Abstract
This paper clarifies the scalability of the hitless wavelength-tuning (-tuning) sequence for dynamic wavelength allocation (DWA) on a -tunable wavelength-division-multiplexing/time-division-multiplexing passive optical network (WDM/TDM-PON). The -tuning that induces no data-frame loss, i.e., hitless -tuning, is essential in DWA. We derive requirements to prevent two types of upstream data-frame loss that the -tuning causes. To clarify the scalability of the hitless -tuning sequence against system parameters, we theoretically analyze the maximum input data rate to the optical network units (ONUs) to achieve -tuning without upstream data-frame loss while varying values for buffer size and -tuning time of the transceivers in ONUs and the DWA cycle. Then, using media access control boards that we developed for symmetric 40 Gbit/s -tunable WDM/TDM-PONs, we demonstrate hitless -tuning and confirm the validity of the theoretical analysis.
© 2015 Optical Society of America
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