Optical fiber component for Raman amplification, Raman amplifier and optical communications system
AssigneeSumitomo Electric Industries, Ltd.
InventorTetsufumi Tsuzaki
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Abstract
The present invention relates to an optical fiber component for Raman amplification having a construction for effectively suppressing deterioration of the transmission characteristic caused by amplification of scattered light components. The optical fiber component for Raman amplification has an optical fiber for Raman amplification and is inserted at a position where the effective deterioration amount of the optical SN ratio produced by DRBS-XT (Double Rayleigh Back Scattering-Crosstalk) is 1 dB or less at the signal output terminal of the optical fiber for Raman amplification.
Claims21
An optical fiber component for Raman amplification, comprising:
- an optical fiber for Raman-amplifying signal light of a plurality of channels of mutually different wavelengths;
- and
- a device, inserted at a predetermined position in said optical fiber for Raman amplification, selectively attenuating by 10 dB or more light that propagates in an opposite direction to the signal light,
- wherein said device is inserted at a position where an effective deterioration amount of an optical SN ratio produced by DRBS-XT (Double Rayleigh Back Scattering-Crosstalk), at a signal output terminal of said optical fiber for Raman amplification, becomes 1 dB or less.
An optical fiber component for Raman amplification, comprising:
- an optical fiber for Raman-amplifying signal light of a plurality of channels of mutually different wavelengths;
- and
- a device, inserted at a predetermined position in said optical fiber for Raman amplification, selectively attenuating by 10 dB or more light that propagates in an opposite direction to the signal light,
- wherein said device is inserted at a position where an absolute value |MPI-XT| of MPI (Multi-Line Interference) crosstalk at a signal output terminal of said optical fiber for Raman amplification and an optical SN ratio OSNR satisfy the condition:
- 0≦log((|MPI-XT|+OSNR)/|MPI-XT|)≦0.1
An optical fiber component for Raman amplification, comprising:
- an optical fiber for Raman-amplifying signal light of a plurality of channels of mutually different wavelengths;
- and
- a device, inserted at a predetermined position in said optical fiber for Raman amplification, selectively attenuating by 10 dB or more light that propagates in an opposite direction to the signal light,
- wherein said device is inserted at a position where an absolute value |DRBS-XT| of DRBS-XT (Double Rayleigh Back Scattering-Crosstalk) at a signal output terminal of said optical fiber for Raman amplification and an optical SN ratio OSNR satisfy the following condition:
- 0≦log((|DRBS-XT|+OSNR)/|DRBS-XT|)≦0.1.
Dependencies are inferred from the claim text.