US PATENT SUBCLASS 359 / 279
.~.~.~.~ Phase modulation

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

237  DF  OPTICAL MODULATOR {3}
238  DF  .~ Light wave temporal modulation (e.g., frequency, amplitude, etc.) {3}
240  DF  .~.~ Changing bulk optical parameter {5}
245  DF  .~.~.~ Electro-optic {11}
279.~.~.~.~ Phase modulation

DEFINITION

Classification: 359/279

Phase modulation:

(under subclass 245) Subject matter wherein the normal zero phase of a constant amplitude optical wave (i.e., carrier wave) is shifted by an angle proportional to the amplitude of the applied signal (i.e., modulating signal).

(1) Note. A sinusoidal signal of zero phase will have a zero amplitude at the intersection of the x-y axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

278, for electro-optic frequency modulation.

287, for acousto-optic frequency modulation.