Over the next few years, the EPON roadmap includes
Passive Optical Networks (PONs) 185
migration to a target data rate of 10 Gbps. With 10 Gbps Ethernet systems already
standardized by the IEEE community and advanced research being carried out for 40
Gbps and 100 Gbps Ethernet solutions, increasing the data rate while maintaining the
existing wavelength channel count seems to be a pragmatic and attractive solution.
During the development of a 10 Gbps EPON [18], the key challenge will be to redefine
the cost envelope for EPON system components (both electrical and optical), so that
10 Gbps EPON systems can enjoy the same economies of scale and price reduction
trends that today??™s 1 Gbps EPON systems have enjoyed.
Mixed Upgrade Scenarios
The most interesting upgrade scenarios include both WDM overlay and raw datarate
upgrade, resulting in a significantly increased amount of subscriber accessible
bandwidth, while using the best from both system capacity upgrade scenarios. We will
briefly discuss two mixed upgrade scenarios here:
?– A WDM scenario similar to the one employed in 10GBASE-LX4 systems, where
four 2.5 Gbps transmission channels are multiplexed into a single transmission fiber,
carrying a total of 10 Gbps of subscriber data and delivering four data streams
to each ONU.
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