Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1997-06-16
1998-10-20
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2184
Patent
active
058254790
ABSTRACT:
A method and apparatus for distinguishing between fiber types having different dispersion characteristics and arbitrary lengths is disclosed. An optical pulse having a predetermined wavelength and predetermined time width is propagated through the fiber and then detected. The optical pulse after being fed through the fiber is measured at different wavelengths along with the length of the fiber. If the measured pulse is within a predetermined amount at the determined length, then fiber under test corresponds to a type having a first dispersion characteristic. If it is determined that the measured pulse is within a second amount, then the fiber under test corresponds to a type having a second dispersion characteristic. Alternately one or more optical pulses of arbitrary width each having different wavelengths after being propagated through the fiber under test is fed through a plurality of filters and detected. The wavelength of the pulse of the smallest time duration is detected and a corresponding dispersion characteristic is then indicated.
REFERENCES:
patent: 4710022 (1987-12-01), Soeda et al.
Anemogiannis Emmanuel
Thompson Leo J.
Marvin William A.
McGraw Vincent P.
Stewart Steven C.
VeriFiber Technologies, Inc.
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