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Experiments Manual

OPTSIM 5.1 Ex 1. Create a network example Ex 2. Parameter scan Ex 3. Edfa as preamplifier-GS first Ex 4. Spans and EDFA- GS 1 Ex 5. Spans and EDFA using parametric run-GS 2 Ex 6. Iteration Loop and Parametric run-GS 3

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Experiment no 1 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: To create a network in which a 10 Gb/s NRZ optical signal is launched into 50 km of standard single mode fibre. In the receiver section the optical signal is detected using a PIN photo detector. Measurements: Measurements include the electrical spectrum, eye diagram and Q estimation. Components: • Transmitter section: Logical Sources- Data Source; Laser source-CW Lorentzian Laser; Optical

Modulator- Sin 2 Amplitude Modulator; Modulator Driver-NRZ Rectangular • Channel: Fiber • Receiver Section: sensitivity optical Receiver • Measurement components: Optical power Meter, Optical Spectrum Analyser, electrical Scope

Procedure: 1. Create the network as shown in diagram. Check the properties of each component. 2. Simulate the network. 3. Compare the readings of two power meters and find out the reason for difference. 4. Check the optical spectrum analyser’s waveform and compare the centre frequency with the

frequency of laser source. 5. Check the waveform of electrical scope and find out the readings for Eye opening, closing, Q

factor, jitter, BER etc.

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Results- Experiment no 1 1. Optical power at opowme1 Run(s): 1 Power [dBm] = -6.053 Power [mW] = 0.248E+00 2. Optical power at opowme2 Run(s): 1 Power [dBm] = -16.032 Power [mW] = 0.249E-01 3.

4.

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Experiment no 2 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: To create a network in which a 10 Gb/s NRZ optical signal is launched into 10 km of standard single mode fibre. In the receiver section the optical signal is detected using a PIN photodetector. To view the effect when the length of fibre is varied using parameter scan. Measurements: Measurements include the electrical spectrum, eye diagram and Q estimation. Components:

Transmitter section: Data Source; Laser source; Amplitude Modulator; Modulator Driver Channel: Single Mode Fiber Receiver Section: sensitivity optical Receiver Measurement components: Optical power Meter, Optical Spectrum Analyser, electrical Scope

Experiment 2- Diagram 1 Cont.....

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Experiment no 2

Experiment 2- Diagram 2

Procedure: 1. Create the network as shown in diagram 1. Check the properties of each component. 2. Click on symbol button. Then click on Add button. Type a parameter L and value as 10.0. 3. Click on fibre properties/Length. Assign value’ L’ as the length of fibre. 4. Click on Scan button, then click on add column. Param1 as L will be appeared. 5. Click on append row for 6 times. Assign the values of L as 10.0, 20.0, 30.0, 40.0, 80.0, 100.0. 6. Compare the results for all the values. You will find the poorer response as the length

increases. 7. Check the optical spectrum analyser’s waveform for all values of L. 8. Check the waveform of electrical scope and find out the readings for Eye opening, closing, Q

factor, jitter, BER etc, for all values of L.

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Results- Experiment no 2 1. Optical power at opowme1 Run(s): 1 2 3 4 5 6 Power [dBm] = -6.032 Power [mW] = 0.249E+00

2. Optical power at opowme2 Run(s): 1 Power [dBm] = -8.079 Power [mW] = 0.156E+00 ------------------------------------------------------ Optical power at opowme2 Run(s): 2 Power [dBm] = -10.111 Power [mW] = 0.975E-01 ------------------------------------------------------ Optical power at opowme2 Run(s): 3 Power [dBm] = -12.107 Power [mW] = 0.616E-01 ------------------------------------------------------ Optical power at opowme2 Run(s): 4 Power [dBm] = -14.093 Power [mW] = 0.390E-01 ------------------------------------------------------ Optical power at opowme2 Run(s): 5 Power [dBm] = -22.051 Power [mW] = 0.624E-02 ------------------------------------------------------ Optical power at opowme2 Run(s): 6 Power [dBm] = -25.964 Power [mW] = 0.253E-02

3.

Superimposed Optical Spectrum for all runs

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Cont.. Results- Experiment no 2 4.

Superimposed Eye Diagrams for all runs

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Experiment no 3 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: To create a network in which a 10 Gb/s NRZ optical signal is launched into 50 km of standard single mode fiber. In the receiver section a 980-nm pumped EDFA is used a preamplifier. The optical signal is filtered and detected using a PIN photodetector. Measurements: Measurements include the electrical spectrum, eye diagram and Q estimation. Components:

Transmitter section: Data Source; Laser source; Amplitude Modulator; Modulator Driver Channel: Single Mode Fiber Receiver Section: sensitivity optical Receiver; filters, EDFA Measurement components: Optical power Meter, Optical Spectrum Analyser, electrical Scope

Path: ProductInstDir/examples/optsim/sample_mode/Getting_started/First

Procedure: 1. Open the network from the given path or create the network by selecting the components

from the Model Palettes as shown in diagram. Check the properties of each component. 2. Simulate the network. 3. Check the waveform of electrical scope and find out the readings for Eye opening, closing, Q

factor, jitter, BER etc. 4. Compare the readings of two electrical scopes and find out the reason for difference.

Compare them using superimpose option. For this, open one waveform then go to Optsim data display block. Then click on another waveform (run 1). Then click on superimpose button.

5. For more details, go through application notes guide.

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Results- Experiment no 3

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Experiment no 4 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: A 9.953 Gb/s NRZ optical signal is launched into 3 spans of Dispersion Shifted Normal fiber, each 50 km in length. The fiber loss is recovered by 980- nm pumped EDFA before each span and after the third span. The optical signal is passed through a raised-cosine filter and detected by a sensitivity receiver. The electrical output of the receiver is passed through a Bessel filter. Measurements: Measurements include the optical spectrum, detected electrical spectrum, eye diagram and Q estimation

Path: ProductInstDir/examples/optsim/sample_mode/Getting_started/Getting_started_1

Procedure: 1. Open the network from the given path or create the network by selecting the components

from the Model Palettes as shown in diagram. Check the properties of each component. 2. Simulate the network. 3. Check the waveform of all optical spectrums by superimposing them. Also look Eye Diagram

in electrical scope and find out the readings for Eye opening, closing, Q factor, jitter, BER etc. 4. Compare the readings of Electrical Spectrum in two electrical scopes and find out the reason

for difference. Compare them using superimpose option. For this, open one waveform then go to Optsim data display block. Then click on another waveform (run 1). Then click on superimpose button.

5. For more details, go through application notes guide.

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Results- Experiment no 4

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Cont.. Results- Experiment no 4

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Experiment no 5 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: A 9.953 Gb/s NRZ optical signal is launched into 3 spans of Dispersion Shifted Normal fiber, each 50 km in length. The fiber loss is recovered by 980- nm pumped EDFA before each span and after the third span. The optical signal is passed through a raised-cosine filter and detected by a sensitivity receiver. The electrical output of the receiver is passed through a Bessel filter. The parametric run feature is introduced to show how it may be used to vary the optical attenuation at the receiver. Measurements: Measurements include the optical spectrum, detected electrical spectrum, eye diagram and Q estimation

Path: ProductInstDir/examples/optsim/sample_mode/Getting_started/Getting_started_2

Procedure: 1. Open the network from the given path or create the network by selecting the components

from the Model Palettes as shown in diagram. Check the properties of each component. 2. Click on scan button. Click on symbols and scan parameter. Check for the different

parameters assigned to Rx_attn. Click on Start: Parameter Scan. 3. Check the waveform of all optical spectrums by superimposing them. Also look Eye Diagram

in electrical scope and find out the readings for Eye opening, closing, Q factor, jitter, BER etc. 4. Compare the readings of Electrical Spectrums in electrical scopes for various values of

Rx_attn and find out the reason for difference. Compare them using superimpose option. For this, open one waveform then go to Optsim data display block. Then click on another waveform (run 1). Then click on superimpose button.

5. For more details, go through application notes guide.

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Results- Experiment no 5

Superimposed Optical Spectrum output for Run 1. Similarly take output for Run 2, 3, 4.....

Superimposed Electrical Spectrum output for Run 1. Similarly take output for Run 2, 3, 4.....

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Experiment no 6 Prerequisite: OptSim User Guide- section 2.2- ‘Setting up your first simulation’

Aim: A 9.953 Gb/s NRZ optical signal is launched into an iteration loop of 3 spans of Dispersion Shifted Normal fiber, each 50 km in length. The optical signal is passed through a raised-cosine filter and detected by a sensitivity receiver. The electrical output of the receiver is passed through a Bessel filter. The parametric run feature is introduced to show how it may be used to vary the optical attenuation at the receiver. Measurements: Measurements include the optical spectrum, detected electrical spectrum, eye diagram and Q estimation

Path: ProductInstDir/examples/optsim/sample_mode/Getting_started/Getting_started_3

Procedure: 1. Open the network from the given path or create the network by selecting the components

from the Model Palettes as shown in diagram. Check the properties of each component. 2. Click on scan button. Click on symbols and scan parameter. Check for the different

parameters assigned to Rx_attn. Click on Start: Parameter Scan. 3. Check the waveform of all optical spectrums by superimposing them. Also look Eye Diagram

in electrical scope and find out the readings for Eye opening, closing, Q factor, jitter, BER etc. 4. Compare the readings of Electrical Spectrums in electrical scopes for various values of

Rx_attn and find out the reason for difference. Compare them using superimpose option. For this, open one waveform then go to Optsim data display block. Then click on another waveform (run 1). Then click on superimpose button.

5. For more details, go through application notes guide.

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Results- Experiment no 6

Superimposed output of b49-Span1, 2, 3; Run 1

Superimposed output of Output_third_Span and Output_filtered; Run1.

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Cont.. Results- Experiment no 6

Output of Eye Diagram from “Received”; Run1

Superimposed output of Electrical Spectrum of Received and Received_Prefilter; Run1.