
transceivers, the wavelengths are designated in accordance with industry stand-
ards, namely, 1310 nm for the upstream and 1490 nm for the downstream
wavelengths. For triplexer transceivers, the 1550 nm wavelength is allocated
for analog broadcast video overlay in the downstream direction (Chap. 2). It is
also possible that digital video signals are carried on the downstream 1490-nm
wavelength using video over IP technologies.
For rapid adoption of FTTH, it is important to reduce the cost of optical
transceivers. In particular, the overall PON system cost is weighted more toward
the ONU, as the OLT cost is shared among the number of FTTH users. So the ...