DWDM Pocket Guide

DWDM Pocket Guide pdf

With today’s seemingly limitless demand for transmission
capacity, service providers often cope with extreme fiber usage
and exhaust across significant portions of their networks.
Anenormousamount ofbandwidth capacity is thereforeneeded
to provide the services required by customers. The expansion
of existing links calls for simple, cost effective solutions that
cause minimum disruption to working systems.
The telecommunications industryhas so far met these needs
by using dense wavelength division multiplexing (DWDM)
systems. In allowing both new and existing fiber optic links
to carry several channels simultaneously, DWDM can optimize
the use of current facilities whilst offering greater capacities
for the future.
Networkoperators are also faced with the challenge ofhaving
to integrate multiple technologies for the transmission of
diverse services in a physical layer infrastructure.

Voice transmission, e-mail, video and multimedia data are
just some examples of services which can be simultaneously
transmitted in DWDM systems, regardless of their transmission
formats which include synchronous optical network(SONET),
synchronous digital hierarchy (SDH), asynchronous transfer
mode (ATM), internet protocol (IP), packet over SONET/SDH
(PoS) or gigabit ethernet (GigE).
Unlike previous systems however, the planning, installation,
and maintenance ofDWDM networksdemands thatmuch
closer attention be paid to a number of performance
limiting parameters.