Coherent QAM-M OFDM Fiber Optic Communication Systems

 

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Design and Simulation of Coherent QAM-M OFDM Fiber Optic
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Simulation Setup

 

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1. Fiber Optic Coherent OFDM Communication System (Full Simulation Setup)

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Block Diagram of an Optical OFDM System

Opt. mod.= optical modulator, P/S = parallel to serial, S/P = serial to parallel

 

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4. Fiber Optic Coherent OFDM Communication System (Transmitter)

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Block Diagram of an Optical OFDM Transmitter

S/P = serial to parallel, P/S = parallel to serial, DAC = digital to analog converter
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5. Fiber Optic Coherent OFDM Communication System (IQ Modulator)

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Block diagram of an Optical IQ modulator

MZM = Mach-Zehnder modulator, DAC=digital to analog converter

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6. Fiber Optic Coherent OFDM Communication System (Receiver)

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Block Diagram of an Optical OFDM Receiver

S/P = serial to parallel, ADC = analog to digital converter, DSP = digital signal processing

 

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Selected Simulated Results Using this Module

 

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7. Real Part of the OFDM data in a frame (at Transmitter)

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Real Part of OFDM Data in a Frame at Tx

 

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8. Imaginary Part of the OFDM Data in a Frame (at Transmitter)

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Imaginary Part of OFDM Data in a Frame at Tx

 

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9. Real Part of the Signal after IFFT (at Transmitter)

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Real Part of the Signal after IFFT at Tx

 

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10. Imaginary Part of the Signal after IFFT (at Transmitter)

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Imaginary Part of the Signal after IFFT at Tx

 

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11. OFDM Spectrum Before the Fiber Optic Link

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OFDM Spectrum Before the Fiber Optic Link

 

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12. Real Data with Equalizer and wo Equalizer (at Receiver)

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Real Data with Equalizer (red) and without Equalizer (green) at Receiver

Original Data is also shown (blue)

 

 

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