Optical amplifying device, gain control method, optical transmission device, and gain control device
AssigneeFujitsu Limited
InventorTomoaki Takeyama
Life of this patent
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Abstract
An apparatus includes: an optical amplifier configured to perform optical amplification for gain by controlling so as to be a target gain; a correction power calculator configured to calculate, in response to amplified spontaneous emission light input to the optical amplifier, correction power corresponding to an amount of gain depression in a bandwidth in which spectral hole-burning occurs in the optical amplifier; and a gain controller configured to calculate, using the correction power calculated in the correction power calculator, a gain for controlling the optical amplification performed in the optical amplifier and perform, using the calculated gain, a control operation so that the gain of the optical amplification becomes the target gain.
Claims14
An optical amplifying device comprising:
- an optical amplifier configured to perform optical amplification for gain by controlling so as to be a target gain;
- a correction power calculator configured to calculate, in response to amplified spontaneous emission light input to the optical amplifier, correction power corresponding to an amount of gain depression in a bandwidth in which spectral hole-burning occurs in the optical amplifier;
- and
- a gain controller configured to calculate, using the correction power calculated in the correction power calculator, a gain for controlling the optical amplification performed in the optical amplifier and perform, using the calculated gain, a control operation so that the gain of the optical amplification becomes the target gain.
A gain control method for an optical amplifying device that performs a control operation in which optical amplification is performed at a target gain, the gain control method comprising:
- calculating correction power, based on power of amplified spontaneous emission light included in input light to an amplifier, an amount of gain depression in a bandwidth in which spectral hole-burning occurs in the optical amplifier, and power of amplified spontaneous emission light that occurs in the amplifier when there is no amplified spontaneous emission light in an input;
- subtracting a value of the calculated correction power from a value of power of output light of the optical amplifier, and calculating a gain, using the subtraction result and a value of power of input light to the amplifier;
- and
- performing, using the calculated gain, a control operation so that a gain of the optical amplification performed in the optical amplifier becomes the target gain.
A gain control device that controls, at a target gain, optical amplification performed in an optical amplifier, comprising:
- a correction power calculator configured to calculate, in response to amplified spontaneous emission light input to the optical amplifier, correction power corresponding to an amount of gain depression in a bandwidth in which spectral hole-burning occurs in the optical amplifier;
- and
- a gain controller configured to calculate, using the correction power calculated in the correction power calculator, a gain for controlling the optical amplification performed in the optical amplifier and perform, using the calculated gain, a control operation so that a gain of the optical amplification becomes the target gain.
Dependencies are inferred from the claim text.