We compare by simulation the performance of two techniques for generating polarization-multiplexed quadrature phase-shift keying with a high spectral efficiency (SE). The first is based on coherent optical orthogonal frequency-division multiplexing (CO-OFDM). The second, which we call Nyquist wavelength-division multiplexing (N-WDM), is based on the use of optical pulses having an “almost” rectangular spectrum, with bandwidth ideally equal to the Baud-rate. We show that the two techniques have the same sensitivity and SE under idealized assumptions. However, we found that CO-OFDM requires a much larger receiver bandwidth and proportionally faster speed of the analog-to-digital converters. We also tested CO-OFDM and N-WDM over long-haul nonlinear links and found N-WDM to outperform CO-OFDM in this case, too.
Performance limits of Nyquist-WDM and CO-OFDM in high-speed PM-QPSK systems / Bosco G.; Carena A.; Curri V.; Poggiolini P.; Forghieri F.. - In: IEEE PHOTONICS TECHNOLOGY LETTERS. - ISSN 1041-1135. - STAMPA. - 22:15(2010), pp. 1129-1131. [10.1109/LPT.2010.2050581]
|Titolo:||Performance limits of Nyquist-WDM and CO-OFDM in high-speed PM-QPSK systems|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/LPT.2010.2050581|
|Appare nelle tipologie:||1.1 Articolo in rivista|