Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1988-01-25
1990-05-01
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356243, G01N 2100
Patent
active
049213474
ABSTRACT:
A method and apparatus for calibrating absolute and relative measurements of modulation and/or demodulation transfer characteristics of electro-optical and opto-electrical devices during setup of a lightwave component measurement system for characterizing performance of fiber optic systems and associated components. The lightwave component measurement system calibrated in accordance with the method of the invention provides the capability to measure the optical, electrical, and, especially, the electro-optical (E/O) and opto-electrical (O/E) components with specified measurement performance. In accordance with the calibration method of the invention, when the lightwave component measurement system is used to characterize an E/O or O/E device, an initial calibration reference is established based on the known characteristics of a lightwave source and lightwave receiver included in the lightwave component measurement system. A measurement is then performed on the calibration reference (the lightwave source or the lightwave receiver), and error correction data are produced and stored in a lightwave component analyzer included in the lightwave component measurement system. The modulation (or demodulation) transfer characteristics are preferably given in terms of the responsivity magnitude and phase versus modulation frequency. A device under test (DUT) then is measured when it replaces its calibrated counterpart in the measurement setup. The lightwave component analyzer uses the error correction data when the E/O or O/E characteristics of the DUT are measured.
REFERENCES:
patent: 4703433 (1987-10-01), Sharrit
"Frequency Domain Optical Reflectometer", MacDonald, Applied Optics, 5-1981, pp. 1840-1844.
Hart Michael G.
Vifian Hugo
Wong Roger W.
Hewlett--Packard Company
McGraw Vincent P.
Milks, III William C.
Turner S. A.
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