Signal averaging for optical time domain relectometers

Details Signal averaging for optical time domain relectometers Signal averaging for optical time domain relectometers

1988-12-16

1990-05-22

Lall, Parshotam S.

Boots, shoes, and leggings

356 731, G01M 1100

Patent

active

049282328

ABSTRACT:
Means for digitizing and averaging the signals in an optical time domain reflectometer are disclosed in which a comparator is used to output a 1 or 0 into an arbitrarily large number of successive time-bins. In each comparator choice, the analog voltage signal from the OTDR receiver is compared to a selected analog voltage value. The selected value is chosen randomly from the range of available signals in the interval of interest; and each such valve is used to provide a comparator input into every time-bin during one waveform recovery.
Each comparator output signal (1 or 0) is directed to a separate time-bin (counter), representing the desired time interval (resolution). Subsequent comparator output signals are added to each time bin. The waveform recovery runs are repeated until an acceptable signal-to-noise result is achieved. Each waveform run uses a different voltage for comparison to the receiver voltage. Such comparison voltages may be selected by a random generator; or an ordered series of comparison voltages may be used.

REFERENCES:
patent: 4812038 (1989-03-01), Nazarathy et al.

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