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You can get the details from http://www.efiber.net and http://www.fiberalliance.net.
Latest information on DWDM commercial products can be obtained from http://www.cisco.com, http://www.nortelnetworks.com, http://www.ericsson.com, and http://www.siemens.de.
A Raman amplifier is a device that amplifies the optical signals directly. Hence, there is no need to convert the optical signal to electrical signal, amplify it, and reconvert it into optical signal.
Presently C band and L band are used in optical fiber, mainly because of the availability of optical components in these bands.
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