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Enhanced wavelength offset tolerance is achieved by using a 25-ps DI's destructive port for the 10-Gb/s downstream DPSK signal demodulation in WDM-PONs. The constructive port output is used for upstream remodulation to simplify ONU structure.
We investigate the use of differential phase-shift keying (DPSK) with a reduced modulation depth (RMD) as the downstream modulation format to enhance the tolerance to both chromatic dispersion and remodulation timing misalignment. Despite the RMD, in each optical network unit the demodulated DPSK signal from the destructive port of the delay-interferometer still maintains a high extinction ratio (ER),...
We propose and experimentally demonstrate a WDM-PON with 10-Gb/s IRZ downstream point-to-point signals, 10-Gb/s DPSK downstream multicast signals, and 10-Gb/s NRZ upstream signals. The multicast control is achieved by simple electronic synchronization adjustment.
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