Unit 3 Wdm Pdf The document discusses wavelength division multiplexing (wdm) transmission basics. it describes: 1) options for increasing bandwidth including sdm, tdm, and wdm. 2) varieties of wdm including conventional wdm with 2 wavelengths, dwdm with 100ghz spacing in the c band, and cwdm with 3000ghz spacing. Capacity upgrade of existing fiber networks (without adding fibers) transparency: each optical channel can carry any transmission format (different asynchronous bit rates, analog or digital) scalability– buy and install equipment for additional demand as needed wavelength routing and switching: wavelength is used as another dimension to time and space wavelength division multiplexing each wavelength is like a separate channel (fiber) tdm vs wdm ex: sonet wavelength division multiplexing passive active devices are needed to combine, distribute, isolate and amplify optical power at different wavelengths wdm, cwdm and dwdm wdm technology uses multiple wavelengths to transmit information over a single fiber coarse wdm (cwdm) has wider channel spacing (20 nm) – low cost dense wdm (dwdm) has dense channel spacing (0.8 nm) which allows simultaneous transmission of 16 wavelengths – high capacity wdm and dwdm first wdm networks used just two wavelengths, 1310 nm and 1550 nm today's dwdm systems utilize 16, 32,64,128 or more wavelengths in the 1550 nm window each of these wavelength provide an independent channel (ex: each may transmit 10 gb s digital or scma analog) the range of standardized channel grids includes 50, 100, 200 and 1000 ghz spacing wavelength spacing practically depends on: laser linewidth optical filter bandwidth itu t standard transmission dwdm windows principles of dwdm bw of a modulated laser: 10 50 mhz 0.001 nm typical guard band: 0.4 – 1.6 nm 80 nm or 14 thz @1300 nm band 120 nm or 15 thz @ 1550 nm discrete wavelengths form individual channels that can be modulated, routed and switched individually these operations require variety of passive and active devices ex. 10.1 nortel optera 640 system 64 wavelengths each carrying 10 gb s dwdm limitations theoretically large number of channels can be packed in a fiber for physical realization of dwdm networks we need precise wavelength selective devices optical amplifiers are imperative to provide long transmission distances without repeaters part ii: wdm devices key components for wdm passive optical components wavelength selective splitters wavelength selective couplers active optical components tunable optical filter tunable source optical amplifier add drop multiplexer and de multiplexer photo detector responsivity photo detectors are sensitive over wide spectrum (600 nm).
Wdm Concept And Components 1 Pdf Wavelength Division Multiplexing Wdm basics free download as powerpoint presentation (.ppt), pdf file (.pdf), text file (.txt) or view presentation slides online. the document is a training course on wdm basics provided by huawei technologies. The implementation of wdm network requires a variety of passive and or active devices to combine, distribute, isolate, and amplify optical power at different wavelength. Enhanced document preview: wdm basics topics fiber principles optical transmission system wavelength division multiplexing (wdm) wavelength channel spacing wdm optical components devices. Wdm reduces fiber plant requirements by allowing multiple connections over one fiber. download as a pptx, pdf or view online for free.
Updated Wdm Principle Issue1 24 Pdf Enhanced document preview: wdm basics topics fiber principles optical transmission system wavelength division multiplexing (wdm) wavelength channel spacing wdm optical components devices. Wdm reduces fiber plant requirements by allowing multiple connections over one fiber. download as a pptx, pdf or view online for free. In wdm, several high bandwidth signals travel on the same fiber, in the same time, each using a different light wavelength. dwdm uses the same principles as a wdm, but with high density of light wavelength alocation. Download presentation by click this link. while downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. dense wavelength division multiplexing. theory. what we will cover. Wdm and dwdm slide free download as powerpoint presentation (.ppt .pptx), pdf file (.pdf), text file (.txt) or view presentation slides online. The document outlines wavelength division multiplexing (wdm) concepts and components, including principles of wdm operation, types of wdm, and important components like optical add drop multiplexers, isolators, and circulators.
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