Optical Signal Transmission Device and Optical Communication Network

• US 20080131128A1
• Filed: 01/23/2006
• Published: 06/05/2008
• Est. Priority Date: 01/28/2005
• Status: Active Grant

• Current Assignee: Canare Electric (Shanghai) Co., Ltd.
• Original Assignee: Canare Electric (Shanghai) Co., Ltd.
• Inventors: Ota, Takeshi
• Granted Patent: US 7,787,772 B2
• Time in Patent Office: Days
• US Class Current: 398/79
• CPC Class Codes: H04J 14/0201 Add-and-drop multiplexing
• CPC Class Codes: H04J 14/0212 using optical switches or wavelength selective switches [WSS]
• CPC Class Codes: H04J 14/0213 Groups of channels or wave bands arrangements
• CPC Class Codes: H04J 14/0216 Bidirectional architectures
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0241 Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
• CPC Class Codes: H04J 14/0282 WDM tree architectures
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04J 14/0286 WDM hierarchical architectures
• CPC Class Codes: H04J 14/0295 Shared protection at the optical channel (1:1, n:m)
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 12/423 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/437 Ring fault isolation or reconfiguration for SDH/SONET ring networks H04J3/085
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 2011/0016 using wavelength multiplexing or demultiplexing
• CPC Class Codes: H04Q 2011/0052 Interconnection of switches
• CPC Class Codes: H04Q 2011/0081 Fault tolerance; Redundancy; Recovery; Reconfigurability
• CPC Class Codes: H04Q 2011/0092 Ring
• CPC Class Codes: H04Q 2011/0094 Star

Abstract

By using wavelength division multiplexing technologies, redundant star topology network is constructed on a ring-shaped optical fiber network. Edge-switches 5a, 5b, 5c, and 5d are connected to client station groups 6a, 6b, 6c, and 6d are connected, respectively. The edge-switches 5a, 5b, 5c, and 5d are connected to edge optical transport device 2a, 2b, 2c, and 2d. Core-switches 4a and 4b are connected to a core optical transport device 1. The edge optical transport device 2a, 2b, 2c, 2d, and the core optical transport device 1 are connected to a ring-shaped single optical fiber 3. A communication circuit 7 is formed among core optical transport device 1, edge optical transport devices 2a, 2b, 2c, and 2d, by using wavelength division multiplexing technologies.

Claims

1-75. -75. (canceled)

76. An optical transport device comprising a first wavelength division multiplexing mean, a second wavelength division multiplexing mean, a third wavelength division multiplexing mean, an optical amplifying mean, and a remote optical fiber wherein:

(a) a transmitting signal is transmitted to said remote optical fiber through said first wavelength division multiplexing mean, said optical amplifying mean, said second wavelength division multiplexing mean, and said third wavelength division multiplexing mean; and

,

(b) a receiving signal is received from said remote optical fiber through said third wavelength division multiplexing mean, said first wavelength division multiplexing mean, said optical amplifying mean, and said second wavelength division multiplexing mean.

77. An optical transport device of claim 76 further comprising an variable optical signal attenuating mean wherein said variable optical signal attenuating mean is disposed between said third wavelength division multiplexing mean and said first wavelength division multiplexing mean.

78. An optical transport device of claim 77 wherein said variable optical signal attenuating mean is a pluggable fixed optical signal attenuating mean.

79. An optical transport device of claim 76 wherein said optical amplifying mean is maintained at constant gain.

80. An optical transport device of claim 76 wherein said optical amplifying mean is an erbium-doped optical amplifier.

81. An optical transport device of claim 76 further comprising an optical signal receiving mean wherein said optical signal receiving mean comprises a PIN photodiode.

82. An optical line amplifier for bi-directional optical transmission system comprising a first input/output port, a second input/output port, an optical amplifying mean, a first wavelength division multiplexing mean, a second wavelength multiplexing mean, a third wavelength multiplexing mean, a fourth wavelength multiplexing mean, a first variable optical signal attenuating mean, and a second variable optical signal attenuating mean:

wherein,

(a) an optical signal of a first wavelength inputted from said first input/output port is transmitted to said second input/output port through said first wavelength division multiplexing mean, said first variable optical signal attenuating mean, said second wavelength division multiplexing mean, said optical amplifying mean, said third wavelength division multiplexing mean, and said fourth wavelength division multiplexing mean; and

,

(b) an optical signal of a second wavelength inputted from said second input/output port is transmitted to said first input/output port through said fourth wavelength division multiplexing mean, said second variable optical signal attenuating mean, said second wavelength division multiplexing mean, said optical amplifying mean, said third wavelength division multiplexing mean, and said first wavelength division multiplexing mean.

83. An optical line amplifier of claim 82 wherein at least one of said first and second variable optical signal attenuating means is a pluggable fixed optical signal attenuating mean.

84. An optical line amplifier of claim 82 wherein said optical amplifying mean comprises a first-stage optical amplifier module and a second-stage optical amplifier module.

85. An optical line amplifier of claim 84 further comprising a gain flattening mean wherein said gain flattening mean is disposed between said first-stage optical amplifier module and said second-stage optical amplifier module.

86. An optical line amplifier of claim 84 further comprising a dispersion compensation mean wherein said dispersion compensation mean is disposed between said first-stage optical amplifier module and said second-stage optical amplifier module.

87. An optical line amplifier of claim 82 wherein said optical amplifying mean is maintained at constant gain.

88. An optical transport device of claim 82 wherein said optical amplifying mean is an erbium-doped optical amplifier.

89. An optical transport device for bi-directional optical transmission system comprising a first input/output port, a second input/output port, an optical amplifying mean, a first wavelength division multiplexing mean, a second wavelength multiplexing mean, a third wavelength multiplexing mean, a fourth wavelength multiplexing mean, and an optical add drop mean:

wherein,

(a) said optical amplifying mean comprises a first-stage optical amplifier module and a second-stage optical amplifier module;

(b) optical signals inputted from said first input/output port is transmitted to said second input/output port through said first wavelength division multiplexing mean, said second wavelength division multiplexing mean, said optical amplifying mean, said third wavelength division multiplexing mean, and said fourth wavelength division multiplexing mean;

(c) optical signals inputted from said second input/output port is transmitted to said first input/output port through said fourth wavelength division multiplexing mean, said second wavelength division multiplexing mean, said optical amplifying mean, said third wavelength division multiplexing mean, and said first wavelength division multiplexing means; and

,

(d) said optical add drop mean is disposed between said first-stage optical amplifier module and said second-stage optical amplifier module.

90. An optical transport device of claim 89 further comprising a first variable optical signal attenuating mean and a second variable optical signal attenuating mean:

wherein,

(a) said first variable optical signal attenuating mean is disposed between said first wavelength division multiplexing mean and said wavelength division multiplexing mean; and

,

(b) said second variable optical signal attenuating mean is disposed between said fourth wavelength division multiplexing mean and said second wavelength division multiplexing mean.

91. An optical transport device of claim 90 wherein at least one of said first and second variable optical signal attenuating means is a pluggable fixed optical signal attenuating mean.

92. An optical transport device of claim 89 further comprising a gain flattening mean wherein said gain flattening mean is disposed between said first-stage optical amplifier module and said second-stage optical amplifier module.

93. An optical transport device of claim 89 further comprising a dispersion compensation mean wherein said dispersion compensation mean is disposed between said first-stage optical amplifier module and said second-stage optical amplifier module.

94. An optical transport device of claim 89 wherein said optical amplifying mean is maintained at constant gain.

95. An optical transport device of claim 89 wherein said optical amplifying mean is an erbium-doped optical amplifier.

96. An optical transport device of claim 89 further comprising an optical signal receiving mean wherein said optical signal receiving mean comprises a PIN photodiode.