Optical transmission apparatus and control method therefor
First Claim
1. An optical transmission apparatus for outputting wavelength-division multiplexed signal lights received together with a supervisory signal light to an optical transmission path of a next section with a predetermined optical power, comprising:
- first means for separating the supervisory signal light from the received wavelength-division multiplexed signal lights and detecting the power of the supervisory signal light;
second means for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light;
a gain control type optical amplifier for amplifying said wavelength-division multiplexed signal lights;
an optical attenuator variable in the extent of attenuation for adjusting the power level of the wavelength-division multiplexed signal lights outputted from said optical amplifier; and
a monitor and control unit for controlling said optical amplifier to keep a constant gain and controlling the extent of attenuation of said optical attenuator so that the output power of the wavelength-division multiplexed signal lights has a predetermined target value, wherein;
said monitor and control unit restrains said automatic output level control by said optical attenuator when the power of said supervisory signal light detected by said first means is fluctuating within a permissible range and fluctuations in the wavelength-division multiplexed signal light power detected by said second means has deviated from its permissible range.
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Accused Products
Abstract
An optical transmission apparatus comprising a first detector for detecting the power of the supervisory signal light separated from received wavelength-division multiplexed signal lights; a second detector for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; a gain-controlled type optical amplifier for amplifying the wavelength-division multiplexed signal lights; an optical attenuator coupled to the amplifier; and a control unit for controlling the optical amplifier and the optical attenuator so as to keep the output level of the wavelength-division multiplexed signal lights to a predetermined target value, wherein the control unit restrains automatic output level control by the optical attenuator when the supervisory signal light power fluctuates within its permissible range and fluctuations in the signal light power have deviated from its permissible range.
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Citations
12 Claims
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1. An optical transmission apparatus for outputting wavelength-division multiplexed signal lights received together with a supervisory signal light to an optical transmission path of a next section with a predetermined optical power, comprising:
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first means for separating the supervisory signal light from the received wavelength-division multiplexed signal lights and detecting the power of the supervisory signal light; second means for detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; a gain control type optical amplifier for amplifying said wavelength-division multiplexed signal lights; an optical attenuator variable in the extent of attenuation for adjusting the power level of the wavelength-division multiplexed signal lights outputted from said optical amplifier; and a monitor and control unit for controlling said optical amplifier to keep a constant gain and controlling the extent of attenuation of said optical attenuator so that the output power of the wavelength-division multiplexed signal lights has a predetermined target value, wherein; said monitor and control unit restrains said automatic output level control by said optical attenuator when the power of said supervisory signal light detected by said first means is fluctuating within a permissible range and fluctuations in the wavelength-division multiplexed signal light power detected by said second means has deviated from its permissible range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control method for an optical transmission apparatus which amplifies wavelength-division multiplexed signal lights received together with a supervisory signal light with a constant gain, and transmits amplified lights to an optical transmission path of a next section after adjusting output power level, comprising the steps of:
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detecting the power of the supervisory signal light separated from the received wavelength-division multiplexed signal lights; detecting the power of the wavelength-division multiplexed signal lights after the separation of the supervisory signal light; amplifying the wavelength-division multiplexed signal lights with a constant gain; executing automatic output level control of the amplified wavelength-division multiplexed signal lights according to a predetermined target value; and monitoring said detected supervisory signal light power and said detected wavelength-division multiplexed signal light power, and restraining the automatic output level control when the supervisory signal light power is fluctuating within its permissible range and fluctuations in the wavelength-division multiplexed signal light power has deviated from its permissible range.
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Specification