Performance analysis of an ultra-wideband decoder for spectrally encoded ECDMA on passive optical network

A new method of electronic code division multiple access (ECDMA) for passive optical network (PON) applications is investigated. An ultra-wideband (UWB) decoder is proposed to make available spectral amplitude-coding (SAC), as an alternative to direct sequence (DS). Code modulation waveforms implemented in multi-Gchip/s transversal filters allow the evaluation of impulsive responses of the PON structure. Impairments that impact the transmission of spectral users and thus the correct decoding of SAC signals are analyzed. The signal-to-interference ratio (SIR) is derived assuming that simultaneous users are structured as shot noise pulse-trains. It is seen that the scheme improves interference rejection over previous proposals. Photonic system simulation shows the viability of the electronic processing.