Electro – optic – Magneto Optic and Acousto – Optic effects (1)
Coding Design for Fiber-Optic PolDM Systems Chunpo Pan Supervisor: Prof. Frank Kschischang 1.
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Transcript of Coding Design for Fiber-Optic PolDM Systems Chunpo Pan Supervisor: Prof. Frank Kschischang 1.
Coding Design for Fiber-Coding Design for Fiber-Optic PolDM SystemsOptic PolDM Systems
Chunpo PanSupervisor: Prof. Frank Kschischang
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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 iso 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.
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)
DPTCDPTC
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is a 2x2 unitary group.
Simulation ResultsSimulation Results
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Simulation ResultsSimulation Results
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Standard receiver
DPTC 64
points Electronic
equalizer
Optical PMDC
Coherent PolDM-QPSK
Digital MLSE