The basic structure of DWDM systems.In the original, classic WDM systems often use a light 1.33 and 1.55 μm wavelength instead of independent political channels and glass fibers, the same path. This makes the channel could not be added, that is in terms of the wavelength of light so much. Because the light in each channel, there are many different wave lengths. Will have the value of signal attenuation. Make the maximum distance that can send data. It is not the same with the results in the system for long distance communications repeater station requires overboard (repeater) separately for each wave length has increased costs and hassles system. To solve the problem by selecting the channel to have a wavelength of light by light, in nearby, is in the range of the light wavelength window, one.If you are looking to the overall infrastructure of the communication system with the fiber glass is a summary, it may be the major blog DWDM therefore figure 1, which is a one-way communication system (simplex), starting from a Transmitter which serves the electrical signal light change data is then delivered into the glass fiber Transmitter at.The previous track will send the light 1 is one wavelength channel data, light one channel may be electronic, multiplex has a high bit rate, such as 2.5 Gb/s and 10 Gb/s light then all channels with different wavelengths are combined, a process that way.Optical Multiplexer (Mux). to send to the destination with a single glass fiber information travelling in between attenuation path is light intensity values are weaker. Need Optical Amplifier repeater station that acts as a signal amplifier channel light at the same time, there is enough light intensity and size, will continue to travel the distance.
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