A cost-saving scheme of centralized-light-source WDM PON utilizing inverse-duobinary-RZ downstream and OFDM upstream

A novel structure of centralized-light-source WDM-PON utilizing inverse-duobinary-RZ downstream and OFDM upstream is proposed. It has realized colorless detection of downstream, and in the same time source-free modulation for upstream modulation, which largely cut down cost of ONUs. Meanwhile, a 50-km-reach WDM-PON experiment with 10 Gb/s inverse-duobinary-RZ downstream and 10 Gb/s OFDM upstream is demonstrated here.