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AssigneeNEC Corporation
InventorYutaka Yano
Estimating the term…
When using a wavelength multiplexing unit of a wavelength multiplexing optical transmission system in which a wavelength tunable type optical transmitter and a wavelength multiplexer having no wavelength selectivity are combined, undesired light that is not supposed to be flown into a wavelength channel may be mixed therein. A wavelength multiplexing unit includes: transmitters having functions of outputting signal lights of different wavelengths from each other and changing the wavelengths; band-limiting filters provided to each of the transmitters, which have functions of eliminating the lights out of bands from the signal lights outputted from the transmitters, and changing the center wavelengths of the bands; and a wavelength multiplexer including ports capable of inputting the lights of any wavelengths, which inputs signal lights from which the light out of the bands is eliminated by the band-limiting filters and multiplexes the signal lights.
A wavelength multiplexing unit of a wavelength multiplexing optical transmission system which includes:
A wavelength multiplexing method which includes:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Wavelength-division multiplex systems: power control, e.g. to keep the total optical power constant
Multiplex communication
About 5 years 1 month of term left · ends 21 Nov 2031 (estimated)
This application is based upon and claims the benefit of priority from Japanese patent application No. 2010-193528, filed on Aug. 31, 2010, the disclosure of which is incorporated herein in its entirety by reference.
1. Field of the Invention
The present invention relates to a wavelength multiplexing unit and a wavelength multiplexing method of a wavelength multiplexing optical transmission system used in optical communications.
FIG. 1 is a block diagram showing a wavelength multiplexing unit of a wavelength multiplexing optical transmission system according to a first exemplary embodiment;
FIG. 2 is a block diagram showing an example of a band-limiting filter shown in FIG. 1;
FIGS. 3A-3C are block diagrams showing further specific examples of the band-limiting filter shown in FIG. 2, in which FIG. 3A is a case of using an optical fiber Bragg grating (referred to as “FBG (Fiber Bragg Grating)” hereinafter, FIG. 3B is a case of using a Mach-Zehnder Interferometer (referred to as MZI) hereinafter, and FIG. 3C is a case of using a ring resonator;
Hereinafter, best modes for embodying the present invention (referred to as exemplary embodiments hereinafter) will be described by referring to the accompanying drawings.
(First Exemplary Embodiment)
FIG. 1 is a block diagram showing a wavelength multiplexing unit of a wavelength multiplexing optical transmission system according to a first exemplary embodiment. FIG. 2 is a block diagram showing an example of a band-limiting filter shown in FIG. 1. FIG. 3 shows block diagrams of more specific examples of the band-limiting filter shown in FIG. 2. Hereinafter, explanations will be provided by referring to the accompanying drawings.