Hey, just wanted to note that GPON and DWDM are very different things. GPON does use some basic WDM to combine upstream and downstream (and some times a third for CATV) wavelengths, but that is not even close to DWDM levels.
GPON (same for XGPON) are about the method of using a single fiber uplink and a series of passive optical splitters to connect multiple optical terminals.
As for the 10G PON - there also symetric 10G PON standarts, there is not sinble one standard, but a bunch and different HW venfors are betting on different ones.
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