Title :
An optical time-domain reflectometer with low-power InGaAsP diode laser
Author :
Sudbø, Aasmund Sv
Author_Institution :
Norwegian Telecommunications Administration Research Establishment, Kjeller, Norway
fDate :
12/1/1983 12:00:00 AM
Abstract :
An optical time-domain reflectometer (OTDR) suited for operation with low-power (of the order of 1-mW peak power) InGaAsP lasers is described. To launch maximum average power into the fiber, the laser is modulated by a pseudonoise binary sequence, and the back-scattered signal is averaged and then analyzed by a microcomputer. Initial tests of the reflectometer with a germanium avalanche photodiode (Ge APD) detector demonstrate backscattering signal levels at 1300 nm from 50-μm core diameter graded-index fibers of more than 15 dB above the system noise.
Keywords :
Gallium materials/lasers; Optical fiber measurements; Optical reflection; Time domain measurements; Binary sequences; Diode lasers; Fiber lasers; Microcomputers; Optical fiber testing; Optical modulation; Power lasers; Signal analysis; System testing; Time domain analysis;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.1983.1072158
