Optical transmitter
First Claim
1. A wavelength-division multiplexing transmitter comprising:
- an optical branching part for branching a wavelength-division multiplexed input optical signal into a plurality of optical signals;
a plurality of wavelength-selective devices, for selecting as output wavelength the wavelengths of each of said optical signals branched by said optical branching part, for variably attenuating said optical signals each having said selected output wavelength, and for outputting said variably attenuated optical signals; and
an optical coupling part for coupling said variably attenuated optical signals output from said plurality of wavelength-selective devices;
wherein said optical branching part branches the input optical signal into the plural optical signals with a different branching power ratio, and/or said optical coupling part couples said variably attenuated optical signals output from said plural wavelength-selective devices with a different branching power ratio.
1 Assignment
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Accused Products
Abstract
A wavelength-division multiplexing transmitter that is capable of enhancing its ability to compensate for a difference in light intensity between wavelengths. The wavelength-division multiplexing transmitter includes an optical branching part for branching a wavelength-division multiplexed input optical signal into a plurality of optical signals, a plurality of wavelength-selective devices for selecting as output wavelengths the wavelengths of each of the optical signals branched by the optical branching part, and an optical coupling part for coupling the output wavelengths respectively output from the plurality of wavelength-selective devices. At least either the branching in the optical branching part or the coupling in the optical coupling part is performed at a power ratio M:N where M and N differ from each other.
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Citations
11 Claims
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1. A wavelength-division multiplexing transmitter comprising:
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an optical branching part for branching a wavelength-division multiplexed input optical signal into a plurality of optical signals; a plurality of wavelength-selective devices, for selecting as output wavelength the wavelengths of each of said optical signals branched by said optical branching part, for variably attenuating said optical signals each having said selected output wavelength, and for outputting said variably attenuated optical signals; and an optical coupling part for coupling said variably attenuated optical signals output from said plurality of wavelength-selective devices; wherein said optical branching part branches the input optical signal into the plural optical signals with a different branching power ratio, and/or said optical coupling part couples said variably attenuated optical signals output from said plural wavelength-selective devices with a different branching power ratio. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wavelength-division multiplexing transmitter comprising:
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an optical branching part for branching a wavelength-division multiplexed input optical signal into a plurality of optical signals; a plurality of wavelength-selective devices for selecting as output wavelengths the wavelengths of each of said optical signals branched by said optical branching part; and an optical coupling part for coupling said output wavelengths respectively output from said plurality of wavelength-selective devices; wherein at least either the branching in said optical branching part or the coupling in said optical coupling part is performed at a power ratio M;
N where M and N differ from each other, and the wavelength-division multiplexing transmitter further comprising;a power monitor for monitoring an optical power at each of the wavelengths of an optical signal output from said optical coupling part; and a wavelength-selective device control part for controlling each of said wavelength-selective devices so that said output wavelengths to said optical coupling part are selected in each of said wavelength-selective devices, based on said optical power monitored at each of the wavelengths of said output optical signal by said power monitor. - View Dependent Claims (8, 9, 10)
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11. A wavelength-division multiplexing transmitter comprising:
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an optical branching part for branching a wavelength-division multiplexed input optical signal into a plurality of optical signals;
a plurality of wavelength-selective switches for selecting as output wavelengths the wavelengths of each of said optical signals branched by said optical branching part; andan optical coupling part for coupling said output wavelengths respectively output from said plurality of wavelength-selective switches; wherein at least either the branching in said optical branching part or the coupling in said optical coupling part is performed at a power ratio M;
N where M and N differ from each other, and said plurality of wavelength-selective switches have a single input and a plurality of outputs, or have a plurality of inputs and a single output.
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Specification