Correction technique for coded sequence otdr
AssigneeEXFO Inc.
InventorsMichel LECLERC, Sammy NOEL PARISE
Life of this patent
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Abstract
There are provided coded-sequence OTDR methods and devices which diminish or erase artefacts created in the OTDR trace by performing multiple coded-sequence OTDR acquisitions with mutually different inter-pulse intervals so as to change the positions of the artefacts in the OTDR traces derived from these OTDR acquisitions and combining the multiple OTDR traces to reconstruct a reconstructed OTDR trace.
Claims20
A coded-sequence OTDR method for characterizing an optical device under test, the OTDR method comprising:
- performing a plurality of coded-sequence OTDR acquisitions toward the optical device under test, wherein each OTDR acquisition is performed by propagating in the optical device under test, at least one pulsed test signal, each pulsed test signal comprising a series of light pulses in accordance with an inter-pulse interval and a known coded sequence and, for each pulsed test signal, detecting a return light signal from the optical device so as to obtain a corresponding acquisition signal;
- wherein said plurality of coded-sequence OTDR acquisitions are performed with mutually different inter-pulse intervals of their corresponding pulsed test signal;
- from each acquisition signal or intermediate signals derived from acquisition signals, generating an OTDR trace representing backscattered and reflected light as a function of distance in the optical device under test;
- and
- combining the plurality of OTDR traces to obtain a reconstructed OTDR trace.
A coded-sequence OTDR device for characterizing an optical device under test, the OTDR device comprising:
- an OTDR acquisition device connectable toward an end of the optical device for performing plurality of coded-sequence OTDR acquisitions toward the optical device, wherein each OTDR acquisition is performed by propagating in the optical device under test, at least one pulsed test signal, each pulsed test signal comprising a series of light pulses in accordance with a pulse rate and a known coded sequence and, for each pulsed test signal, detecting a return light signal from the optical device so as to obtain a corresponding acquisition signal;
- wherein said plurality of coded-sequence OTDR acquisitions are performed with mutually different inter-pulse intervals of their corresponding pulsed test signal;
- and
- a processing unit receiving the acquisition signal and configured to perform the steps of:
- from each acquisition signal or intermediate signals derived from acquisition signals, generating an OTDR trace representing backscattered and reflected light as a function of distance in the optical device under test;
- and
- combining the plurality of OTDR traces to obtain a reconstructed OTDR trace.
A non-transitory computer-readable storage medium comprising instructions that, when executed, cause a processor to perform the steps of:
- receiving data derived from at least one OTDR acquisition performed toward an optical device under test, wherein each OTDR acquisition is performed by propagating in the optical device under test, at least one pulsed test signal each pulsed test signal comprising a series of light pulses in accordance with a inter-pulse interval and a known coded sequence and, for each pulsed test signal, detecting a return light signal from the optical device so as to obtain a corresponding acquisition signal;
- wherein said plurality of coded-sequence OTDR acquisitions are performed with mutually different inter-pulse intervals of their corresponding pulsed test signal;
- and
- from each acquisition signal or intermediate signals derived from acquisition signals, generating an OTDR trace representing backscattered and reflected light as a function of distance in the optical device under test;
- and
- combining the plurality of OTDR traces to obtain a reconstructed OTDR trace.
Dependencies are inferred from the claim text.