How to Implement Optical fiber in OMNeT++

To implement an optical fiber communication system in OMNeT++ has needs to modelling the components of an optical network like transmitters, receivers, fibre links, and amplifiers.

Let our team handle your Optical fiber implementation in OMNeT++ efficiently. We focus on all the key mechanisms of optical networks, including transmitters, receivers, fiber links, and amplifiers, tailored to your projects for top-notch results. With all the latest tools at our disposal, we’ll make sure your work is completed on schedule. The given below are the procedures to implement a simple optical fiber communication system in OMNeT++ with practical examples.

Step-by-Step Implementation:

1. Define the Optical Fiber Communication Architecture

• Components: Classify the key components of the optical network, such as:
  • Optical Transmitter (Laser)
  • Optical Receiver (Photodetector)
  • Optical Fiber Link
  • Optical Amplifiers (e.g., EDFA)
  • Multiplexers/Demultiplexers (for WDM systems)
• Communication: State how the information will be transferred over the optical fibre, that has modulation schemes and signal propagation features.

2. Create OMNeT++ Modules for Each Component

• Optical Transmitter Module: Design the laser source that involves modulation of the optical signal.
• Optical Receiver Module: To emulate the photodetector has conversion of optical signals to electrical signals.
• Optical Fiber Link Module: Design signal propagation via the optical fiber that involves attenuation and dispersion effects.
• Optical Amplifier Module: To emulate the signal amplification to compensate for losses.

Example: Optical Transmitter Module

simple OpticalTransmitter {

parameters:

double wavelength @unit(“nm”) = default(1550); // Wavelength in nanometers

double power @unit(“mW”) = default(1); // Output power in milliwatts

gates:

out opticalOut; // Optical signal output

}

Example: Optical Receiver Module

simple OpticalReceiver {

parameters:

double sensitivity @unit(“dBm”) = default(-30); // Receiver sensitivity

gates:

in opticalIn; // Optical signal input

}

Example: Optical Fiber Link Module

simple OpticalFiber {

parameters:

double length @unit(“km”) = default(10); // Fiber length in kilometers

double attenuation @unit(“dB/km”) = default(0.2); // Attenuation in dB per kilometer

double dispersion @unit(“ps/nm/km”) = default(17); // Dispersion parameter

gates:

in opticalIn;  // Input optical signal

out opticalOut; // Output optical signal

}

3. Implement the Internal Logic of Each Component

• Optical Transmitter Logic: To mimic the modulation process, converting electrical signals to optical signals.
• Optical Receiver Logic: To apply the detection process, converting optical signals back to electrical signals.
• Optical Fiber Link Logic: To execute signal attenuation, dispersion, and other impairments that occur during propagation.
• Optical Amplifier Logic: Mimic the amplification process that has noise figure and gain.

Example: Optical Transmitter Logic in C++

#include <omnetpp.h>

class OpticalTransmitter : public omnetpp::cSimpleModule {

protected:

virtual void handleMessage(omnetpp::cMessage *msg) override;

};

Define_Module(OpticalTransmitter);

void OpticalTransmitter::handleMessage(omnetpp::cMessage *msg) {

// Simulate optical signal generation

send(msg, “opticalOut”);

}

Example: Optical Fiber Link Logic in C++

#include <omnetpp.h>

class OpticalFiber : public omnetpp::cSimpleModule {

protected:

virtual void handleMessage(omnetpp::cMessage *msg) override;

};

Define_Module(OpticalFiber);

void OpticalFiber::handleMessage(omnetpp::cMessage *msg) {

// Simulate signal attenuation and dispersion

double attenuation = par(“attenuation”).doubleValue();

double length = par(“length”).doubleValue();

double powerLoss = attenuation * length;

// Modify the signal to represent attenuation

sendDelayed(msg, 0.001, “opticalOut”); // Propagation delay

}

4. Integrate the Components in a NED File

• Define the connections between the optical transmitter, fiber link, and receiver.
• If using amplifiers, connect them appropriately along the fiber link.

Example: Optical Communication System Integration in NED

network OpticalNetwork {

submodules:

transmitter: OpticalTransmitter {

parameters:

wavelength = 1550;

power = 1;

}

fiber: OpticalFiber {

parameters:

length = 50; // 50 km fiber

attenuation = 0.2;

dispersion = 17;

}

receiver: OpticalReceiver {

parameters:

sensitivity = -30;

}

connections allowunconnected:

transmitter.opticalOut –> fiber.opticalIn;

fiber.opticalOut –> receiver.opticalIn;

}

5. Run and Analyse the Simulation

• Compile: Make sure that all modules are compiled in OMNeT++.
• Execute: Execute the simulation and observe the optical signal propagation, attenuation, and reception.
• Analyse: Use OMNeT++ tools to Measure signal quality, power levels, and bit error rates.

6. Advanced Features

• Wavelength Division Multiplexing (WDM): To execute WDM by generating multiple optical channels and using multiplexers and demultiplexers.
• Nonlinear Effects: To mimic nonlinear effects like self-phase modulation (SPM) and four-wave mixing (FWM).
• Amplifier Models: Execute more detailed models for optical amplifiers that has gain saturation and noise figure.

Example: Wavelength Division Multiplexing (WDM)

1. Multiplexer: Integrate multiple optical signals at various wavelengths into a single fiber.
2. Demultiplexer: Isolate the combined signal back into individual wavelengths at the receiver end.

Example: WDM Multiplexer in NED

simple WdmMultiplexer {

gates:

in opticalIn[4]; // 4 input wavelengths

out opticalOut;  // Combined output

connections:

// Combine the inputs into the output

opticalIn[0] –> opticalOut;

opticalIn[1] –> opticalOut;

opticalIn[2] –> opticalOut;

opticalIn[3] –> opticalOut;

}

In the end of the simulation, we know and get knowledge about how to execute the optical fiber using OMNeT++ tool. If you need more information regarding the optical fiber we will provide that too.