A Novel Multi-Ary Polsk Modulation for Downstream Signal in Wavelength Reusing Wdm Pon

Abstract

A novel modulation, i.e. multi-ary polarization shift keying (PolSK) modulation is proposed for WDM PONs to achieve colorless ONUs. The downstream signal applies the proposed multi-ary PolSK to eliminate the induced crosstalk to the remodulated amplitude shift keying (ASK) upstream signal. Different from traditional PolSK, there are more than two polarization states in the proposed multi-ary PolSK, so it provides higher bit rates and spectra efficiency. Four-ary and six-ary PolSK are demonstrated and evaluated by simulation. The results show the proposed multi-ary PolSK supports high-speed downstream signal in future PONs with very low crosstalk induced to the remodulated upstream signal.

Keywords: PON, upstream remodulation, Multi-ary PolSK