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Simple and highly accurate technique for time delay measurement in optical fibers by free-running laser configuration

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Abstract

A novel and simple technique for the measurement of time delay in the optical fiber by a free-running laser is proposed and demonstrated. The fiber to be measured was spliced to an erbium-doped fiber so as to form a ring-cavity laser. The mode beating frequency of the laser was measured to determine the round-trip time delay. This precise and efficient technique has an accuracy of 108 for a fiber length of 100km and of 106 for a several-meters-long one.

© 2008 Optical Society of America

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