LIGHT TREES

SEMINAR ON LIGHT TREES : Today, there is a general consensus that in the near future, wide area networks (WAN) (eg, a network of bases around the country) is based on the wavelength
Multiplexing (WDM) optical networks. One of the great advantages of a WDM WAN over other optical technologies, such as Time Division Multiplexed (TDM) optical network is that it allows us to exploit the huge bandwidth of optical fibers (up to 50 terabits of bits per second) to require electronic devices that operate at extremely high speeds. The concept of the tree of light enters a wavelength routed optical networks multiplexing using wavelength division multiplexing (WDM).
According to the topology of the underlying physical network can be divided into three generations:
 first generation, these networks do not use the technology of fiber optics, instead using technology based on copper or microwave. Such as Ethernet.
 Second Generation: These networks use fiber optics for data transmission, but connection is made in the electronic domain. As FDDI.
 third generation of these networks and data transmission and switching is made in the optical domain. For example, WDM.
extended WDM networks using tunable lasers and filters on the access nodes and optical switches / routing nodes electronic level. An access node can transmit signals through different wavelengths, which are coupled to the fiber using wavelength multiplexers. optical signal passes through an optical switch wavelength routing (WRS) can be directed from an output fiber without changing its optoelectronics.


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