US PATENT SUBCLASS 359 / 182
.~.~.~ Frequency modulation

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

109  DF  OPTICAL COMMUNICATION {13}
180  DF  .~ Transmitter {3}
181  DF  .~.~ With particular modulation {3}
182.~.~.~ Frequency modulation

DEFINITION

Classification: 359/182

Frequency modulation:

(under subclass 181) Subject matter wherein the instantaneous amplitude of the information signal (i.e., modulating signal) modulates a carrier so that its instantaneous frequency differs from the carrier frequency by an amount proportional to the information signal amplitude.

(1) Note. Combinations of phase and frequency modulation are commonly referred to as frequency modulation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

183, for an optical transmitter using phase modulation.