Method and device for in-band optical performance monitoring
AssigneeNational ICT Australia Limited
InventorsTrevor Anderson, Sarah Dods
Life of this patent
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Abstract
A method and device for determining in-band noise of an optical signal. The optical signal is split to produce two optical signal components, of distinct polarisation, such that the respective noise component in each signal component is uncorrelated. The optical signal components are converted to the electrical domain to produce electrical signal components. The signal component powers are equalised either in the optical domain or the electrical domain. The equalised electrical signal components are then subtracted together to cancel the correlated portions of the signal components (e.g. the data signal), such that only uncorrelated signal components (e.g. noise) are output for measurement.
Claims24
A method of determining in-band noise of an optical signal, the method comprising:
- splitting the optical signal to produce a first optical signal component and a second optical signal component of distinct polarisation to the first optical signal component;
- converting the first optical signal component to the electrical domain to produce a first electrical signal component;
- converting the second optical signal component to the electrical domain to produce a second electrical signal component;
- equalising a signal power of the first electrical signal component and a signal power of the second electrical signal component;
- and
- subtracting the equalised first electrical signal component and second electrical signal component.
A device for determining in-band noise of an optical signal, the device comprising:
- a splitter for splitting the optical signal to produce a first optical signal component and a second optical signal component of distinct polarisation to the first optical signal component;
- a first photodetector for converting the first optical signal component to the electrical domain to produce a first electrical signal component;
- a second photodetector for converting the second optical signal component to the electrical domain to produce a second electrical signal component;
- means for equalising a signal power of the first electrical signal component and a signal power of the second electrical signal component;
- and
- a combiner for subtracting the equalised first electrical signal component and second electrical signal component.
Dependencies are inferred from the claim text.