19 November 1985 Interferometric Measurement Of Chromatic Dispersion In Single Mode Fibers
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An interferometer with a short length of fiber in one arm and a moving mirror in the other, with LED illumination, is described. The photocurrent generated in a detector viewing the output of the interferometer as the mirror moves contains an ac component whose instantaneous frequency is proportional to the optical frequency of one spectral component of the power spectrum of the source. This frequency is a unique function of the instantaneous position of the moving mirror, a function whose inverse yields the group delay as a function of frequency for the fiber under test. Simple counter-timer circuits are used to measure the instantaneous frequency of the signal as a function of mirror position and are monitored by counting reference fringes generated by HeNe radiation simultaneously traversing the interferometer. The HeNe signal provides an accurate measure of relative delay without the imposition of special requirement (e.g., uniform velocity) on the mirror motion, as well as a frequency calibration for the instantaneous frequency of the LED radiation being observed.
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J. J. Burke, J. J. Burke, N. Kosa, N. Kosa, "Interferometric Measurement Of Chromatic Dispersion In Single Mode Fibers", Proc. SPIE 0559, Fiber Optics: Short-Haul and Long-Haul Measurements and Applications III, (19 November 1985); doi: 10.1117/12.949584; https://doi.org/10.1117/12.949584

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