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US 8,620,155 B2Granted
Optical signal to noise monitor
AssigneeThe University of Sydney
InventorsBenjamin John Eggleton, Mark Pelusi, Timothy Iredale
Life of this patent
Estimating the term…
Abstract
An optical noise monitoring method and monitor, the monitor comprising an optical transmitter for receiving at least a portion of an optical signal, a device arranged to extract a reflected optical signal comprising a portion of the optical signal back-reflected by stimulated Brillouin scattering in the optical transmitter, and a photodetector for receiving the reflected optical signal. The optical transmitter can scatter the optical signal by stimulated Brillouin scattering.
Claims20
An optical noise monitor for monitoring noise in an optical signal, comprising:
- an optical transmitter for receiving at least a portion of said optical signal;
- a device arranged to extract a reflected optical signal comprising a portion of said optical signal back-reflected by stimulated Brillouin scattering in said optical transmitter;
- and
- a photodetector for receiving said reflected optical signal;
- wherein said optical transmitter scatters said optical signal by stimulated Brillouin scattering;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and a strength of said reflected optical signal received by said photodetector is inversely proportional to a level of noise in said optical signal;
- and
- wherein said monitor is configured (i) to identify that noise is present in said optical signal based on a reduction in the strength of said reflected optical signal received by said photodetector, or (ii) to determine said level of noise in said optical signal based on the strength of said reflected optical signal received by said photodetector.
5 more elements
An optical noise monitor for monitoring noise in an optical signal, comprising:
- an optical transmitter for receiving at least a portion of said optical signal;
- a photodetector for monitoring light transmitted by said optical transmitter;
- wherein said optical transmitter scatters said optical signal by stimulated Brillouin scattering;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and a strength of reflection of the optical signal is inversely proportional to a level of noise in the optical signal so loss in said light transmitted by said optical transmitter received by said photodetector is indicative of a level of noise in said optical signal;
- and
- wherein said monitor is configured (i) to identify that noise is present in said optical signal based on an increase in the strength of said light transmitted by said optical transmitter and received by said photodetector, or (ii) to determine said level of noise in said optical signal based on a strength of said light transmitted by said optical transmitter and received by said photodetector.
3 more elements
A method of monitoring optical noise, comprising:
- directing an optical signal into an optical transmitter that scatters said optical signal by stimulated Brillouin scattering;
- monitoring a reflected optical signal comprising a portion of said optical signal back-reflected by stimulated Brillouin scattering in said optical transmitter;
- and
- identifying that noise is present in said optical signal based on a reduction in the strength of said reflected optical signal or determining a level of noise in said optical signal based on said strength of said reflected optical signal;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and said strength of said reflected optical signal is inversely proportional to said level of noise in said optical signal.
2 more elements
A method of monitoring optical noise, comprising:
- directing an optical signal into an optical transmitter that scatters said optical signal by stimulated Brillouin scattering;
- monitoring a transmitted optical signal comprising a portion of said optical signal transmitted by said optical transmitter;
- and
- identifying that noise is present in said optical signal based on an increase in a strength of said light transmitted by said optical transmitter, or determining a level of noise in said optical signal based on the strength of said light transmitted by said optical transmitter;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and a strength of reflection of the optical signal is inversely proportional to a level of noise in the optical signal so loss in said strength of said light transmitted by said optical transmitter is indicative of said level of noise in said optical signal.
2 more elements
An optical noise monitor for monitoring noise in an optical signal, comprising:
- an optical transmission medium for receiving at least a portion of said optical signal;
- a device arranged to extract a reflected optical signal comprising a portion of said optical signal back-reflected by stimulated Brillouin scattering in said optical transmission medium;
- and
- a photodetector for receiving said reflected optical signal;
- wherein said optical transmission medium scatters said optical signal by stimulated Brillouin scattering;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and a strength of said reflected optical signal received by said photodetector is inversely proportional to a level of noise in said optical signal;
- and
- wherein said monitor is configured (i) to identify that noise is present in said optical signal based on a reduction in the strength of said reflected optical signal received by said photodetector, or (ii) to determine said level of noise in said optical signal based on the strength of said reflected optical signal received by said photodetector.
5 more elements
An optical noise monitor for monitoring noise in an optical signal, comprising:
- an optical transmission medium for receiving at least a portion of said optical signal;
- a photodetector for monitoring light transmitted by said optical transmission medium;
- wherein said optical transmission medium can scatters said optical signal by stimulated Brillouin scattering;
- wherein, when the noise in the optical signal is above a Brillouin threshold, efficiency of power transfer to a Stokes wave is reduced and a strength of reflection of the optical signal is inversely proportional to a level of noise in the optical signal so loss in said light transmitted by said optical transmission medium received by said photodetector is indicative of a level of noise in said optical signal;
- and
- wherein said monitor is configured (i) to identify that noise is present in said optical signal based on an increase in the strength of said light transmitted by said optical transmission medium and received by said photodetector, or (ii) to determine said level of noise in said optical signal based on the a strength of said light transmitted by said optical transmission medium and received by said photodetector.
3 more elements
Dependencies are inferred from the claim text.