Design of Optical WDM Networks: LAN, MAN and WAN by Byrav Ramamurthy

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By Byrav Ramamurthy

Lo, soul! seest thou no longer God's function from the 1st? The earth to be spann'd, attached through net-work From Passage to India! Walt Whitman, "Leaves of Grass", 1900. the web is transforming into at an immense price this present day. New prone, similar to telephony and multimedia, are being extra to the natural data-delivery framework of the day past. Such excessive calls for on ability may lead to a "bandwidth-crunch" on the middle wide-area community leading to degra­ dation of provider caliber. thankfully, technological concepts have emerged which may offer aid to the end-user to beat the In­ ternet's recognized hold up and bandwidth obstacles. on the actual layer, an enormous overhaul of present networks has been envisaged from digital media (such as twisted-pair and cable) to optical fibers - within the vast region, within the metropolitan quarter, or even within the neighborhood sector set­ tings. on the way to make the most the vast bandwidth strength of the optical fiber, attention-grabbing multiplexing thoughts were built through the years. Wavelength department multiplexing (WDM) is this sort of promising tech­ nique within which a number of channels are operated alongside a unmarried fiber si­ multaneously, each one on a special wavelength. those channels may be independently modulated to deal with numerous bit premiums and information codecs, if that is so wanted. hence, WDM carves up the large bandwidth of an optical fiber into channels whose bandwidths (1-10 Gbps) are compati­ ble with height digital processing speed.

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