Analysis of dispersion-enhanced phase noise in CO-OFDM systems with RF-pilot phase compensation

作者：Zhuge Qunbi^*; Morsy Osman Mohamed; Plant David V

来源：Optics Express, 2011, 19(24): 24030-24036.

DOI：10.1364/OE.19.024030

We show that dispersion-enhanced phase noise (DEPN) induces performance degradations in both conventional CO-OFDM systems and reduced-guard-interval (RGI) CO-OFDM systems employing RF-pilot phase compensation. After analytically studying DEPN, we show that DEPN causes a 2 to 6 dB optical signal-to-noise ratio (OSNR) penalty at transmission distances of 3200 km and 1600 km for 28 and 56 Gbaud QPSK systems, respectively, using lasers with 2 MHz linewidths. At such distances, DEPN reduces the linewidth tolerance at 1 dB OSNR penalty to 250-500 kHz while in the back-to-back case the tolerance is 1-3 MHz for both systems. When fiber nonlinearity is included, we observe similar performance degradations.

• 出版日期2011-11-21