Fiber Optic Transmission Systems

Digital Modulation

The digital bit is the basic unit of digital information. This unit has two values one or zero. The bit represents the electronic equivalent of the circuit being on or off where a zero equals off and a one equals on.  One bit of information is limited to these two values. The digital information is transmitted through the Fiber serially one bit at a time.

A digital pulse train represents the ones and zeros of digital information.  And the pulse train can depict high and low electrical voltage levels or the presence and absence of a voltage.

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