Instrument measuring chromatic dispersion in optical fibers

Details Instrument measuring chromatic dispersion in optical fibers Instrument measuring chromatic dispersion in optical fibers

2005-06-28

2005-06-28

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

06912046

ABSTRACT:
An instrument for measuring chromatic dispersion in optical fibers. The instrument comprises two independent modules, an optical source (2′) and a receiver (4′). The optical source (2′) comprises two pulse producing circuits: one driving a laser (35), which will be used as a timing reference, and the second driving a light emitting diode (LED)(34), emitting a short light pulse with a broad spectrum. The receiver (4′) comprises a wavelength-selection element (46), which filters one or several wavelengths out of the LED spectrum, a photodetector (43) for detection of the laser pulse, a photon-counting detector (41) for detection of the filtered LED pulses, and a high-resolution timing circuit (42) for measuring the time delay between the laser pulse and the LED pulse. A preferred embodiment includes the wavelength-selection element (46) which is a series of Bragg gratings, thus selecting several fixed wavelengths.

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