Optical Engineering

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

By Byrav Ramamurthy

Lo, soul! seest thou now not God's goal from the 1st? The earth to be spann'd, hooked up via net-work From Passage to India! Walt Whitman, "Leaves of Grass", 1900. the net is turning out to be at a major fee this present day. New companies, similar to telephony and multimedia, are being further to the natural data-delivery framework of the day before today. Such excessive calls for on potential could lead on to a "bandwidth-crunch" on the center wide-area community leading to degra­ dation of carrier caliber. thankfully, technological suggestions have emerged that can offer reduction to the end-user to beat the In­ ternet's recognized hold up and bandwidth boundaries. on the actual layer, a massive overhaul of present networks has been envisaged from digital media (such as twisted-pair and cable) to optical fibers - within the extensive sector, within the metropolitan region, or even within the neighborhood quarter set­ tings. to be able to make the most the tremendous bandwidth power of the optical fiber, fascinating multiplexing strategies were built through the years. Wavelength department multiplexing (WDM) is the sort of promising tech­ nique during which a number of channels are operated alongside a unmarried fiber si­ multaneously, each one on a unique wavelength. those channels should be independently modulated to deal with assorted bit premiums and information codecs, if that is so wanted. hence, WDM carves up the massive bandwidth of an optical fiber into channels whose bandwidths (1-10 Gbps) are compati­ ble with height digital processing speed.

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