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

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

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

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

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

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

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

8. DPTC 8 is a 2x2 unitary group.

9. Simulation Results 9

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