DISTORTION MEASURING APPARATUS, METHOD, PROGRAM, AND RECORDING MEDIUM
First Claim
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1. A distortion measuring device comprising:
- a Brillouin scattered light spectrum recorder that records a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
an incident light spectrum recorder that records a spectrum of the incident light;
a Brillouin gain spectrum deriver that derives a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the incident light;
a peak frequency deriver that derives a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
a distortion deriver that derives a distortion of the device under test based on the derived peak frequency.
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Abstract
A distortion of a device under test (such as an optical fiber) can be precisely measured. There is provided a distortion measuring device including a signal processing unit 32 having a Brillouin scattered light spectrum recording unit 322a which records a spectrum of Brillouin scattered light generated in an optical fiber as a result of supplying incident light, a Rayleigh scattered light spectrum recording unit 322b which records a spectrum of Rayleigh scattered light generated in the optical fiber as a result of supplying the incident light, a deconvolution unit 324 which derives a Brillouin gain spectrum of the optical fiber based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the incident light, a peak frequency deriving unit 326 which derives a peak frequency at which the derived Brillouin gain spectrum takes the maximum value, and a distortion deriving unit 328 which derives a distortion of the optical fiber based on the derived peak frequency.
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Citations
9 Claims
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1. A distortion measuring device comprising:
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a Brillouin scattered light spectrum recorder that records a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
an incident light spectrum recorder that records a spectrum of the incident light;
a Brillouin gain spectrum deriver that derives a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the incident light;
a peak frequency deriver that derives a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
a distortion deriver that derives a distortion of the device under test based on the derived peak frequency. - View Dependent Claims (2, 4, 5)
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3. A distortion measuring device comprising:
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a Brillouin scattered light spectrum recorder that records a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
a Rayleigh scattered light spectrum recorder that records a spectrum of Rayleigh scattered light generated in the device under test as a result of supplying the incident light;
a Brillouin gain spectrum deriver that derives a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the Rayleigh scattered light;
a peak frequency deriver that derives a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
a distortion deriver that derives a distortion of the device under test based on the derived peak frequency.
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6. A distortion measuring method comprising:
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recording step of recording a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
recording step of recording a spectrum of the incident light;
deriving step of deriving a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the incident light;
deriving a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
deriving a distortion of the device under test based on the derived peak frequency.
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7. A computer readable medium having a program of instructions for execution by a computer to perform a distortion measuring process, the computer readable medium comprising:
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a Brillouin scattered light spectrum recording segment for recording a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
an incident light spectrum recording code segment for recording a spectrum of the incident light;
a Brillouin gain spectrum deriving code segment for deriving a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the incident light;
a peak frequency deriving code segment for deriving a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
a distortion deriving code segment for deriving a distortion of the device under test based on the derived peak frequency.
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8. A distortion measuring method comprising:
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recording step of recording a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
recording step of recording a spectrum of Rayleigh scattered light generated in the device under test as a result of supplying the incident light;
deriving a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the Rayleigh scattered light;
deriving a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
deriving a distortion of the device under test based on the derived peak frequency.
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9. A computer-readable medium having a program of instructions for execution by a computer to perform a distortion measuring process, the computer readable medium comprising:
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a Brillouin scattered light spectrum recording code segment for recording a spectrum of Brillouin scattered light generated in a device under test as a result of supplying incident light;
a Rayleigh scattered light spectrum recording code segment for recording a spectrum of Rayleigh scattered light generated in a device under test as a result of supplying the incident light;
a Brillouin gain spectrum deriving code segment for deriving a Brillouin gain spectrum of the device under test based on the recorded spectrum of the Brillouin scattered light and the recorded spectrum of the Rayleigh scattered light;
a peak frequency deriving code segment for deriving a peak frequency at which the derived Brillouin gain spectrum takes the maximum value; and
a distortion deriving code segment for deriving a distortion of the device under test based on the derived peak frequency.
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Specification
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Current AssigneeAdvantest Corporation
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Original AssigneeAdvantest Corporation
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InventorsUkita, Junichi
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Application NumberUS11/567,942Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current356/73.100CPC Class CodesG01M 11/3109 Reflectometers detecting th...G01M 11/319 Reflectometers using stimul...
