Variable wavelength light source, optical module and manufacturing method of variable wavelength light source
First Claim
1. A variable wavelength light source, comprising:
- a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually;
a plurality of photodetectors which detect light powers outputted via the respective throughports of the plurality of ring resonators;
a plurality of variable light units for changing transmittance of the multiple resonator by individually working on the plurality of resonators;
a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside;
a control unit which controls the plurality of variable light units based on the light powers detected by the photodetectors; and
light attenuators provided between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors.
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Accused Products
Abstract
The variable wavelength light source includes a multiple ring resonator including a plurality of resonators, photodetectors which detect light powers outputted from at least two out of the plurality of resonators via throughports, a plurality of variable light units for changing the transmittance of the multiple ring resonator by individually working on at least two out of the plurality of resonators, a light input/output unit which supplies the light to the multiple resonator and emits the light returned from the multiple resonator towards the outside, and a control unit which controls the plurality of variable light units in accordance with the light power detected by the photodetectors, wherein light attenuators are arranged between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors.
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Citations
13 Claims
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1. A variable wavelength light source, comprising:
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a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually; a plurality of photodetectors which detect light powers outputted via the respective throughports of the plurality of ring resonators; a plurality of variable light units for changing transmittance of the multiple resonator by individually working on the plurality of resonators; a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside; a control unit which controls the plurality of variable light units based on the light powers detected by the photodetectors; and light attenuators provided between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical module, comprising a variable wavelength light source, a case in which the variable wavelength light source is housed, and a light guide unit which guides light emitted from the variable wavelength light source towards outside the case, wherein the variable wavelength light source comprises:
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a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually; a plurality of photodetectors which detect light powers outputted via the respective throughports of the plurality of ring resonators; a plurality of variable light units for changing transmittance of the multiple resonator by individually working on the plurality of ring resonators; a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside; a control unit which controls the plurality of variable light units based on the light powers detected by the photodetectors; and light attenuators provided between the throughports and the photodetectors for attenuating the light emitted from the throughports before making incident on the photodetectors.
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9. A method for controlling a variable wavelength light source which comprises:
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a multiple resonator including a plurality of ring resonators which have different circumference lengths from each other and are coupled mutually; a plurality of light-receiving elements which detect light powers outputted via respective throughports of the plurality of resonators at the respective throughports; a plurality of variable light units for changing transmittance of the multiple resonator by individually working on at least two of the plurality of resonators; and a light input/output unit which supplies light to the multiple resonator and emits light returned from the multiple resonator towards outside, the variable wavelength light source controlling the plurality of variable light units in such a manner that a sum of the light powers detected by the plurality of light-receiving elements becomes minimum, the method comprising attenuating the light emitted from the throughports before making incident on the plurality of light-receiving elements. - View Dependent Claims (10, 11)
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12. A variable wavelength light source, comprising:
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a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually; a plurality of photodetecting means for detecting light powers outputted via the respective throughports of the plurality of ring resonators; a plurality of variable light means for changing transmittance of the multiple resonator by individually working on the plurality of resonators; a light input/output means for supplying light to the multiple resonator and emitting light returned from the multiple resonator towards outside; control means for controlling the plurality of variable light means based on the light powers detected by the photodetecting means; and light attenuating means provided between the throughports and the photodetecting means for attenuating the light emitted from the throughports before making incident on the photodetecting means.
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13. An optical module, comprising a variable wavelength light source, a case in which the variable wavelength light source is housed, and light guide means for guiding light emitted from the variable wavelength light source towards outside the case, wherein the variable wavelength light source comprises:
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a multiple resonator including a plurality of ring resonators having throughports, which have different circumference lengths from each other and are coupled mutually; a plurality of photodetecting means for detecting light powers outputted via the respective throughports of the plurality of ring resonators; a plurality of variable light means for changing transmittance of the multiple resonator by individually working on the plurality of ring resonators; light input/output means for supplying light to the multiple resonator and emitting light returned from the multiple resonator towards outside; control means for controlling the plurality of variable light means based on the light powers detected by the photodetecting means; and light attenuating means provided between the throughports and the photodetecting means for attenuating the light emitted from the throughports before making incident on the photodetecting means.
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Specification