Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2008-07-01
2008-07-01
Hughes, Deandra M (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
Reexamination Certificate
active
10299808
ABSTRACT:
A Raman amplifier providing a wideband gain for use in a wavelength division multiplexing (WDM) optical communication system. In one embodiment, a first optical amplifier Raman amplifies a wavelength division multiplexed signal light in both a first wavelength band and a second wavelength band in accordance with a plurality of excitation (pumping) lights provided to the first optical amplifier, the first and second wavelength bands being different from each other. A divider divides the amplified signal light into first and second lights in the first and second wavelength bands, respectively. A second optical amplifier amplifies the first light and has a gain band in the first wavelength band. The third optical amplifier amplifies the second light and has a gain in the second wavelength band. In various embodiments, a gain equalizer and/or an optical isolator is used in combination with the first optical amplifier providing the Raman amplification. A controller is also provided to control the excitation lights provided to the first optical amplifier to achieve specific effects.
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Hayashi Etsuko
Kinoshita Susumu
Onaka Miki
Sugaya Yasushi
Tanaka Tomoto
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