title: Experimental study of coexistence of multi-band OFDM-UWB and OFDM-baseband signals in long-reach PONs using directly modulated lasers.
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 5 × 10⁻⁴ 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@0.1 nm. It is experimentally shown that, for the SSMF reach of 100km, 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.
authors: Group of Research on Optical Fibre Telecommunication Systems, Instituto de Telecomunicacoes, DEEC, Instituto Superior Tecnico, Technical University of Lisbon, Av. Rovisco Pais, 1049–001 Lisboa, Portugal. j.morgado@lx.it.pt
authors: José A P
authors: JA
authors: Morgado
authors: Daniel
authors: D
authors: Fonseca
authors: Adolfo V T
authors: AV
authors: Cartaxo