Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1990-06-21
1991-11-26
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2188
Patent
active
050678108
ABSTRACT:
An instrument such as an optical time domain reflectometer (OTDR) in which a single source of light such as a laser shares N (N.gtoreq.2) optical fibers. The pulse of light from the laser is split into N pulses each having essentially the same power. The N pulses are input to an associated one of the N fibers. The instrument has N detectors each associated with one of the fibers. Two or more of the instruments in which each single laser shares two fibers can be connected in tandem with one or more optical fibers. The light pulses from each of the instrument's single lasers are split into two pulses each having essentially the same power. The light pulses from each of the instruments which propagate in opposite directions on the same fiber are synchronized to each other so that a light pulse from one of the instruments which propagates in one direction on that fiber does not interfere with the light pulse from another of the instruments which propagates in the opposite direction on that same fiber and also does not interfere with the backscatter from that another light pulse on that same fiber.
REFERENCES:
patent: 4875772 (1989-10-01), Gentile
No affiliations
McGraw Vincent P.
Reliance Comm/Tec Corporation
Rickin Michael M.
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