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-Lesly Katherinne Damian De la cruz
-Luis Antonio Inurreta Martinez

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Optical communication is any form of communication that uses light as the transmission medium. An optical communication system consists of a transmitter that encodes the message into an optical signal, a channel that transports the signal to its destination, and a receiver that reproduces the message from the received optical signal.

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An analog signal is a type of signal generated by some type of electromagnetic phenomenon and that is representable by a continuous mathematical function in which its amplitude and period (representing information data) are variable as a function of time.

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An electrical signal is a type of signal generated by some electromagnetic phenomenon. These signals can be analog, if they vary continuously in time, or digital if they vary discretely (with values ​​given as 0 and 1). We will understand by electrical signal an electrical quantity whose intensity value depends on time. Thus, v(t) is a voltage whose amplitude depends on time and i(t) is a current whose intensity depends on time.

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The digital signal is a type of signal generated by some type of electromagnetic phenomenon in which each sign that encodes its content can be analyzed in terms of some magnitudes that represent discrete values, instead of values ​​within a certain range. For example, the light switch can only take two values ​​or states: open or closed, or the same lamp: on or off.

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A signal is a sign, a gesture, an action or something else that has the purpose of informing or warning something, the signals largely replace the written word or language, since these are a little easier to understand.