US PATENT SUBCLASS 359 / 189
.~ Receiver

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

109  DF  OPTICAL COMMUNICATION {13}
189.~ Receiver {5}
190  DF  .~.~> Homodyne
191  DF  .~.~> Heterodyne {1}
193  DF  .~.~> With optical element (e.g., lens, mirror, etc.)
194  DF  .~.~> Automatic gain control
195  DF  .~.~> With optical waveguide

DEFINITION

Classification: 359/189

Receiver:

(under subclass 109) Subject matter wherein the information or modulating signal which has been transmitted may be derived from the received modulated light wave signals and converted into signals corresponding to the information transmitted.

(1) Note. This classification is restricted to those devices peculiar to light wave communication with information modulated thereon not merely a nonmodulated light control signal to control or activate an electrical amplifier in Class 330, subclass 59.

(2) Note. An optical receiver contains an optical demodulator together with other elements required to communicate information from one location to another via an optical beam.

SEE OR SEARCH THIS CLASS, SUBCLASS:

152+, for optical transceivers in an optical communication system.

154+, for an optical transmitter and receiver system in an optical communication system.

174+, for an optical repeater communication system. 180+, for an optical transmitter in an optical communcation system.

SEE OR SEARCH CLASS

250, Radiant Energy,

206+, for photocell controlled circuits of general utility, and subclasses 336.1+ for invisible radiant energy responsive electric signalling.

330, Amplifiers,

59, for electrical amplifiers combined with a nonmodulated light controlled or activated device that is not part of the amplifying device.

356, Optics: Measuring and Testing, appropriate subclasses for the measuring or testing of an optical property.