Optical fiber propagation time measurement

Details Optical fiber propagation time measurement Optical fiber propagation time measurement

2006-01-24

2006-01-24

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

06989892

ABSTRACT:
An optical fiber propagation time measurement circuit. A light pulse is iteratively transmitted into a near end of a fiber under test (FUT) at a predetermined frequency and detected at a far end of the FUT after a propagation time. A repetitive propagation signal having a predetermined amplitude and a width corresponding the propagation time is developed by detection circuitry. The d.c. voltage average of the propagation signal is determined and used to compute the propagation time since the ratio of the d.c. voltage average to the predetermined amplitude is equal to the ratio of the propagation time to the period of the light pulses.

REFERENCES:
patent: 4871254 (1989-10-01), Lefevre et al.
patent: 5903691 (1999-05-01), Wisseman et al.
patent: 6256321 (2001-07-01), Kobayashi

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