publication . Thesis

Advanced digital signal processing for coherent optical OFDM transmissions

Le, Son Thai;
Open Access English
  • Country: United Kingdom
Abstract
Coherent optical orthogonal frequency division multiplexing (CO-OFDM) has been actively considered as a potential candidate for long-haul transmission and 400 Gb/s to 1 Tb/s Ethernet transport because of its high spectral efficiency, efficient implementation, flexibility and robustness against linear impairments such as chromatic dispersion and polarization mode dispersion. However, due to the long symbol duration and narrow subcarrier spacing, CO-OFDM systems are sensitive to laser phase noise and fibre nonlinearity induced penalties. As a result, the development of CO-OFDM transmission technology crucially relies on efficient techniques to compensate for the l...
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3.11 Root-mean-square-error (RMSE) of CPE as a function of SNR for DDF PNE techniques employing J1(j)), J2(j) and J3(j) for 16QAM COOFDM transmission with N = 100 subcarriers. . . . . . . . . . . . . . .

3.12 Required SNRs for a RMSE of 0.1 rad as a function of number of subcarriers (N) for DDF PNE techniques employing J1(j)), J2(j) and J3(j) for 16QAM CO-OFDM transmission. . . . . . . . . . . . . . . . . . . . . .

3.13 a) BER performances of PNE techniques, including PA-aided with 16 pilots (blue), BPS with 16 test phases (brown) and DDF blind PNE with different cost functions (red- J1(j), green- J2(j), pink- J3(j)) with feedback loop (solid) and digital phase tracking (open) for 16QAM, the symbol duration linewidth product is 5 10 3; (b) BER performance of the same PNE (only showing digital phase tracking) for 64QAM, the symbol duration linewidth product is 2 10 3. . . . . . . . . . . . . . . . . . . .

3.14 Constellation diagrams for 16QAM at a SNR of 23 dB, before PNE (a), after PNE using PA-aided technique with 16 pilots (b), after PNE with DDF blind PNE technique with digital phase tracking and J1(j) (c), after PNE using BPS with 16 test phases (d), after PNE DDF blind PNE technique with digital phase tracking and J2(j) and J3(j) (e, f). . . . . . . . . . . .

3.15 The SNR penalty at a BER of 10 3 as a function of nTS for PA-aided, BPS and DDF blind PNE with different cost functions for 16QAM transmission with 200 subcarriers; (b) similar result for 16QAM and 100 subcarriers; (c) similar result for 64QAM at a BER of 10 2 and 200 subcarriers; (d) SNR penalty as a function of N at a BER of 10 2 for 64QAM and TS of 10 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.16 Estimating the MPB with a bin width of using the scanning algorithm with overlapping bins and small scaning step. The histogram with small bin width is also shown. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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