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Coding Design for Fiber -Optic PolDM Systems

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.

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Coding Design for Fiber -Optic PolDM Systems

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

  2. Introduction Fiber-Optic Communication Cable TV Signal Telephone Signal On-off keying: spectral efficiency is only 0.8 b/s/Hz! Internet Signal

  3. Im Im Im Re Re Re To Increase Spectral Efficiency • Noncoherent Detection to Coherent Detection • Polarization-Division Multiplexing (PolDM)

  4. PolDM Systems in Literatures RZ-8PSK RZ-DQPSK CSRZ-DPSK RZ-DPSK

  5. Impairments • Nonlinear impairments: Kerr nonlinearity • The higher the intensity, the greater the nonlinearity is • Will induce nonlinear phase noise (NLPN) • Linear impairments: Polarization mode dispersion (PMD) dominates!

  6. PMD Fast axis Slow axis Time varying on the scale of milliseconds! Current compensators are complicated and expensive to build.

  7. DPTC without PMD compensation H A unitary matrix! An analogue to wireless MIMO system Wireless System Differential Space-Time Coding (DSTC) PolDM System Differential Polarization-Time Coding (DPTC)

  8. DPTC is a 2x2 unitary group.

  9. Simulation Results

  10. Simulation Results Coherent PolDM-QPSK DPTC 64 points Optical PMDC Standard receiver Digital MLSE Electronic equalizer

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