Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2009-07-29
2011-10-18
Connolly, Patrick J (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
C356S073100, C356S451000
Reexamination Certificate
active
08040523
ABSTRACT:
The present invention relates to a measurement method of the chromatic dispersion of an optical waveguide using an optical interferometer with a broadband multi-wavelength light source and an optical spectrum analyzing apparatus, wherein one arm, called “reference arm” of the interferometer's two arms has an adjustable air spacing and the other arm, called “sample arm” can contain said optical waveguide to be measured, and including the following measurement and analysis steps: measuring interference spectra of the optical beam output exiting from the said interferometer with an optical spectrum analyzing apparatus when said optical waveguide is connected to said sample arm, and when said optical waveguide is not connected to said sample arm respectively; by adjusting the reference arm length for appearance of clear interference patterns; converting the wavelength-domain interference spectra into frequency-domain interference spectra and calculating phase difference values of the interference peaks of one of the spectra from a predetermined reference peak as a function of the frequency change by counting the interference peak (or valley) points; finding a Taylor series curve fit function for each set of the phase difference value data corresponding to each of the two interference spectra; and calculating a chromatic dispersion coefficient of the optical waveguide by using the coefficients of the Taylor series curve fit functions.
REFERENCES:
patent: 5227623 (1993-07-01), Heffner
patent: 6882410 (2005-04-01), Asahina et al.
patent: 6943871 (2005-09-01), Abedin
patent: 7256876 (2007-08-01), Boroditsky et al.
patent: 7369773 (2008-05-01), Weiner
patent: 7414711 (2008-08-01), Boroditsky et al.
patent: 7689125 (2010-03-01), Weiner
patent: 7773207 (2010-08-01), Boroditsky et al.
patent: 2004/0234186 (2004-11-01), Nelson
patent: 2009/0196477 (2009-08-01), Cense et al.
Lee et al., “Versatile chromatic dispersion measurement of a single mode fiber using spectral white light interferometry,” Optics Express, Nov. 27, 2006, vol. 14, No. 24, pp. 11608-11615.
Lee et al., “Spectrum-sliced Fourier-domain low-coherence interferometry for measuring the chromatic dispersion of an optical fiber,” Applied Optics, Oct. 10, 2007, vol. 46, No. 29, pp. 7289-7296.
Cohen et al., “Comparison of Single-Mode Fiber Dispersion Measurement Techniques,” Journal of Lightwave Technology, Oct. 1985, vol. LT-3, No. 5, pp. 958-966.
Shang, “Chromatic Dispersion Measurement by White-Light Interferometry on Metre-Length Single-Mode Optical Fibres,” Electronics Letters, Aug. 20, 1981, vol. 17, No. 17, pp. 603-605.
Kim Kyong Hon
Kim Seung-hwan
Lee Elhang
Lee Seounghun
Connolly Patrick J
Drinker Biddle & Reath LLP
INHA-Industry Partnership Institute
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