Automatic mask trigger for an optical time domain reflectometer

Details Automatic mask trigger for an optical time domain reflectometer Automatic mask trigger for an optical time domain reflectometer

1989-07-14

1991-02-05

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2101, G01N 2188

Patent

active

049899716

ABSTRACT:
An automatic trigger mask for an optical time domain reflectometer inhibits high optical level pulses in a received optical signal from saturating an optical detector in a receiver. A portion of the received optical signal is compared with a threshold signal derived from the output of the receiver. If the portion of the received optical signal exceeds the threshold signal, then a control signal is generated to open an optical switch in the optical path to the receiver so that the high optical level pulses are inhibited from reaching the optical detector.

REFERENCES:
patent: H686 (1989-10-01), Mullins
patent: 4173412 (1979-11-01), Ramsay et al.
patent: 4543477 (1985-09-01), Doi et al.
patent: 4730113 (1988-03-01), Edwards et al.

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