Optical waveguides – With optical coupler – Particular coupling function
Reexamination Certificate
2005-02-15
2005-02-15
Lee, Diane I. (Department: 2876)
Optical waveguides
With optical coupler
Particular coupling function
Reexamination Certificate
active
06856723
ABSTRACT:
A group velocity dispersion measuring device capable of measuring group velocity dispersion (GVD) with a simple configuration and in a short time, comprising an FSF laser (FSFL) (2) for generating frequency chirp light, an optical amplifier (AMP) (3) for amplifying the frequency chirp light, an optical coupler (4), a circulator (5) for branch-controlling optical signals, a photodetector (6) for receiving a ray of light before and after its propagation through an optical fiber (1) to be measured, and an RF spectrum analyzer (RFSA) (7) for observing an optical spectrum waveform. Beat signals generated between chirp lights before and after the propagation, through the optical fiber (1) to be measured, of frequency chirp light emitted from the FSF laser (2) are alternately observed to calculate a GVD value from frequency differences between these beat signals.
REFERENCES:
patent: 5717489 (1998-02-01), Ozeki et al.
patent: 5982530 (1999-11-01), Akiyama et al.
patent: 5995228 (1999-11-01), Otani et al.
patent: 6266145 (2001-07-01), Lee et al.
patent: 0 937 973 (1999-02-01), None
patent: 04-285836 (1992-10-01), None
patent: 11-237312 (1999-08-01), None
patent: 2000-081374 (2000-03-01), None
patent: 2000193558 (2000-07-01), None
Yoshida, M. “A new method for measurement of group velocity dispersion of optical fibers by using a frequency-shifted feedback fiber laser”, IEEE Photonics Technology Letters, vol. 13, No. 3, Mar. 2001, pp. 227-229.*
Yoshida, M. et al., “Effect of group velocity dispersion of optical fiber on optical frequency domain reflectometry,” Technical Digest, Summaries of Papers Presented at the Conference on Lasers and Electro-Optics, Postconference Edition, Cleo '99, Conference on Lasers and Electro-Optics (IEEE Cal. No. 99CH37013), pp. 388-389, XP002233307 1999, Washington, DC, Opt. Soc. America.
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.
Ito Hiromasa
Nakamura Koichiro
Yoshida Masato
Japan Science and Technology Agency
Lee Diane I.
Neifeld IP Law PC
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