Title :
Pilot-Symbols-Aided Carrier-Phase Recovery for 100-G PM-QPSK Digital Coherent Receivers
Author :
Magarini, Maurizio ; Barletta, Luca ; Spalvieri, Arnaldo ; Vacondio, Francesco ; Pfau, Timo ; Pepe, Marianna ; Bertolini, Marco ; Gavioli, Giancarlo
Author_Institution :
Dipt. di Elettron. e Inf., Politec. di Milano, Milan, Italy
fDate :
5/1/2012 12:00:00 AM
Abstract :
A feedforward pilot-symbols-aided carrier-phase recovery scheme is described. The approach relies on pilot symbols that are time-division multiplexed with the transmitted data. In the scheme, an initial coarse estimation of the optical carrier phase, exploiting the knowledge of pilot symbols, is followed by a fine nondata-aided, or blind, estimation. The main advantage of the proposed solution is that of avoiding the phase- ambiguity problem after a cycle slip. The overhead and the impact on the performance of pilot symbols are investigated for long-haul transmission of 100-Gb/s polarization-multiplexed quadrature phase-shift keying wavelength-division-multiplexing signals in different scenarios. For homogeneous transmission, the proposed scheme outperforms blind carrier recovery with differential decoding.
Keywords :
decoding; polarisation; quadrature phase shift keying; radio receivers; time division multiplexing; wavelength division multiplexing; PM-QPSK digital coherent receivers; blind carrier recovery; differential decoding; feedforward pilot-symbols-aided carrier-phase recovery; polarization-multiplexed quadrature phase-shift keying; time-division multiplexing; wavelength-division-multiplexing signals; Bit error rate; Decoding; Optical receivers; Phase estimation; Signal to noise ratio; Wavelength division multiplexing; Coherent detection; optical transmission; pilot symbols; polarization-multiplexed quadrature phase-shift keying;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2187439