US PATENT SUBCLASS 359 / 124
.~.~ Wavelength division/frequency division (includes scattering, e.g., Raman, Brillouin, etc.)

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

109  DF  OPTICAL COMMUNICATION {13}
115  DF  .~ Multiplex {7}
124.~.~ Wavelength division/frequency division (includes scattering, e.g., Raman, Brillouin, etc.) {4}
125  DF  .~.~.~> Subscriber system {1}
127  DF  .~.~.~> By optical coupling {4}
132  DF  .~.~.~> Single source, electrically controlled
133  DF  .~.~.~> Different sources {1}

DEFINITION

Classification: 359/124

Wavelength division/frequency division (includes scattering, e.g., Raman, Brillouin, etc.):

(under subclass 115) Subject matter wherein (1) two or more information optical signals simultaneously present on a common optical waveguide are differentiated by optical wavelength or (2) the frequency spectrum of the optical transmission medium is divided into segments and respective information channels are transmitted in differing segments.

(1) Note. Waveguide division multiplexing (fiber optics) are identified as WDM.

(2) Note. Differing segments need not be associated on a one-to-one basis with the information channels.

(3) Note. This subject matter may include waveguide with an input/output coupler as a subcombination thereof (see Search Class Notes for Class 385).

(4) Note. Stimulated Raman effect is the amplification, built up strongly and generally exhibiting the characteristic of stimulated emission of the small portion of light that is scattered in random directions when a monochromatic light beam of high intensity is transmitted through matter. This small portion of light is equal to the frequencies of the matter.

(5) Note. A Brillouin type nonlinear opitcal device spontaneously scatters light in a medium by its interaction with sound waves passing through the medium. If this includes frequency shifted radiation with optical multiplexing, it would go into this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

114, for optical transceiver wavelength duplex wherein two optical beams having different wavelengths are transmitted in opposite directions in the same medium. 123, for time and frequency division multi-plex.

149, for photophone wherein an audio signal is directly modulated onto a light beam.

327, for Raman type frequency translators, per se.

SEE OR SEARCH CLASS

370, Multiplex Communications, appropriate subclasses, particularly

281, and 295 for frequency division in wireless or wired nonoptical duplex systems, respectively, and subclasses 343+ and 480+ for frequency division in wireless or wired nonoptical multiplex communications systems, respectively.

385, Optical Waveguides,

31+, for the combination of a waveguide and an input/output coupler not included in an optical communications system.