October 2007
Intermediate to advanced
368 pages
10h 55m
English
Content preview from Passive Optical Networks
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the spectral power difference between the ‘‘0’’ and ‘‘1’’ levels of the downstream
signal, and improving the upstream performance.
Wavelength reuse schemes proposed very recently have revisited the use of
subcarriers to distinguish between downstream and upstream signals at the
ONU, which was first proposed in 1994. In [93–95], data in ASK format is
subcarrier multiplexed onto downstream carriers at the CO. At each ONU, a
passive optical notch filter is used to filter out the downstream carrier for base-
band remodulation with upstream data. The exact same passive optical notch
filter can be used at all ONUs if it is implemented using a multichannel ...
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