Pulse-amplitude modulation, acronym PAM, is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses.
Example: A two bit modulator (4-PAM) will take two bits at a time and will map the signal amplitude to one of four possible levels, for example −3 Volts, −1 Volt, 1 Volt, and 3 Volts.
Demodulation is performed by detecting the amplitude level of the carrier at every symbol period.
Pulse: A current or voltage which changes abruptly from one value to another and back to the original value in a finite length of time.
Pulse-code Modulation (PCM): A technique in which an analog signal, such as a voice, is converted into a digital signal by sampling the signal's amplitude and expressing the different amplitudes as a binary number.
Pulse Dispersion: The dispersion of an optical signal as it propagates through an optical fiber.
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