Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2005-02-01
2005-02-01
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
06850318
ABSTRACT:
An apparatus and method for measuring polarization mode dispersion (PMD) using a polarization mode dispersion measuring device, comprising an FSF laser generating frequency chirped light, an optical amplifier amplifying the frequency chirped light, an offset circuit, a λ/2 plate, a beam splitter, an analyzer retrieving polarization components measured from each light wave after propagating through the fast axis and the delay axis of the optical fiber under test, a lens, a photodetector detecting a light wave passed through the lens, and an RF spectrum analyzer observing a spectrum waveform of the light wave. The frequency chirped light, after propagating through the optical fiber under test and passing through the analyzer, is detected and the variation in beat frequency is measured to determine a PMD value.
REFERENCES:
patent: 5717489 (1998-02-01), Ozeki et al.
patent: 6144450 (2000-11-01), Jopson et al.
patent: 6229599 (2001-05-01), Galtarossa
patent: 6229606 (2001-05-01), Way et al.
patent: 61-047533 (1986-03-01), None
patent: 09-264814 (1997-10-01), None
patent: 2000-081374 (2000-03-01), None
Namihira, “ITU-T Polarization Mode Dispersion (PMD) Round Robin Measurements for Optical Fibers and Components,” KDD R&D No. 159 Mar. 1998, pp. 33-46.
Koichiro Nakamura et al., “A New Technique of Optical Ranging by a Frequency-Shifted Feedback Laser,” IEEE Photonics Technology Letters, IEEE Inc. New York, US, vol. 10, No. 12, Dec. 1998, pp. 1772-1774.
Mochizuki K et al., “Polarisation Mode Dispersion Measurements in Long Single Mode Fibres,” Electronics Letters, IEE Stevenage, GB, vol. 17, No. 4, Feb. 19, 1981, pp. 153-154.
Supplementary European Search Report for US Patent Application No. 10/182,697 dated Mar. 14, 2003.
Ito Hiromasa
Miyamoto Toshiyuki
Nakamura Koichiro
Yoshida Masato
Japan Science and Technology Agency
Neifeld IP Law PC
Nguyen Tu T.
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