Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2006-09-29
2009-10-20
Phan, Hanh (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S033000, C398S038000, C398S095000, C398S094000, C398S097000, C398S177000, C398S181000, C398S160000, C398S018000, C359S337000, C359S341410, C359S341420, C330S059000, C330S308000, C385S024000, C385S037000, C385S122000
Reexamination Certificate
active
07606488
ABSTRACT:
In a wavelength-division-multiplexing optical transmission system in which optical-node apparatuses that perform relay transmission of wavelength-division-multiplexed light are located at specified nodes in a main optical transmission path, an optical amplifier switches level control to constant-gain control when there is a notification of a change in the number of multiplexed wavelengths, and then after a specified amount of time restarts level control so that the level becomes a target level that corresponds to the actual number of wavelengths. When doing this, an optical-transmission-system-control unit controls the optical-transmission system so that the equationin-line-formulae description="In-line Formulae" end="lead"?T<Y/(N·v)in-line-formulae description="In-line Formulae" end="tail"?is satisfied, wherein T denotes a period from the time when a change in the number of multiplexed wavelengths occurs until said constant-gain control starts v denotes output-level-recovery speed of the optical amplifier, Y denotes fluctuation allowance of a receiving unit after wavelength-division-multiplexing transmission, and N is a maximum number of spans.
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Fujitsu Limited
Phan Hanh
Staas & Halsey , LLP
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