Analogue maintenance detection
AssigneeNortel Networks Limited
InventorsDuncan Forbes, Giulio Giovannini
Life of this patent
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Abstract
Methods and apparatus are described for processing an optical signal. The optical signal comprises at least a first channel signal at a first wavelength modulated by a first frequency, a second channel signal at a second wavelength modulated by a second frequency, and a third channel signal at a third wavelength modulated by a third frequency. The method includes receiving the optical signal, and splitting the received optical signal into at least two optical bands, a first optical band comprising the first and second channel signals, and a second optical band comprising the third channel signal. A first electrical signal is formed, proportional to the total optical power of the first optical band.
Claims11
An apparatus for processing an optical signal, the optical signal comprising at least a first channel signal at a first wavelength modulated by a first frequency, a second channel signal at a second wavelength modulated by a second frequency, and a third channel signal at a third wavelength modulated by a third frequency, the apparatus comprising:
- an input for receiving the optical signal;
- a splitter arranged to split the received optical signal into at least two optical bands, a first optical band comprising at least the first and second channel signals, and a second optical band comprising at least the third channel signal;
- and
- a first photo detector arranged to receive the first optical band, and to output a first electrical signal proportional to the total optical power of the first optical band.
A method of processing an optical signal, the optical signal comprising at least a first channel signal at a first wavelength modulated by a first frequency, and a second channel signal at a second wavelength modulated by a second frequency, and a third channel signal at a third wavelength modulated by a third frequency, the method comprising the steps of:
- receiving the optical signal;
- splitting the received optical signal into at least two optical bands, a first optical band comprising at least the first and second channel signals, and a second optical band comprising the third channel signal;
- and
- producing a first electrical signal proportional to the total optical power of the first optical band.
Dependencies are inferred from the claim text.