Raman amplifier
First Claim
1. A Raman amplifier for amplifying signal light that includes communication information from an upstream station by using a transmission line fiber, and for receiving the amplified signal light, comprising:
- a pump light source to supply pump light to the transmission line fiber toward the upstream station;
a signal light monitoring unit to measure an intensity of the received signal light;
a target calculating unit to calculate a corresponding intensity of amplified spontaneous scattering light from a required Raman gain by using a correlation between a Raman gain and an intensity of amplified spontaneous scattering light that occurs with Raman amplification, and to calculate a target light intensity for a total intensity of the amplified spontaneous scattering light and the amplified signal light from the obtained intensity of amplified spontaneous scattering light and an intensity of the amplified signal light; and
a pump light controlling unit to control the intensity of the pump light output from the pump light source so that the intensity of light measured by the signal light monitoring unit becomes equivalent to the target light intensity calculated by the target calculating unit.
1 Assignment
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Accused Products
Abstract
When pump light is supplied to a transmission line fiber from a downstream station toward an upstream station and signal light from the upstream station is Raman-amplified, a corresponding intensity of amplified spontaneous scattering light is calculated from a required Raman gain by using a correlation between a Raman gain and the intensity of amplified spontaneous scattering light that occurs with Raman amplification, and further a target light intensity is calculated from the obtained intensity of the amplified spontaneous scattering light and the intensity of the amplified signal light. Then, the intensity of the pump light is controlled so that the intensity of light, which is measured by the downstream station, becomes equivalent to the target light intensity.
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Citations
10 Claims
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1. A Raman amplifier for amplifying signal light that includes communication information from an upstream station by using a transmission line fiber, and for receiving the amplified signal light, comprising:
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a pump light source to supply pump light to the transmission line fiber toward the upstream station; a signal light monitoring unit to measure an intensity of the received signal light; a target calculating unit to calculate a corresponding intensity of amplified spontaneous scattering light from a required Raman gain by using a correlation between a Raman gain and an intensity of amplified spontaneous scattering light that occurs with Raman amplification, and to calculate a target light intensity for a total intensity of the amplified spontaneous scattering light and the amplified signal light from the obtained intensity of amplified spontaneous scattering light and an intensity of the amplified signal light; and a pump light controlling unit to control the intensity of the pump light output from the pump light source so that the intensity of light measured by the signal light monitoring unit becomes equivalent to the target light intensity calculated by the target calculating unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A Raman-amplifying method for amplifying signal light by using a transmission line fiber in a downstream station that receives signal light that is output from an upstream station to the transmission line fiber and includes communication information, comprising:
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supplying pump light to the transmission line fiber toward the upstream station; measuring an intensity of the signal light received from the upstream station; calculating a corresponding intensity of amplified spontaneous scattering light from a required Raman gain by using a correlation between a Raman gain and an intensity of amplified spontaneous scattering light that occurs with Raman amplification; calculating a target light intensity for a total intensity of the amplified spontaneous scattering light and the amplified signal light from the obtained intensity of the amplified spontaneous scattering light and the intensity of the amplified signal light; and controlling the intensity of the pump light so that the measured intensity of light becomes equivalent to the target light intensity calculated by the calculating the target light intensity for the total intensity.
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Specification