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US 2007/0166052 A1Published application
Wavelength division multiplexing optical transmission equipment and method of amplifying optical wavelength division multiplexed signals
AssigneeHitachi, Ltd.
InventorsTetsuya Uda, Shigehiro Takashima, Shigenori Hayase, Yoshimasa Kusano, Satoshi Asamizu, Hirofumi Nakano
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Abstract
Optical signal transmission is improved by reducing the variance in light output level and OSNR by adjusting optical signal intensity and gain tilt, taking SRS influence into consideration.
Claims5
A wavelength division multiplexing transmission system comprising;
- a first relay node transmitting an optical signal from a first transmission path to a second transmission path, amplifying the optical signal with a fast optical amplifier and adjusting a light output intensity variance by a wavelength of the optical signal with a first gain tilt controller;
- a second relay node transmitting the optical signal received from the first relay node via the second transmission path to a third transmission path, amplifying the optical signal with a second optical amplifier and adjusting a light output intensity variance by a wavelength of the optical signal with a second gain tilt controller;
- and
- a control node setting values of light output intensity for each of the first optical amplifier and the second optical amplifier and setting values of gain tilt for each of the first gain tilt controller and the second gain tilt controller.
1 more element
Dependencies are inferred from the claim text.