Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1992-01-21
1994-04-19
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2159
Patent
active
053050789
ABSTRACT:
Attenuation of an optical fiber is measured by transmitting an optical signal having a predetermined wavelength to the fiber, and FSK modulating the optical signal with information identifying the wavelength and transmitted power of the optical signal. At a receiver, the optical signal is detected and the information is recovered by demodulation. Wavelength-dependent sensitivity information for the detector is read from a store in dependence upon the wavelength information and used to control the gain of an amplifier for amplifying a subsequently transmitted continuous wave optical signal used for attenuation measurement. The received power level of this optical signal is converted into a digital value and used with the transmitted power information to determine the fiber attenuation at the predetermined wavelength.
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patent: 4737027 (1988-04-01), Maeda
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patent: 4901003 (1990-02-01), Clegg
EXFO Electro-optical Engineering Inc.
McGraw Vincent P.
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