Power tilt compensation using automatic power balance control
AssigneeFujitsu Limited
InventorsCechan Tian, Susumu Kinoshita
Life of this patent
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Abstract
A method for correcting power tilt in an optical signal includes tapping off a representative portion of an optical signal and separating the representative portion into a first signal and a second signal. The first signal includes a first wavelength band and the second signal includes a second wavelength band different from the first wavelength band, wherein each wavelength band includes more than one channel. The method also includes detecting a power level of the first signal, detecting a power level of the second signal, and comparing the power levels of the first and second signals. The method further includes determining a power tilt for the optical signal based on the comparison and adjusting an amplifier gain based on the power tilt.
Claims20
A method for correcting power tilt in an optical signal, comprising:
- tapping off a representative portion of an optical signal;
- separating the representative portion into a first signal and a second signal, the first signal comprising a first wavelength band and the second signal comprising a second wavelength band different from the first wavelength band, wherein each wavelength band comprises more than one channel;
- detecting a power level of the first signal;
- detecting a power level of the second signal;
- comparing the power levels of the first and second signals;
- determining a power tilt for the optical signal based on the comparison;
- and
- adjusting an amplifier gain based on the power tilt.
A device, comprising:
- an optical tap operable to extract a representative portion of an optical signal;
- a splitter operable separate the representative portion of the optical signal into a first signal and a second signal, the first signal comprising a first wavelength band and the second signal comprising a second wavelength band different from the first wavelength band, wherein each wavelength band comprises more than one channel;
- a first photodetector operable to detect a power level for the first signal;
- a second photodetector operable to detect a power level for the second signal;
- and
- a processor operable to:
- compare the power levels for the first and second signals;
- determine a power tilt for the optical signal based on the comparison;
- and
- adjust an amplifier gain for the signal based on the power tilt.
A system, comprising:
- means for tapping off a representative portion of an optical signal;
- means for separating the representative portion into a first signal and a second signal, the first signal comprising a first wavelength band and a second signal comprising a second wavelength band different from the first wavelength band, wherein each wavelength band comprises more than one channel;
- means for detecting a power level of the first signal;
- means for detecting a power level of the second signal;
- means for comparing the power levels of the first and second signals;
- means for determining a power tilt for the optical signal based on the comparison;
- and
- adjusting an amplifier gain based on the power tilt.
Dependencies are inferred from the claim text.