -> New -> OMNeT++ Project.
   • Arrive a project name and choice the suitable options.
2. Set Up Directory Structure:
   • Make sure to the project have the essential files, like src for source files and replications for NED files and conformation.
3. Add INET to the Project:
   • Right-click on the project in the Project Explorer.
   • Handpicked Properties -> Project References.
   • Form the box for INET.

Step 3: Define Optical Network Models Using NED

1. Create NED Files:
   • In the src directory, make a new NED file like OpticalNetwork.ned.

• Outline the network topology in the NED file. Given below is the sample example:

package optical;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

import inet.mobility.static.StationaryMobility;

import inet.physicallayer.common.packetlevel.RadioMedium;

network OpticalNetwork

{

parameters:

int numNodes = default(5);

submodules:

sender: StandardHost {

@display(“p=100,100”);

mobility.typename = “StationaryMobility”;

}

receiver: StandardHost {

@display(“p=400,100”);

mobility.typename = “StationaryMobility”;

}

relay[numNodes]: StandardHost {

@display(“p=200+100*i,200”);

mobility.typename = “StationaryMobility”;

}

connections allowunconnected:

for i=0..numNodes-1 {

relay[i].wlan[0] <–> relay[(i+1) % numNodes].wlan[0];

}

sender.wlan[0] <–> relay[0].wlan[0];

relay[numNodes-1].wlan[0] <–> receiver.wlan[0];

}

Step 4: Implement Optical Communication Logic

1. Extend INET’s Physical Layer for Optical Communication:
   • INET’s physical layer can be extended to support optical communication functionalities. You may need to create new classes or extend existing ones to include optical modulation and demodulation.
2. Create C++ Modules for Optical Communication:
   • In the src directory, make a new C++ classes like OpticalTransmitter.cc and OpticalReceiver.cc.
   • Embrace required OMNeT++ headers and express the optical communication logic.
3. Optical Transmitter Implementation:

#include <omnetpp.h>

#include “inet/applications/base/ApplicationBase.h”

#include “inet/common/packet/Packet.h”

using namespace omnetpp;

using namespace inet;

class OpticalTransmitter : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void sendOpticalMessage();

void handleOpticalMessage(cPacket *pkt);

cMessage *sendEvent = nullptr;

};

Define_Module(OpticalTransmitter);

void OpticalTransmitter::initialize(int stage)

{

ApplicationBase::initialize(stage);

if (stage == INITSTAGE_LOCAL) {

sendEvent = new cMessage(“sendOpticalMessage”);

scheduleAt(simTime() + par(“startTime”), sendEvent);

}

}

void OpticalTransmitter::handleMessageWhenUp(cMessage *msg)

{

if (msg == sendEvent) {

sendOpticalMessage();

scheduleAt(simTime() + par(“sendInterval”), sendEvent);

} else {

cPacket *pkt = check_and_cast<cPacket *>(msg);

handleOpticalMessage(pkt);

}

}

void OpticalTransmitter::sendOpticalMessage()

{

// Create and send an optical message to the next node

EV << “Sending optical message” << endl;

Packet *pkt = new Packet(“OpticalMessage”);

pkt->setByteLength(par(“messageSize”));

send(pkt, “lowerLayerOut”);

}

void OpticalTransmitter::handleOpticalMessage(cPacket *pkt)

{

// Handle received optical message

EV << “Received optical message: ” << pkt->getName() << endl;

delete pkt;

}

1. Optical Receiver Implementation:

#include <omnetpp.h>

#include “inet/applications/base/ApplicationBase.h”

#include “inet/common/packet/Packet.h”

using namespace omnetpp;

using namespace inet;

class OpticalReceiver : public ApplicationBase

{

protected:

virtual void initialize(int stage) override;

virtual void handleMessageWhenUp(cMessage *msg) override;

void handleOpticalMessage(cPacket *pkt);

};

Define_Module(OpticalReceiver);

void OpticalReceiver::initialize(int stage)

{

ApplicationBase::initialize(stage);

}

void OpticalReceiver::handleMessageWhenUp(cMessage *msg)

{

if (msg->isSelfMessage()) {

delete msg;

} else {

cPacket *pkt = check_and_cast<cPacket *>(msg);

handleOpticalMessage(pkt);

}

}

void OpticalReceiver::handleOpticalMessage(cPacket *pkt)

{

// Handle received optical message

EV << “Received optical message: ” << pkt->getName() << endl;

delete pkt;

}

Step 5: Integrate Optical Modules into Network Model

1. Modify NED File to Use Optical Modules:
   • Apprise the NED file to usage the norm optical transmitter and receiver modules:

package optical;

import inet.node.inet.StandardHost;

import inet.node.inet.Router;

import inet.mobility.static.StationaryMobility;

import inet.physicallayer.contract.packetlevel.IRadioMedium;

import inet.physicallayer.common.packetlevel.RadioMedium;

network OpticalNetwork

{

parameters:

int numNodes = default(5);

submodules:

sender: StandardHost {

@display(“p=100,100”);

mobility.typename = “StationaryMobility”;

@children:

wlan[0].radio.transmitter.typename = “OpticalTransmitter”;

wlan[0].radio.receiver.typename = “OpticalReceiver”;

}

receiver: StandardHost {

@display(“p=400,100”);

mobility.typename = “StationaryMobility”;

@children:

wlan[0].radio.transmitter.typename = “OpticalTransmitter”;

wlan[0].radio.receiver.typename = “OpticalReceiver”;

}

relay[numNodes]: StandardHost {

@display(“p=200+100*i,200”);

mobility.typename = “StationaryMobility”;

@children:

wlan[0].radio.transmitter.typename = “OpticalTransmitter”;

wlan[0].radio.receiver.typename = “OpticalReceiver”;

}

connections allowunconnected:

for i=0..numNodes-1 {

relay[i].wlan[0] <–> relay[(i+1) % numNodes].wlan[0];

}

sender.wlan[0] <–> relay[0].wlan[0];

relay[numNodes-1].wlan[0] <–> receiver.wlan[0];

}

Step 6: Configure Simulation Parameters

1. Create omnetpp.ini:
   • In the simulations directory, generate an omnetpp.ini file.
   • Outline simulation parameters, like the duration and network parameters:

[General]

network = OpticalNetwork

sim-time-limit = 100s

# Mobility

**.relay[*].mobility.bounds = “0,0,1000,1000”

# Optical transmitter and receiver parameters

**.sender.udpApp.startTime = uniform(0s, 10s)

**.sender.udpApp.sendInterval = exponential(1s)

**.sender.udpApp.messageSize = 256B

**.sender.udpApp.localPort = 1000

**.sender.udpApp.destPort = 2000

**.receiver.udpApp.localPort = 2000

Step 7: Build and Run the Simulation

1. Build the Project:
   • In the OMNeT++ IDE, right-click on the project and choice Build Project.
2. Run the Simulation:
   • Go to Run -> Run Configurations.
   • Setting up a fresh run configuration for the project and run the simulation.

Step 8: Analyze Results

1. View Simulation Results:
   • Next the simulation completes, by using OMNeT++’s tools to scrutinize the results.
   • Open the ANF which is Analysis Framework to envision and read the data.

In the scripts, we declare that the execution of the Optical Communication in OMNeT++. We have to making a model situation consists of the receivers, possibly intermediate nodes, and receivers. Now, we glad to offer the more information describe to implement the Optimal Communication in OMNeT++.

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