Class   398	OPTICAL COMMUNICATIONS
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1

FAULT RECOVERY

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. (1 indent ) Bypass inoperative element

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.. (2 indent ) In a ring or loop

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... (3 indent ) Using a secondary ring or loop

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.. (2 indent ) Spare channel or standby optical fiber

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. (1 indent ) In a repeater system

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. (1 indent ) WDM

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. (1 indent ) TDM

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DIAGNOSTIC TESTING

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. (1 indent ) Fault location

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.. (2 indent ) Repeater

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.. (2 indent ) Switch

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.. (2 indent ) Fiber or waveguide

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.. (2 indent ) WDM

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.. (2 indent ) Stop transmission or reduce power

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. (1 indent ) Test signal

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. (1 indent ) Fault detection

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.. (2 indent ) Repeater

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.. (2 indent ) Switch

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.. (2 indent ) Optical fiber

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... (3 indent ) Determined by reflection from break in fiber

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.. (2 indent ) Transceiver

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.. (2 indent ) Transmitter

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.. (2 indent ) Receiver

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. (1 indent ) Determination of communication parameter

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.. (2 indent ) Signal to noise ratio

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.. (2 indent ) Bit error rate

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.. (2 indent ) Fiber characteristic

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... (3 indent ) Dispersion

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.. (2 indent ) Using supervisory signal

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... (3 indent ) Different wavelengths for diagnostic and communication

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... (3 indent ) Pilot signal

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... (3 indent ) Monitoring

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.. (2 indent ) WDM system

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.. (2 indent ) TDM system

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.. (2 indent ) Collision detection

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.. (2 indent ) Amplifier or repeater operation

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.. (2 indent ) Power

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INTERFERENCE SIGNAL TRANSMISSION OR ELIMINATION (E.G., JAMMING OR ANTIJAMMING)

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EAVESDROPPING

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DUPLEX

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. (1 indent ) Wavelength division

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MULTIPLEX

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. (1 indent ) Mode

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. (1 indent ) Optical switching

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.. (2 indent ) Hybrid

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... (3 indent ) Time and wavelength

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.. (2 indent ) Wavelength

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... (3 indent ) Router

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... (3 indent ) Crossconnect

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... (3 indent ) Including photonic packet switching

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.. (2 indent ) Time

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... (3 indent ) Including delay

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... (3 indent ) Including photonic packet switching

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.. (2 indent ) space

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... (3 indent ) Crossconnect

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... (3 indent ) Path finding or path routing

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. (1 indent ) Optical local area network (LAN)

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.. (2 indent ) Ring or loop

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.. (2 indent ) Bus

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.. (2 indent ) Active star

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... (3 indent ) Repeater

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.. (2 indent ) Passive star

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... (3 indent ) Repeater

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. (1 indent ) Polarization

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. (1 indent ) Broadcast and distribution system

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.. (2 indent ) Bidirectional

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.. (2 indent ) WDM

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... (3 indent ) With variable frequency channel assignment

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... (3 indent ) Hub or central office

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.... (4 indent ) Including subscribers

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....• (5 indent ) Bidirectional

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... (3 indent ) Bus

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. (1 indent ) Hybrid

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.. (2 indent ) Time and wavelength division

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. (1 indent ) Subcarrier multiplexing

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. (1 indent ) Code division multiplexing

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.. (2 indent ) Multiple Access (e.g., CDMA)

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. (1 indent ) Wavelength division or frequency division (e.g., Raman, Brillouin, etc.)

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.. (2 indent ) Soliton

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.. (2 indent ) Dispersion compensation

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.. (2 indent ) By optical coupling

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... (3 indent ) Add or drop

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.... (4 indent ) Grating

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.... (4 indent ) Filter

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... (3 indent ) Prism

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... (3 indent ) Grating

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... (3 indent ) Lens

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.. (2 indent ) Multiple Access (e.g., WDMA)

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.. (2 indent ) Electrically controlled single source

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.. (2 indent ) Different sources

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... (3 indent ) Including pumping

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.. (2 indent ) Including feedback

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... (3 indent ) Power control

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... (3 indent ) Wavelength control

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.. (2 indent ) Through free space

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.. (2 indent ) Repeater

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. (1 indent ) Time division

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.. (2 indent ) Multiple access (e.g., TDMA, CSMA)

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.. (2 indent ) Subscriber system

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.. (2 indent ) By specific optical element

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.. (2 indent ) Including delay

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.. (2 indent ) Through free space

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UNDERWATER

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. (1 indent ) Cable repeater

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REMOTE CONTROL

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. (1 indent ) Bidirectional (i.e., monitoring or acknowledge)

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.. (2 indent ) Interrogator system

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. (1 indent ) In industrial environment or hazardous environmrnt

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.. (2 indent ) Through optical fiber or waveguide

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. (1 indent ) Switching

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. (1 indent ) Plural

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. (1 indent ) Through optical fiber or waveguide

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. (1 indent ) Rotating part

115

HYBRID COMMUNICATION SYSTEM (E.G., OPTICAL AND RF)

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. (1 indent ) Including specific optical interface

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.. (2 indent ) Housing or mounting

118

OPTICAL COMMUNICATION OVER FREEE SPACE

119

. (1 indent ) Compensation

120

.. (2 indent ) Power control

121

. (1 indent ) Satellite system

122

.. (2 indent ) Including alignment

123

... (3 indent ) Feedback control

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.. (2 indent ) Space to space

125

.. (2 indent ) Space to ground or ground to space

126

. (1 indent ) Specific repeater

127

. (1 indent ) In an office environment

128

. (1 indent ) Transceivers

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.. (2 indent ) Including alignment

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. (1 indent ) Transmitter and receiver

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.. (2 indent ) Including alignment

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PHOTOPHONE

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. (1 indent ) Specific transducer

134

.. (2 indent ) Including optical fiber or waveguide

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OPTICAL TRANSCEIVER

136

. (1 indent ) Including compensation

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. (1 indent ) Including feedback

138

. (1 indent ) Single device as transmitter and receiver

139

. (1 indent ) Including optical fiber or waveguide

140

TRANSMITTER AND RECEIVER SYSTEM

141

. (1 indent ) Including optical waveguide

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.. (2 indent ) Specific type of fiber or waveguide

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... (3 indent ) Multimode

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... (3 indent ) Monomode

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... (3 indent ) Redundant fibers

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.. (2 indent ) Soliton

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.. (2 indent ) Dispersion compensation

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... (3 indent ) Using dispersion compensation optical fiber (e.g., DCOF)

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... (3 indent ) Using equalizing filter (e.g., interferometer, grating)

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... (3 indent ) Using optical phase conjugation

151

. (1 indent ) Presence detection

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. (1 indent ) Including polarization

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. (1 indent ) One transmitter, plural receivers

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. (1 indent ) Including synchronization

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.. (2 indent ) Clock recovery

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. (1 indent ) Including alignment between transmitter and receiver

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. (1 indent ) Including pumping

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. (1 indent ) Including compensation

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.. (2 indent ) Reducing distortion or dispersion

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.. (2 indent ) Using optical amplifier

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.. (2 indent ) Using delay

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. (1 indent ) Including feedback from receiver

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. (1 indent ) Including electrical oscillator

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. (1 indent ) Including optical circuit board

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. (1 indent ) Plural stations

166

.. (2 indent ) Address directing connections

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.. (2 indent ) Unidirectional or loopback

167.5

.. (2 indent ) Central or master station

168

. (1 indent ) Passive system

169

.. (2 indent ) Retroreflection

170

. (1 indent ) Retroreflection

171

. (1 indent ) Received signal supplies power distribution to diverse devices

172

. (1 indent ) Including visible light modulation

173

OPTICAL REPEATER SYSTEM

174

. (1 indent ) Demodulating

175

. (1 indent ) Regenerative

176

.. (2 indent ) Modulation conversion

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. (1 indent ) Monitoring

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. (1 indent ) Specific optical waveguide

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.. (2 indent ) Soliton

180

. (1 indent ) Specific optical elements

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. (1 indent ) Supervisory signal by repeater

182

TRANSMITTER

183

. (1 indent ) Having particular modulation

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.. (2 indent ) Including polarization

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.. (2 indent ) Hybrid modulation

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.. (2 indent ) Intensity modulation

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.. (2 indent ) Frequency modulation

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.. (2 indent ) Phase modulation

189

.. (2 indent ) Pulse modulation

190

... (3 indent ) Pulse-code

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... (3 indent ) Pulse time

192

. (1 indent ) Including compensation

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.. (2 indent ) Precompensation (e.g., prechirping, predistortion

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.. (2 indent ) For noise or distortion

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.. (2 indent ) Including feedback

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... (3 indent ) For wavelength control

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... (3 indent ) For power control

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... (3 indent ) For modulator control

199

. (1 indent ) Chirping

200

. (1 indent ) Including optical waveguide

201

. (1 indent ) Including specific optical elements

202

RECEIVER

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. (1 indent ) Homodyne

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. (1 indent ) Heterodyne

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.. (2 indent ) Including polarization

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... (3 indent ) Having feedback

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.. (2 indent ) Specific optical elements

208

. (1 indent ) Including postcompensation

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.. (2 indent ) Feedback

210

.. (2 indent ) Amplitude

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.. (2 indent ) Intermodulation

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. (1 indent ) Including optical element (e.g., lens, mirror, etc.)

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.. (2 indent ) Having feedback

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. (1 indent ) Including optical waveguide

	FOREIGN ART COLLECTIONS

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.

FOR100

OPTICAL COMMUNICATION (359/109)

FOR101

. (1 indent ) Diagnostic testing of optical communication (359/110)

FOR102

. (1 indent ) Interference signal transmission or elimination (e.g., jamming or antijamming (359/111)

FOR103

. (1 indent ) Eavesdropping (359/112)

FOR104

. (1 indent ) Duplex (359/113)

FOR105

.. (2 indent ) Wavelength division (359/114)

FOR106

. (1 indent ) Multiplex (359/115)

FOR107

.. (2 indent ) Mode (359/116)

FOR108

.. (2 indent ) Spatial or switching (359/117)

FOR109

.. (2 indent ) Optical local area network (LAN) (359/118)

FOR110

... (3 indent ) Loop (359/119)

FOR111

... (3 indent ) Active star (359/120)

FOR112

... (3 indent ) Passive star (359/121)

FOR113

.. (2 indent ) Polarization (359/122)

FOR114

.. (2 indent ) Time and frequency division (359/123)

FOR115

.. (2 indent ) Wavelength division/frequency division (includes scattering, e.g., Raman, Brillouin, etc.) (359/124)

FOR116

... (3 indent ) Subscriber system (359/125)

FOR117

.... (4 indent ) Optical source at only one station (359/126)

FOR118

... (3 indent ) By optical coupling (359/127)

FOR119

.... (4 indent ) Switch (359/128)

FOR120

.... (4 indent ) Prism (359/129)

FOR121

.... (4 indent ) Grating (359/130)

FOR122

.... (4 indent ) Lens (359/131)

FOR123

... (3 indent ) Single source, electrically controlled (359/132)

FOR124

... (3 indent ) Different sources (359/133)

FOR125

.... (4 indent ) With pump (359/134)

FOR126

.. (2 indent ) Time division (359/135)

FOR127

... (3 indent ) Multiple access (e.g., CSMA, CDMA) (359/136)

FOR128

... (3 indent ) Subscriber system (359/137)

FOR129

... (3 indent ) By specific optical element (359/138)

FOR130

.... (4 indent ) Optical switch (359/139)

FOR131

... (3 indent ) With delay (359/140)

FOR132

. (1 indent ) Underwater (359/141)

FOR133

. (1 indent ) Remote control (359/142)

FOR134

.. (2 indent ) Bidirectional (i.e., monitoring or acknowledge) (359/143)

FOR135

.. (2 indent ) In industrial environment (e.g., robot control) (359/144)

FOR136

.. (2 indent ) With radio link (359/145)

FOR137

.. (2 indent ) With television or radio system (359/146)

FOR138

.. (2 indent ) Switching (359/147)

FOR139

.. (2 indent ) Plural functions (359/148)

FOR140

. (1 indent ) Photophone (359/149)

FOR141

.. (2 indent ) Transducer, per se (359/150)

FOR142

... (3 indent ) With optical fiber or waveguide (359/151)

FOR143

. (1 indent ) Optical transceiver (359/152)

FOR144

.. (2 indent ) Including compensation (359/153)

FOR145

. (1 indent ) Transmitter and receiver system (359/154)

FOR146

.. (2 indent ) Presence detector (359/155)

FOR147

.. (2 indent ) With polarization (359/156)

FOR148

.. (2 indent ) One transmitter, plural receivers (359/157)

FOR149

.. (2 indent ) With synchronization (359/158)

FOR150

.. (2 indent ) With alignment between transmitter and receiver (359/159)

FOR151

.. (2 indent ) With pumping (359/160)

FOR152

.. (2 indent ) With compensation (359/161)

FOR153

.. (2 indent ) With electrical oscillator (359/162)

FOR154

.. (2 indent ) With optical circuit board (359/163)

FOR155

.. (2 indent ) Plural stations (359/164)

FOR156

... (3 indent ) Address directing connections (359/165)

FOR157

... (3 indent ) Unidirectional or loopback (359/166)

FOR158

... (3 indent ) Central or master station (359/167)

FOR159

.. (2 indent ) Passive system (359/168)

FOR160

... (3 indent ) Retroreflection (359/169)

FOR161

.. (2 indent ) Retroreflection (359/170)

FOR162

.. (2 indent ) Received signal supplies power distribution to diverse devices (359/171)

FOR163

.. (2 indent ) Satellite communications (359/172)

FOR164

.. (2 indent ) Including optical waveguide (359/173)

FOR165

. (1 indent ) Optical repeater system (359/174)

FOR166

.. (2 indent ) Demodulating (359/175)

FOR167

.. (2 indent ) Regenerative (359/176)

FOR168

... (3 indent ) Monitoring (359/177)

FOR169

.. (2 indent ) Star (359/178)

FOR170

.. (2 indent ) Including optical waveguide (359/179)

FOR171

. (1 indent ) Transmitter (359/180)

FOR172

.. (2 indent ) With particular modulation (359/181)

FOR173

... (3 indent ) Frequency modulation (359/182)

FOR174

... (3 indent ) Phase modulation (359/183)

FOR175

... (3 indent ) Pulse modulation (359/184)

FOR176

.... (4 indent ) Pulse-code (359/185)

FOR177

.... (4 indent ) Pulse time (359/186)

FOR178

.. (2 indent ) With feedback (359/187)

FOR179

.. (2 indent ) Including optical waveguide (359/188)

FOR180

. (1 indent ) Receiver (359/189)

FOR181

.. (2 indent ) Homodyne (359/190)

FOR182

.. (2 indent ) Heterodyne (359/191)

FOR183

... (3 indent ) With polarization (359/192)

FOR184

.. (2 indent ) With optical element (e.g., lens, mirror, etc.) (359/193)

FOR185

.. (2 indent ) Automatic gain control (359/194)

FOR186

.. (2 indent ) With optical waveguide) (359/195)

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