Optical phase remodulation for 10-Gb/s WDM-PON with enhanced tolerance to Rayleigh noise

A novel phase remodulation scheme for 10-Gb/s WDM-PON is proposed and demonstrated. Downstream DPSK signal with a reduced modulation depth facilitates upstream phase remodulation and Rayleigh noise suppression. High extinction-ratio is attained in downstream/upstream demodulation.