Raman amplifier and pumping apparatus, and program
First Claim
Patent Images
1. A Raman amplifier comprising;
- a Raman amplification medium which provides signal lights with gain through the stimulated Raman effect;
a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium; and
a means for allocating wavelengths of said pumping lights so that in respect of two arbitral pumping lights among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelength λ
min, of pumping light having the shorter wavelength and the peak wavelength λ
max, of pumping light having the longer wavelength are in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
min×
λ
max/(2λ
min−
λ
max)orλ
min×
λ
max/(2λ
min−
λ
max)>
λ
long.
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Abstract
When Raman amplification is performed, the occurrence of lightwaves through FWM in a wavelength band of input signal light is suppressed, thereby avoiding deterioration of the signal quality. Allocation of lightwaves of the pumping light is controlled so that, wavelengths of lightwaves arising through a nonlinear effect of pumping lights generated by a pumping means or of pumping lights and input signal light, or both, are not within the wavelength band of the input signal light.
4 Citations
16 Claims
-
1. A Raman amplifier comprising;
-
a Raman amplification medium which provides signal lights with gain through the stimulated Raman effect;
a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium; and
a means for allocating wavelengths of said pumping lights so that in respect of two arbitral pumping lights among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelength λ
min, of pumping light having the shorter wavelength and the peak wavelength λ
max, of pumping light having the longer wavelength are in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
min×
λ
max/(2λ
min−
λ
max)orλ
min×
λ
max/(2λ
min−
λ
max)>
λ
long. - View Dependent Claims (5, 6, 7)
-
-
2. A Raman amplifier comprising;
-
a Raman amplification medium that provides signal light with gain through the stimulated Raman effect;
a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium; and
a means for allocating wavelengths of said pumping lights so that three arbitrary pumping lights from among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelengths of which three pumping lights satisfy the expression λ
min<
λ
mid<
λ
maxare in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)orλ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)>
λ
long.
-
-
3. A Raman amplifier comprising;
-
a Raman amplification medium that provides signal light with gain through the stimulated Raman effect;
a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium; and
a means for setting or allocating the wavelengths or the power, or both, of said pumping lights, so that the power of lightwaves arising through a nonlinear effect of pumping lights generated by said pumping means, or of pumping lights and said input signal, or both, is, within the wavelength band of said signal light, at all points of said Raman amplification medium, 20 dB or more smaller than or one part per hundred or less of, the power of said signal light. - View Dependent Claims (4)
-
-
8. A pumping apparatus comprising;
-
a pumping means for injecting pumping lights of a plurality of wavelengths in a Raman amplification medium that provides signal light with gain through the stimulated Raman effect;
a means for allocating wavelengths of said pumping lights so that, in respect of two arbitrary pumping lights among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelength, λ
min, of pumping light having the shorter wavelength and the peak wavelength, λ
max, of pumping light having the longer wavelength are in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
min×
λ
max/(2λ
min−
λ
max)orλ
min×
λ
max/(2λ
min−
λ
max)>
λ
long.
-
-
9. A pumping apparatus comprising;
-
a pumping means for injecting pumping lights of a plurality of wavelengths in a Raman amplification medium that provides signal light with gain through the stimulated Raman effect;
a means for allocating wavelengths of said pumping lights so that three arbitrary pumping lights from among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelengths of which three pumping lights satisfy the expression λ
min<
λ
mid<
λ
maxare in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)orλ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)>
λ
long.
-
-
10. A pumping apparatus comprising;
-
a pumping means for injecting pumping lights of a plurality of wavelengths in the Raman amplification medium that provides signal light with gain through the stimulated Raman effect;
a means for setting or allocating the wavelengths or the power, or both, of said pumping lights, so that the power of light arising through a nonlinear effect of pumping lights generated by said pumping means, or of pumping lights and said input signal, or both, is, within the wavelength band of said signal light, at all points of said Raman amplification medium, 20 dB or more smaller than or one part per hundred or less of, the power of said signal light. - View Dependent Claims (11, 12)
-
-
13. A program which, by installation in an information processing system, provides for that information processing system, as functionality for allocating wavelengths of pumping lights applicable for a Raman amplifier comprising a Raman amplification medium that provides signal light with gain through the stimulated Raman effect and a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium, or for a pumping apparatus providing a pumping means for injecting pumping lights of a plurality of wavelengths in a Raman amplification medium that provides signal light with gain through the stimulated Raman effect, functionality that realizes allocation of wavelengths of said pumping lights so that in respect of two arbitrary pumping lights among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelength λ
- min, of pumping light having the shorter wavelength and the peak wavelength λ
max, of pumping light having the longer wavelength are in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
min×
λ
max/(2λ
min−
λ
max)orλ
min×
λ
max/(2λ
min−
λ
max)>
λ
long.
- min, of pumping light having the shorter wavelength and the peak wavelength λ
-
14. A program which, by installation in an information processing system, provides for that information processing system, as functionality for allocating wavelengths of pumping lights applicable for a Raman amplifier comprising a Raman amplification medium that provides signal light with gain through the stimulated Raman effect and a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium, or for a pumping apparatus providing a pumping means for injecting pumping lights of a plurality of wavelengths in a Raman amplification medium that provides signal light with gain through the stimulated Raman effect, functionality that realizes allocation of wavelengths of said pumping lights so that three arbitrary pumping lights from among the pumping lights of a plurality of wavelengths generated by said pumping means, the peak wavelengths of which three pumping lights satisfy the expression
λ - min<
λ
mid<
λ
maxare in a relationship to the shortest wavelength of the wavelength band of said signal light, λ
short and the longest wavelength of the wavelength band of said signal light, λ
long, expressed asλ
short>
λ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)orλ
max×
λ
mid×
λ
min/(λ
mid×
λ
min−
λ
max×
λ
mid+λ
max×
λ
min)>
λ
long.
- min<
- 15. A program which, by installation in an information processing system, provides for that information processing system, as functionality for allocating wavelengths of pumping lights applicable for a Raman amplifier comprising a Raman amplification medium that provides signal light with gain through the stimulated Raman effect and a pumping means for injecting pumping lights of a plurality of wavelengths in this Raman amplification medium, or for a pumping apparatus providing a pumping means for injecting pumping lights of a plurality of wavelengths in a Raman amplification medium that provides signal light with gain through the stimulated Raman effect, functionality that realizes allocation or setting of the wavelengths or power, or both, of said pumping lights, so that the power of light arising through a nonlinear effect of pumping lights generated by said pumping means, or of pumping lights and said signal light, or both, is, within the wavelength band of said signal light, at all points of said Raman amplification medium, 20 dB or more smaller than or one part per hundred or less of, the power of said signal light.
Specification