Optical transmission equipment for suppressing a four wave mixing and optical transmission system
AssigneeHitachi, Ltd.
InventorsTetsuya Uda, Ryoichi Miyake, Takeshi Nakada, Yoshimasa Kusano, Elichirou Takizawa
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Abstract
There is suppressed deterioration of transmission quality resulting from FWM light generated in the optical fiber of an optical transmission apparatus that performs wavelength division multiplex transmission. To suppress deterioration of the transmission quality due to the FWM light, the sender apparatus adjusts the intensity of wavelength-division-multiplexed light output to the optical fiber, according to a level of FWM crosstalk observed by receiver apparatus.
Claims6
A method for transmitting an optical signal from a transmitter-side apparatus to a receiver-side apparatus via a plurality of relay apparatuses, comprising:
- notifying respective relay apparatuses of a first allowable value which is a difference between FWM (four wave mixing) light and signal light contained in the optical signal between adjacent relay apparatuses;
- measuring, by a first relay apparatus, the difference between the FWM light and the signal light contained in the optical signal, the difference being received from a second relay apparatus adjacent to the first relay apparatus;
- transmitting, by the first relay apparatus, the difference thus measured to the second relay apparatus;
- and
- adjusting, by the second relay apparatus, magnitude of the optical signal transmitted to the first relay apparatus so that the measured difference thus received coincides with the first allowable value notified.
Dependencies are inferred from the claim text.