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Experimental Study of Coexistence of Multi-Band OFDM-UWB and OFDM-Baseband Signals in Long-Reach PONs Using Directly Modulated Lasers

Morgado, J. ; Fonseca, D. ; Cartaxo, A.

Optics Express Vol. 19, Nº 23, pp. 23601 - 23612, December, 2011.

ISSN (print): 1094-4087
ISSN (online): 1094-4087

Journal Impact Factor: 3,488 (in 2014)

Digital Object Identifier: 10.1364/OE.19.023601

Abstract
Transmission of coexisting Orthogonal Frequency Division Multiplexing (OFDM)-baseband (BB) and multi-band OFDM-ultra-wideband (UWB) signals along long-reach passive optical networks using directly modulated lasers (DML) is experimentally demonstrated.

When optimized modulation indexes are used, bit error ratios not exceeding 5x10^(-4) can be achieved by all (OFDM-BB and three OFDM-UWB sub-bands) signals for a reach of 100 km of standard single-mode fiber (SSMF) and optical signal-to-noise ratios not lower than
25dB@0.1nm. It is experimentally shown that, for the SSMF reach of 100 km, the optimized performance of coexisting OFDM-BB and OFDM-UWB signals is mainly
imposed by the combination of two effects: the SSMF dispersion-induced nonlinear distortion of the OFDM-UWB signals caused by the OFDM-BB and OFDM-UWB signals, and the further degradation of the OFDM-UWB signals with higher frequency, due to the reduced DML bandwidth.