The Technology and
Architectures Behind Optical Networks
briefly outlines the current architectures of optical networks. It
also serves to filter out from the rest of the discussion directions
that are beyond the scope of this section.
can be divided according to the following taxonomy:
time division multiplexing (OTDM).
Optical code division
distinction between the various network types is based on the
multiplexing scheme: whether it is done in the frequency domain (WDM)
or the time domain, as in optical time division multiplexing (OTDM),
or in OCDM. WDM networks may be further split into:
-- in which both ends of the link have identical equipment to
transmit and receive the channels
Access networks -- in
which one side of the link gets split among different locations
and requires simpler equipment at the customer.
systems--in which the signal is broadcast to multiple endpoints
rather than a single endpoint
More scalable and
complex networks, in the form of wavelength routing networks,
realized by introducing switching nodes to connect multiple
point-to-point WDM links