Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2008-05-13
2008-05-13
Hughes, Deandra M. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
Reexamination Certificate
active
07372622
ABSTRACT:
In a WDM transmission system employing a plurality of short wavelength bands having great attenuation due to optical fiber transmission, an optical repeater is constructed of a first multiplexing section and a second multiplexing section. The first multiplexing section is used for wavelength-multiplexing both the excitation light from a first Raman excitation light source, which distributively amplifies an S+ band included in light propagating through an optical fiber, and the light propagating through the optical fiber. The second multiplexing section is used for wavelength-multiplexing both the excitation light from a second Raman excitation light source, which distributively amplifies an S+ band included in light propagating through an optical fiber, and the light propagating through the optical fiber. The first and second multiplexing sections are provided between the optical fibers disposed between end offices. Thus an equal and satisfactory optical SN ratio even at any band are obtained.
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Hainberger Rainer
Kumasako Junichi
Nakamura Kentaro
Terahara Takafumi
Fujitsu Limited
Hughes Deandra M.
Staas & Halsey , LLP
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