Dual Polarization QAM-M CO-OFDM Communication Systems

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Design and Simulation of Dual Polarization QAM-M CO-OFDM Fiber Optic Communication

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Systems with OCSim Module

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This module takes into account (1) Dispersion, (2) Nonlinearity, (3) PMD Compensation, (4) Random Coupling between Polarizations

in the Fibers and (5) FEC

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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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.fig-6_fiber-optic-dp-co-ofdm_rx

 

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Block Diagram of a Dual Polarization 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

 

.fig-7_fiber-optic-dp-co-ofdm_constellation_tx

 

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Constellation Diagram at Tx

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

.fig-8_fiber-optic-dp-co-ofdm_constellation_output-of-fo-link

 

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Constellation Diagram at the Output of FO Link

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

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fig-9_fiber-optic-dp-co-ofdm_contellation_seg-2

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Constellation Diagram after CD and PMD Equalization with no. of fiber segments 2 (160 km)

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

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fig-10_fiber-optic-dp-co-ofdm_constellation_seg-4

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Constellation Diagram after CD and PMD Equalization with no. of fiber segments 4 (320 km)

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

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fig-11_fiber-optic-dp-co-ofdm_constellation_seg-8

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Constellation Diagram after CD and PMD Equalization with no. of fiber segments 8 (640 km)

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

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fig-12_fiber-optic-dp-co-ofdm_constellation_seg-10

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Constellation Diagram after CD and PMD Equalization with no. of fiber segments 10 (800 km)

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

 

.fig-13_fiber-optic-dp-co-ofdm_constellation_seg-12

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Constellation Diagram after CD and PMD Equalization with no. of fiber segments 12 (960 km)

(Dual Polarization QAM-16 CO-OFDM Fiber Optic Communication Systems)

 

 

fig-14_fiber-optic-dp-co-ofdm-communication-system_pmd-equalization

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 Simulating PMD Equalization for the Optical OFDM System

    (PMD parameter = 1 ps/sqrt(km))

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