Implementation of coded optical time-domain reflectometry
OwnerLeif Johanssoninventor
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Abstract
An implementation of coded time-domain reflectometry that can be incorporated in a transmitter as a built-in test function is disclosed. A sequence of a signal that is being transmitted is captured, delayed and used for correlation to a received reflected signal from the transmission medium. A correlation signal is obtained if the delay value of the captured signal sequence corresponds to the roundtrip delay from the transmitter to a reflection point of the medium. Based to the relation between delay values and the strength of the correlated signal, the magnitude of reflective points throughout the transmission medium can be evaluated. In the preferred embodiment, the transmitter is an optical transmitter, and the transmission medium is optical fiber.
Claims8
An optical transmitter of information-carrying signals wherein simultaneously as information is transmitted from the first optical transmitter to a remote receiver through a given transmission medium, a capability to measure reflections in the transmission path is obtained by the capture of a sequence of the transmitted signal that is used to correlate with a reflected signal.
Dependencies are inferred from the claim text.