Coding Design for Fiber -Optic PolDM Systems

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Coding Design for Coding Design for Fiber-Optic PolDM Fiber-Optic PolDM Systems Systems Chunpo Pan Supervisor: Prof. Frank Kschischang 1

description

Coding Design for Fiber -Optic PolDM Systems. Chunpo Pan Supervisor: Prof. Frank Kschischang. Introduction. Fiber -Optic Communication. Cable TV Signal. Telephone Signal. On-off keying: spectral efficiency is only 0.8 b/s/Hz!. Internet Signal. Im. Im. Im. Re. Re. Re. - PowerPoint PPT Presentation

Transcript of Coding Design for Fiber -Optic PolDM Systems

Page 1: Coding Design for  Fiber -Optic  PolDM  Systems

Coding Design for Fiber-Coding Design for Fiber-Optic PolDM SystemsOptic PolDM Systems

Chunpo PanSupervisor: Prof. Frank Kschischang

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Page 2: Coding Design for  Fiber -Optic  PolDM  Systems

IntroductionIntroduction

Telephone Signal

Internet Signal

Cable TV Signal

On-off keying: spectral efficiency is only 0.8 b/s/Hz!

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To Increase Spectral To Increase Spectral EfficiencyEfficiencyNoncoherent Detection to

Coherent Detection

Polarization-Division Multiplexing (PolDM)

Im

Re

Im

Re

Im

Re

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PolDM Systems in PolDM Systems in LiteraturesLiteratures

RZ-DPSK

CSRZ-DPSK

RZ-DQPSK

RZ-8PSK

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ImpairmentsImpairmentsNonlinear impairments:Kerr nonlinearityo The higher the intensity, the greater the nonlinearity

is

o Will induce nonlinear phase noise (NLPN)

Linear impairments:Polarization mode dispersion (PMD) dominates!

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PMDPMD

Slow axis

Fast axis

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Time varying on the scale of milliseconds

!Current compensators are

complicated and expensive to build.

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DPTC without PMD DPTC without PMD compensationcompensation

HA unitary matrix!

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An analogue to wireless MIMO system

Wireless SystemDifferential Space-Time Coding (DSTC)

PolDM SystemDifferential Polarization-Time Coding (DPTC)

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DPTCDPTC

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is a 2x2 unitary group.

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Simulation ResultsSimulation Results

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Simulation ResultsSimulation Results

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Standard receiver

DPTC 64

pointsElectroni

c equalizer

Optical PMDC

Coherent PolDM-QPSK

Digital MLSE