Optical communication network system
First Claim
1. A fiber optic communication system comprising:
- an arrayed waveguide grating (AWG) that has N optical input ports (where N is an integer greater than or equal to
2) and N optical output ports, and that has a routing function that routes from an input port to an output port in accordance with a wavelength of an optical signal that has been inputted into the input port, and M (where M is an integer no smaller than 2, nor greater than an integer N) network-node equipments connected via optical transmission paths so as to form a geometrically star-shaped physical star topology having the AWG in the center,wherein said network-node equipments comprise a device of wavelength switching that switches the wavelength of said optical signals in order to dynamically change a logical network topology that indicates a geometrical form of routes of the optical signals used for transmitting/receiving data (hereunder referred to as optical signals) between network-node equipments.
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Accused Products
Abstract
A fiber optic communication system includes a device of switching and setting wavelength of optical signals used in communication by network-node equipments, which sets the mapping of the wavelength of the optical signal used in communication by the network node equipments, and the input/output ports of an array waveguide grating (AWG), so as to construct a predetermined logical network topology by a plurality of network node equipments which are connected via optical fibers to the array waveguide grating that outputs optical signals inputted to optical input ports, to predetermined optical output ports in accordance with the wavelength thereof. As well as enabling a simple construction, it is easy to realize flexible network design, construction, and operation, and different network groups can also be easily connected to each other. Moreover, a fiber optic communication system having robust security and which can be stably operated even at the time of failure is realized at low cost.
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Citations
31 Claims
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1. A fiber optic communication system comprising:
- an arrayed waveguide grating (AWG) that has N optical input ports (where N is an integer greater than or equal to
2) and N optical output ports, and that has a routing function that routes from an input port to an output port in accordance with a wavelength of an optical signal that has been inputted into the input port, and M (where M is an integer no smaller than 2, nor greater than an integer N) network-node equipments connected via optical transmission paths so as to form a geometrically star-shaped physical star topology having the AWG in the center,wherein said network-node equipments comprise a device of wavelength switching that switches the wavelength of said optical signals in order to dynamically change a logical network topology that indicates a geometrical form of routes of the optical signals used for transmitting/receiving data (hereunder referred to as optical signals) between network-node equipments. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- an arrayed waveguide grating (AWG) that has N optical input ports (where N is an integer greater than or equal to
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30. A central-management-equipment that is connected to M (where M is an integer no smaller than 2, nor greater than an integer N) network-node equipments connected via optical transmission paths and configured so as to form a geometrically star-shaped physical star topology having in the center an arrayed waveguide grating (AWG) that has N optical input ports (where N is an integer greater than or equal to 2) and N optical output ports and a routing function that routes from an input port to an output port in accordance with a wavelength of an optical signal that has been inputted into the input port,
wherein said central-management-equipment comprises a device of controlling that transmits to said network-node equipments a control signal that includes information of changing wavelength of the optical signals and the device of controlling causes the switching of the wavelength of the optical signals, and receives from said network-node equipments a control signal that includes information of communication status, in order to dynamically change a logical network topology that indicates a geometrical form of routes of the optical signals used for transmitting/receiving data (hereunder referred to as optical signals) between said network-node equipments.
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31. A network-node equipment that is connected to M (M is an integer greater than or equal to 1 and less than or equal to N−
- 1) other network-node equipments via an arrayed waveguide grating (AWG) that has N (N is an integer greater than or equal to
2) optical input ports and N optical output ports and a routing function that routes from an input port to an output port in accordance with a wavelength of an optical signal that has been inputted into the input port, comprising;a device of synchronizing clock time that synchronizes the clock time of each of the other network-node equipments, a device of information-storing that stores new information of changing wavelength of optical signals, for dynamically changing a logical network topology that indicates a geometrical form of routes of the optical signals used for transmitting/receiving data between other network-node equipments (hereunder referred to as optical signals), and information of reconfiguring time of the logical network topology that includes the time at which changing wavelength should be executed; and a device of wavelength switching that switches a wavelength of the optical signals in accordance with said information of changing wavelength and said information of reconfiguring time of the logical network topology.
- 1) other network-node equipments via an arrayed waveguide grating (AWG) that has N (N is an integer greater than or equal to
Specification