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Multiplexer Knowledge
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Multiplexers can be used to connect PBX, Hot line and other devices of network from central site to user site through fiber optical cable.
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Multiplexer Knowledge
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What is Time Division Multiplexing?
Time division multiplexing is a technique where several optical signals are combined, transmitted together, and separated again based on different arrival times. In an optical fiber communication system, interleaving pulse trains can carry different data channels in a single fiber.
The use of multiple channels allows increased overall data transmission capacities without increasing the data rates of the single channels or transmission of data of different users simultaneously. However, the time slot per bit must be reduced. Even if the bandwidth of the data modulator is limited, this can be done by using a train of ultrashort pulses (rather than a continuous optical wave) as the input of the modulator.
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PDH 1+1 with E+E Fiber Optical Multiplexer
Special requirements of data transmitters for optical time division multiplexing are short pulse duration and a low timing jitter. Also, the extinction ratio should be high, i.e. each combined channel should exhibit a very low power level between the bit slots, because such a background could otherwise interfere with other channels.
An alternative to time division multiplexing is wavelength division multiplexing, where the channels are distinguished by wavelength rather than by arrival time.
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