Control apparatus and method for optical amplifier, optical amplifier, optical transmission apparatus, individual band gain equalizer, wavelength multiplexing transmission apparatus, optical amplifier and wavelength multiplexing transmission system using the same equalizer
First Claim
1. A control apparatus for an optical amplifier comprising:
- an automatic gain control unit for controlling a gain of said optical amplifier to a constant value based on power of incoming light and outgoing light of said optical amplifier and a target gain;
an individual band incoming light monitoring unit for dividing a signal wavelength band of the incoming light into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light at an decrease in the number of signal wavelengths and said second band, is a signal wavelength band other than said first band and, including a gain deviation band in which power of the outgoing light varies mainly due to a wavelength deviation of the gain control by said automatic gain control unit, and for monitoring power of the incoming light to said optical amplifier in each of the first and second bands;
an individual band signal wavelength number calculation unit for obtaining the number of signal wavelengths in each of the first and second bands based on a result of the monitoring by the individual band incoming light monitoring unit; and
a target gain correction unit for correcting said target gain to be used in said automatic gain control unit based on a result of the calculation by said individual band signal wavelength number calculation unit at a variation of the number of signal wavelengths.
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Accused Products
Abstract
A control apparatus comprises a light monitoring unit for dividing a signal wavelength band into at least a band in which output light power of an optical amplifier tends to decrease at an decrease in the number of signal wavelengths and a band including a gain deviation band, and for monitoring inputted light power for the individual divided bands, a calculation unit for obtaining the number of signal wavelengths in the individual divided bands based on a monitor result, and a target gain correction unit for correcting a target gain based on a result of the calculation. This suppresses a transient variation of signal light level due to SHB or SRS at a high speed with a simple configuration without deteriorating noise characteristic, thus enabling optical amplifiers to be further disposed in a multi-stage fashion, which can lengthen the transmission distance of a transmission system including an optical add/drop unit.
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Citations
49 Claims
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1. A control apparatus for an optical amplifier comprising:
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an automatic gain control unit for controlling a gain of said optical amplifier to a constant value based on power of incoming light and outgoing light of said optical amplifier and a target gain;
an individual band incoming light monitoring unit for dividing a signal wavelength band of the incoming light into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light at an decrease in the number of signal wavelengths and said second band, is a signal wavelength band other than said first band and, including a gain deviation band in which power of the outgoing light varies mainly due to a wavelength deviation of the gain control by said automatic gain control unit, and for monitoring power of the incoming light to said optical amplifier in each of the first and second bands;
an individual band signal wavelength number calculation unit for obtaining the number of signal wavelengths in each of the first and second bands based on a result of the monitoring by the individual band incoming light monitoring unit; and
a target gain correction unit for correcting said target gain to be used in said automatic gain control unit based on a result of the calculation by said individual band signal wavelength number calculation unit at a variation of the number of signal wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method for an optical amplifier having an automatic gain control function to control a gain of said optical amplifier to a constant value based on power of incoming light and outgoing light of said optical amplifier and a target gain, comprising the steps of:
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dividing a signal wavelength band of the incoming light into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light at a decrease in the number of signal wavelengths and said second band, is a signal wavelength band other than said band, including a gain deviation band in which power of the outgoing light varies mainly due to a wavelength deviation of the gain control, and monitoring power of the incoming light in each of the divided bands;
obtaining the number of signal wavelengths in each of the divided bands based on a result of the monitoring; and
correcting said target gain to be used for the automatic gain control based on the number of signal wavelengths in each of the divided bands at a variation of the number of signal wavelengths. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical transmission apparatus comprising:
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an automatic gain control unit for controlling a gain of an optical amplifier to a constant value based on power of incoming light and outgoing light of said optical amplifier and a target gain;
an individual band incoming light monitoring unit for dividing a signal wavelength band of the incoming light into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light per channel at an increase in the number of signal wavelengths and asid second band, is a signal wavelength band other than said band, including a gain deviation band in which power of the outgoing light per channel varies mainly due to a wavelength deviation of the gain control by said automatic gain control unit, and for monitoring power of the incoming light in each of the divided bands;
an individual band signal wavelength number calculation unit for obtaining the number of signal wavelengths in each of the divided bands based on a result of the monitoring by said individual band incoming light monitoring unit; and
a target gain correction unit for correcting said target gain to be used by said automatic gain control unit based on a result of the calculation by said individual band signal wavelength number calculation unit at a variation of the number of signal wavelengths. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An optical amplifier having an automatic gain control function to control a gain to a constant value based on power of incoming light and outgoing light and a target gain, comprising:
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dividing a signal wavelength band of the incoming light into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than said band, including a gain deviation band in which power of the outgoing light varies mainly due to a wavelength deviation of the gain control;
monitoring power of the incoming light in each of the divided bands;
obtaining the number of signal wavelengths in each of the divided bands based on a result of the monitoring; and
correcting said target gain to be used for the automatic gain control based on the number of signal wavelengths in each of the divided bands at a variation of the number of signal wavelengths. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
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37. An individual band gain equalizer comprising:
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a band division means for dividing a signal wavelength band of an incoming wavelength multiplexed light into at least a first band and second band;
said first band has tendency of decreasing power of outgoing light of an optical amplifier per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light of said optical amplifier per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than said first band, including a gain deviation band in which power of the outgoing light per channel varies mainly due to a wavelength deviation of automatic gain control in the optical amplifier; and
an adjustment means for adjusting the power of the outgoing light for the individual divided bands devided by the band division means. - View Dependent Claims (38, 39, 40, 41, 42)
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43. A wavelength multiplexing transmission apparatus using an individual band gain equalizer, comprising:
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said individual band gain equalizer including;
a band division means for dividing a signal wavelength band of an incoming wavelength multiplexed light into at least a first band and second band;
said first band has tendency of decreasing power of out going light of an optical amplifier per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than this band, including a gain deviation band in which power of the outgoing light per channel varies mainly due to a wavelength deviation of automatic gain control in the optical amplifier; and
an adjustment means for adjusting the power of the outgoing light for the individual divided bands devided by said band division means, and control means for monitoring power of input light or output light of said individual band gain equalizer for each of the divided bands to control the output light power adjustment for the individual divided bands in said adjustment means based on a result of the monitoring so that output light power of each of the divided bands becomes a predetermined target value. - View Dependent Claims (44, 45)
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46. A wavelength multiplexing transmission system using an individual band gain equalizer, comprising a wavelength multiplexing transmission apparatus including an individual band gain equalizer, wherein said individual band gain equalizer comprising:
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a band division means for dividing a signal wavelength band of an incoming wavelength multiplexed light into at least a first band and second band;
said first band has tendency of decreasing power of out going light of an optical amplifier per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than this band, including a gain deviation band in which power of the outgoing light per channel varies mainly due to a wavelength deviation of automatic gain control in the optical amplifier; and
an adjustment means for adjusting the power of the outgoing light for the individual divided bands devided by said band division means, and control means for monitoring power of input light or output light of said individual band gain equalizer for each of the divided bands to control the output light power adjustment for the individual divided bands in said adjustment means based on a result of the monitoring so that output light power of each of the divided bands becomes a predetermined target value.
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47. An optical amplifier using an individual band gain equalizer, comprising:
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an amplification medium for amplifying incoming wavelength multiplexed light;
an automatic gain control unit for carrying out automatic gain control based on power of incoming light and outgoing light of said amplification medium and a target gain;
a individual band gain equalizer for dividing a signal wavelength band of an outgoing light of said amplification medium into at least a first band and second band;
said first band has tendency of decreasing power of the outgoing light per channel at a decrease in the number of signal wavelengths or increasing power of the outgoing light per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than said first band, including a gain deviation band in which power of the outgoing light varies mainly due to a wavelength deviation of the automatic gain control so as to adjust the power of the outgoing light for the individual divided bands; and
control means for monitoring the power of the outgoing light of said amplification medium for each of the divided bands to control said output light power adjustment of said band unit gain equalizer for each of the divided bands based on a result of the monitoring so that the power of the outgoing light of each of the divided bands becomes a predetermined target value. - View Dependent Claims (48)
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49. A wavelength multiplexing transmission system using an individual band gain equalizer, comprising:
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said individual band gain equalizer including;
a band division means for dividing a signal wavelength band of an incoming wavelength multiplexed light into at least a first band and second band;
said first band has tendency of decreasing of power of the outgoing light of an optical amplifier per channel at a decrease in the number of signal wavelengths or increasing of power of the outgoing light per channel at an increase in the number of signal wavelengths and said second band, is a signal wavelength band other than said first band, including a gain deviation band in which power of the outgoing light per channel varies mainly due to a wavelength deviation of automatic gain control in the optical amplifier; and
an adjustment means for adjusting the output light power for the individual divided bands devided by said band division means, and an optical amplifier including;
control means for monitoring power of input light or output light of said individual band gain equalizer for each of the divided bands to control the output light power adjustment for the individual divided bands in said adjustment means based on a result of the monitoring so that power of the output light of each of the divided bands becomes a predetermined target value.
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Specification