Sub-Nyquist field trial using time frequency packed DP-QPSK super-channel within fixed ITU-T grid

Potì, L.; Meloni, G.; Berrettini, G.; Fresi, Francesco; Foggi, Tommaso; Secondini, Marco; Giorgi, L.; Cavaliere, Fabio; Hackett, S.; Petronio, A.; Nibbs, P.; Forgan, R.; Leong, Andrew; Masciulli, R.; Pfander, C.

doi:10.1364/oe.23.016196

Cited by 8 publications

(1 citation statement)

References 24 publications

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“…Although this result should set a limit for BER measurements at about 10 −6 , it is known that LDPC error floors entails bit errors in bursts, preventing the reliable measurement of such low BER. However, the design of LDPC codes with low error floors falls outside the scope of our work and we conjecture, based on extensive computer simulations and measurement campaigns [34], that the employed codes do not present floors for packet error rate higher than 10 −7 . This sets a limit for the minimum measurable BER at about 10 −7 , and for reliable BER measurements at about 10 −6 .…”

Section: Experimental Demonstrationmentioning

confidence: 99%

Optical Time–Frequency Packing: Principles, Design, Implementation, and Experimental Demonstration

Secondini

Foggi²,

Fresi

et al. 2015

J. Lightwave Technol.

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Time-frequency packing (TFP) transmission provides the highest achievable spectral efficiency with a constrained symbol alphabet and detector complexity. In this work, the application of the TFP technique to fiber-optic systems is investigated and experimentally demonstrated. The main theoretical aspects, design guidelines, and implementation issues are discussed, focusing on those aspects which are peculiar to TFP systems. In particular, adaptive compensation of propagation impairments, matched filtering, and maximum a posteriori probability detection are obtained by a combination of a butterfly equalizer and four 8-state parallel Bahl-Cocke-Jelinek-Raviv (BCJR) detectors. A novel algorithm that ensures adaptive equalization, channel estimation, and a proper distribution of tasks between the equalizer and BCJR detectors is proposed. A set of irregular low-density parity-check codes with different rates is designed to operate at low error rates and approach the spectral efficiency limit achievable by TFP at different signal-to-noise ratios. An experimental demonstration of the designed system is finally provided with five dual-polarization QPSK-modulated optical carriers, densely packed in a 100 GHz bandwidth, employing a recirculating loop to test the performance of the system at different transmission distances.Index Terms-Time-frequency packing, faster-than-Nyquist signaling, information theory, optical fiber communication, coherent optical systems.

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Section: Experimental Demonstrationmentioning

confidence: 99%