METHOD AND APPARATUS FOR MEASURING DISTRIBUTION OF ZERO DISPERSION WAVELENGTH OF OPTICAL FIBER - Nippon Telegraph and Telephone Corporation

Title:

METHOD AND APPARATUS FOR MEASURING DISTRIBUTION OF ZERO DISPERSION WAVELENGTH OF OPTICAL FIBER

Document Type and Number:

Japanese Patent JP3248559

Kind Code:

B2

Abstract:

PURPOSE: To measure the distribution of zero dispersion wavelength in the longitudinal direction of an optical fiber by observing the backscattering waveform of a light pulse indicating the power distribution of the light pulse in the longitudinal direction of the optical fiber.
CONSTITUTION: In a light pulse tester 10, a light pulse is made incident on an optical fiber to be measured 6. A backscattering light is generated at each part in the fiber 6 when the light pulse propagates. In the tester 10, the backscattering light generated and returned from each part of the optical fiber 6 is split by a directional coupler 13 and detected by a high-speed photodetector 14. A waveform of the light is displayed at a display part 15. The backscattering light is continuously returned from each part during the propagation of the light pulse. The backscattering light from a further part takes a longer time to return to the entering end. Therefore, the waveform of the backscattering light expands more in comparison with the light pulse incident upon the fiber 6. A distribution of power of the light pulse in the longitudinal direction in the fiber 6 can be detected by observing the waveform. A zero dispersion wavelength of a part of the fiber 6 where a modulation instability is generated, is accordingly determined.

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Inventors:

west adult
Katsumi Iwatsuki
Kenichi Suzuki
Masatoshi Saruwatari

Application Number:

JP10976795A

Publication Date:

January 21, 2002

Filing Date:

May 08, 1995

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

G01M11/02; G02B6/00; (IPC1-7): G01M11/02; G02B6/00

Domestic Patent References:

JP5180729A
JP2281122A
JP63309833A
JP6331495A
JP2251729A
JP6341924A

Attorney, Agent or Firm:

Yoshikazu Tani (1 person outside)

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