Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-01-04
1990-11-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 731, H01J 516, H01J 4014
Patent
active
049688804
ABSTRACT:
In a method and a corresponding apparatus for performing optical time domain reflectometry predetermined time sequences of light signals (A', B') are injected into an optical fiber and the signals backscattered from the fiber are correlated with the injected sequences. The injected time sequences are selected according to a specific code such that after each element in the code represented by "1" or "-1", a predetermined number of elements represented by "0" is provided. Depending on the number of inserted "0"s after each "1" or "-1", sidelobes in the correlation product appear at certain predictable positions. By choosing the numbers of inserted "0"s differently for different injections, the resulting sidelobes appear at different positions in the corresponding correlation products. From the correlation products of such different injections, a composite fiber response can be derived wherein sidelobes are substantially eliminated. The codes used can be derived, for example, from Golay complementary codes.
REFERENCES:
patent: 4743753 (1988-05-01), Cheng et al.
patent: 4812038 (1989-03-01), Nazarathy et al.
Allen Stephone B.
Hewlett--Packard Company
Nelms David C.
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