October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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received downstream signal strength is reduced by the optical coupler at the RT
and local transmitter power is usually high, NEXT puts a stringent requirement
on reflection controls [7]. Furthermore, if the ONU and OLT wavelengths
happen to be very close, NEXT will produce coherent cross talk, which is even
more detrimental.
2.3.4.3 Time Divi sion Duplex
In the time division duplex approach, the OLT and ONU take turns to use the
fiber in a ping-pong fashion for upstream and downstream transmissions. Similar
to the one-fiber single-wavelength full duplex approach, directional couplers are
used at OLT and ONUs to separate upstream and downstream optical ...
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