Local loss test set

Details Local loss test set Local loss test set

G - Physics

01

M

G01M 11/02 (2006.01) G01M 11/00 (2006.01) G01N 21/84 (2006.01)

Patent

CA 2082231

Abstract of the Disclosure An apparatus for locally determining the attenuation of an optical signal across a fault in an optical fiber. The local loss test set includes a base unit which houses all of the system's electronic components, except for a photodetector which is located in a remote receiver unit. A remote transmitter unit is also provided; a light source is preferably housed in the base unit, and connected to the remote transmitter by an optical fiber. The remote transmitter utilizes microbending to inject the test signal, and the remote receiver similarly utilizes microbending to withdraw signals. A reference signal is captured from the fiber under test between the transmitter and the fault. A loss signal is captured from the opposite side of the fault, and compared by a processor to yield relative loss measurement (in decibels). The processor checks the loss against preset passing and failing thresholds. The light source is preferably modulated, and the receiver includes a bandpass filter tuned to the frequency of the modulator. A second transmitter may be used with a bidirectional receiver to further enhance the accuracy of the measurements.

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