Hi
i would like to add that there are three types of PON system, namely B-PON, G-PON and GE-PON. the GE-PON system has been developed and implemented it as a cost-effective optical access system with a high throughput. With a PON system, optical fibers and transmission devices are shared by multiple customers in order to provide FTTH services at low cost. This means that even when accommodating several customers at once, each customer can be provided with high-speed data transmission at a maximum data rate of 100 Mbit/s.
Once fibers are deployed in the field, it would be a critical issue how to migrate to WDM-PON because current Time Division Multiplexing (TDM)- based PON solutions cannot exploit the huge bandwidth of the optical fibers and therefore will have difficulties in meeting ever-increasing demands for higher bandwidth by future network applications.
I hope this will be helpful.
Thanks