Signal light monitoring apparatus, optical amplification apparatus and optical reception apparatus, and signal light monitoring method
First Claim
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1. An apparatus, comprising:
- a coupler branching off a portion of light input to an optical unit, the light input to the optical unit including amplified spontaneous emission (ASE);
an optical branching unit branching said portion into lights in four directions;
a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from the lights in four directions; and
a determination unit determining whether the light input to the optical unit includes signal light or only ASE, without signal light, based on the four polarization components extracted by the polarization component extraction unit.
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Abstract
According to an aspect of an embodiment, an apparatus includes an optical branching unit for branching an input signal light in four directions, a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from lights branched in four directions by the optical branching unit, and a determination unit determining input/non-input of the signal light based on the four polarization components extracted by the polarization component extraction unit.
11 Citations
20 Claims
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1. An apparatus, comprising:
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a coupler branching off a portion of light input to an optical unit, the light input to the optical unit including amplified spontaneous emission (ASE); an optical branching unit branching said portion into lights in four directions; a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from the lights in four directions; and a determination unit determining whether the light input to the optical unit includes signal light or only ASE, without signal light, based on the four polarization components extracted by the polarization component extraction unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method, comprising:
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branching a portion of light input to an optical unit, the light input to the optical unit including amplified spontaneous emission (ASE); branching said portion into lights in four directions; extracting four polarization components having mutually different polarization parameters from the lights in four directions; and determining whether the light input to the optical unit includes signal light or only ASE, without signal light, based on the extracted four polarization components. - View Dependent Claims (10, 11)
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12. The apparatus comprising:
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a coupler branching off a portion of light input to an optical unit; an optical branching unit branching said portion into lights in four directions; a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from the lights in four directions; a determination unit determining whether or not signal light is included in the light input to the optical unit based on the four polarization components extracted by the polarization component extraction unit; and a controller controlling the optical unit in accordance with the determination of whether or not signal light is included in the light input to the optical unit by the determination unit. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. The method comprising:
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branching a portion of light input to an optical unit; branching said portion into lights in four directions; extracting four polarization components having mutually different polarization parameters from the lights in four directions; determining whether or not signal light is included in the light input to the optical unit based on the extracted four polarization components; and controlling the optical unit in accordance with the determination of whether or not signal light is included in the light input to the optical unit. - View Dependent Claims (20)
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Specification