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Class Information
Number: 398
Name: Optical communications >
Description: This class provides for all types of communication systems in which optical signals are used to transmit modulated carrier wave information between points. Such communication includes transmitting an intelligence-bearing signal from one point to another in the form of variations in a characteristic of the light wave. The communication may be through free space, fibers or waveguides. These are used to transfer the information with an optical beam, and this beam can be used in various communication schemes to enable the most effective or desired method of moving the information, including optical multiplexing when plural information signals or plural transmitters and receivers are utilized.










Class Number Class Name No. of Patents
398/9

Diagnostic testing

949
398/25

Determination of communication parameter

539
398/37

Amplifier or repeater operation

254
398/27

Bit error rate

207
398/36

Collision detection

32
398/28

Fiber characteristic

129
398/29

Dispersion

137
398/38

Power

320
398/26

Signal to noise ratio

196
398/35

Tdm system

37
398/30

Using supervisory signal

222
398/31

Different wavelengths for diagnostic and communication

189
398/33

Monitoring

550
398/32

Pilot signal

193
398/34

Wdm system

268
398/17

Fault detection

293
398/20

Optical fiber

160
398/21

Determined by reflection from break in fiber

72
398/24

Receiver

81
398/18

Repeater

85
398/19

Switch

135
398/22

Transceiver

133
398/23

Transmitter

90
398/10

Fault location

140
398/13

Fiber or waveguide

121
398/11

Repeater

62
398/15

Stop transmission or reduce power

140
398/12

Switch

103
398/14

Wdm

78
398/16

Test signal

222
398/41

Duplex

139
398/42

Wavelength division

164
398/40

Eavesdropping

74
398/1

Fault recovery

920
398/2

Bypass inoperative element

175
398/3

In a ring or loop

194
398/4

Using a secondary ring or loop

160
398/5

Spare channel or standby optical fiber

391
398/6

In a repeater system

51
398/8

Tdm

32
398/7

Wdm

150
398/115

Hybrid communication system (e.g., optical and rf)

579
398/116

Including specific optical interface

190
398/117

Housing or mounting

102
398/39

Interference signal transmission or elimination (e.g., jamming or antijamming)

59
398/43

Multiplex

344
398/66

Broadcast and distribution system

483
398/67

Bidirectional

372
398/68

Wdm

349
398/73

Bus

35
398/70

Hub or central office

273
398/71

Including subscribers

368
398/72

Bidirectional

491
398/69

With variable frequency channel assignment

163
398/77

Code division multiplexing

105
398/78

Multiple access (e.g., cdma)

105
398/74

Hybrid

108
398/75

Time and wavelength division

232
398/44

Mode

28
398/58

Optical local area network (lan)

477
398/61

Active star

77
398/62

Repeater

35
398/60

Bus

108
398/63

Passive star

176
398/64

Repeater

23
398/59

Ring or loop

416
398/45

Optical switching

684
398/46

Hybrid

98
398/47

Time and wavelength

165
398/55

Space

151
398/56

Crossconnect

206
398/57

Path finding or path routing

225
398/52

Time

136
398/53

Including delay

140
398/54

Including photonic packet switching

252
398/48

Wavelength

445
398/50

Crossconnect

334
398/51

Including photonic packet switching

289
398/49

Router

315
398/65

Polarization

249
398/76

Subcarrier multiplexing

169
398/98

Time division

338
398/101

By specific optical element

87
398/102

Including delay

201
398/99

Multiple access (e.g., tdma, csma)

179
398/100

Subscriber system

228
398/103

Through free space

38
398/79

Wavelength division or frequency division (e.g., raman, brillouin, etc.)

1221
398/82

By optical coupling

715
398/83

Add or drop

585
398/85

Filter

310
398/84

Grating

263
398/87

Grating

448
398/88

Lens

123
398/86

Prism

80
398/91

Different sources

341
398/92

Including pumping

191
398/81

Dispersion compensation

529
398/90

Electrically controlled single source

49
398/93

Including feedback

86
398/94

Power control

217
398/95

Wavelength control

173
398/89

Multiple access (e.g., wdma)

52
398/97

Repeater

167
398/80

Soliton

35
398/96

Through free space

48
398/118

Optical communication over freee space

372
398/119

Compensation

145
398/120

Power control

58
398/127

In an office environment

141
398/121

Satellite system

103
398/122

Including alignment

112
398/123

Feedback control

58
398/125

Space to ground or ground to space

79
398/124

Space to space

80
398/126

Specific repeater

87
398/128

Transceivers

294
398/129

Including alignment

264
398/130

Transmitter and receiver

322
398/131

Including alignment

261
398/173

Optical repeater system

158
398/174

Demodulating

21
398/177

Monitoring

325
398/175

Regenerative

229
398/176

Modulation conversion

82
398/180

Specific optical elements

203
398/178

Specific optical waveguide

124
398/179

Soliton

37
398/181

Supervisory signal by repeater

166
398/135

Optical transceiver

757
398/136

Including compensation

342
398/137

Including feedback

165
398/139

Including optical fiber or waveguide

491
398/138

Single device as transmitter and receiver

357
398/132

Photophone

34
398/133

Specific transducer

34
398/134

Including optical fiber or waveguide

47
398/202

Receiver

916
398/204

Heterodyne

264
398/205

Including polarization

228
398/206

Having feedback

106
398/207

Specific optical elements

122
398/203

Homodyne

116
398/212

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

355
398/213

Having feedback

171
398/214

Including optical waveguide

239
398/208

Including postcompensation

544
398/210

Amplitude

161
398/209

Feedback

383
398/211

Intermodulation

48
398/106

Remote control

378
398/107

Bidirectional (i.e., monitoring or acknowledge)

192
398/108

Interrogator system

91
398/109

In industrial environment or hazardous environmrnt

87
398/110

Through optical fiber or waveguide

58
398/112

Plural

113
398/114

Rotating part

64
398/111

Switching

82
398/113

Through optical fiber or waveguide

100
398/140

Transmitter and receiver system

463
398/156

Including alignment between transmitter and receiver

139
398/158

Including compensation

561
398/159

Reducing distortion or dispersion

491
398/161

Using delay

244
398/160

Using optical amplifier

160
398/163

Including electrical oscillator

102
398/162

Including feedback from receiver

196
398/164

Including optical circuit board

422
398/141

Including optical waveguide

564
398/147

Dispersion compensation

647
398/148

Using dispersion compensation optical fiber (e.g., dcof)

179
398/149

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

148
398/150

Using optical phase conjugation

62
398/146

Soliton

77
398/142

Specific type of fiber or waveguide

111
398/144

Monomode

73
398/143

Multimode

64
398/145

Redundant fibers

29
398/152

Including polarization

419
398/157

Including pumping

157
398/154

Including synchronization

522
398/155

Clock recovery

355
398/172

Including visible light modulation

137
398/153

One transmitter, plural receivers

61
398/168

Passive system

188
398/169

Retroreflection

85
398/165

Plural stations

51
398/166

Address directing connections

86
398/167.5

Central or master station

110
398/167

Unidirectional or loopback

41
398/151

Presence detection

112
398/171

Received signal supplies power distribution to diverse devices

65
398/170

Retroreflection

115
398/182

Transmitter

503
398/199

Chirping

87
398/183

Having particular modulation

723
398/187

Frequency modulation

224
398/185

Hybrid modulation

275
398/184

Including polarization

190
398/186

Intensity modulation

309
398/188

Phase modulation

441
398/189

Pulse modulation

230
398/191

Pulse time

104
398/190

Pulse-code

89
398/192

Including compensation

386
398/194

For noise or distortion

248
398/195

Including feedback

298
398/198

For modulator control

263
398/197

For power control

302
398/196

For wavelength control

206
398/193

Precompensation (e.g., prechirping, predistortion

320
398/200

Including optical waveguide

249
398/201

Including specific optical elements

444
398/104

Underwater

63
398/105

Cable repeater

46
 
 
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