Optical branching unit and optical branching method
First Claim
1. An optical branching device comprising:
- an optical add-drop circuit that outputs a first input wavelength division multiplexing (WDM) signal to any of a plurality of paths on a per-wavelength basis;
a light wavelength detector that detects a wavelength of the first WDM signal;
a wavelength database storing, on a per-wavelength basis, information about one or more sections through which an optical signal contained in the first WDM signal passes, the sections being external to the optical branching device and coupled with the optical branching device; and
a controller configured to change a setting of the optical add-drop circuit so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when every wavelength stored in the wavelength database for the particular section is not detected in the particular section by the light wavelength detector.
1 Assignment
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Accused Products
Abstract
In order to allow for a flexible network configuration and establish an alternative path without performing communication between optical branching units in the event of a failure on a path in an optical communication system to which a plurality of optical branching units are connected, the optical branching unit includes optical add-drop unit for outputting an input WDM signal to any of a plurality of paths on a per-wavelength basis, light wavelength detecting unit for detecting a wavelength of the input WDM signal, a wavelength database storing, on a per-wavelength basis, information about sections through which optical signals contained in the WDM signal pass, and control unit for changing a setting of the optical add-drop unit so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when all wavelengths stored in the wavelength database are not detected in the particular section by the light wavelength detecting unit.
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Citations
20 Claims
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1. An optical branching device comprising:
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an optical add-drop circuit that outputs a first input wavelength division multiplexing (WDM) signal to any of a plurality of paths on a per-wavelength basis; a light wavelength detector that detects a wavelength of the first WDM signal; a wavelength database storing, on a per-wavelength basis, information about one or more sections through which an optical signal contained in the first WDM signal passes, the sections being external to the optical branching device and coupled with the optical branching device; and a controller configured to change a setting of the optical add-drop circuit so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when every wavelength stored in the wavelength database for the particular section is not detected in the particular section by the light wavelength detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13)
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8. An optical branching method comprising:
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outputting a first input WDM signal to any of a plurality of paths on a per-wavelength basis; detecting a wavelength of the first WDM signal; storing, in a wavelength database, on a per-wavelength basis, information about one or more sections through which an optical signal contained in the WDM signal passes, the sections being external to an optical branching device and coupled with the optical branching device; and changing a setting of a path of an optical signal of a wavelength passing through a particular one of the sections so that the path bypasses the particular section when every wavelength stored in the wavelength database for the particular section is not detected in the particular section. - View Dependent Claims (14, 15, 16, 17)
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9. An optical branching device comprising:
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optical add-drop means for outputting an input WDM signal to any of a plurality of paths on a per-wavelength basis; light wavelength detecting means for detecting a wavelength of the input WDM signal; a wavelength database storing, on a per-wavelength basis, information about one or more sections through which an optical signal contained in the WDM signal passes, the sections being external to the optical branching device and coupled with the optical branching device; and control means for changing a setting of the optical add-drop means so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when every wavelength stored in the wavelength database for the particular section is not detected in the particular section by the light wavelength detecting means. - View Dependent Claims (18, 19, 20)
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Specification