Patent ID: 7039272
Filing Date: 2006-05-02
Classification: H04B

Abstract:
1. An optical transmission apparatus for transmitting a wavelength-division multiplexed light from a first optical transmission line to a second optical transmission line, comprising: a first optical amplifier for amplifying a first wavelength-division multiplexed light received from the first optical transmission line; a first chromatic dispersion compensator for compensating for chromatic dispersion of said first wavelength division multiplexed light caused during the transmission of said first wavelength-division multiplexed light from a first predetermined position on said first optical transmission line to said optical transmission apparatus; an add drop portion for dropping an optical signal of a predetermined band from said first wavelength-division multiplexed light and adding an optical signal of a certain band with said first wavelength division multiplexed light and outputting a second wavelength-division multiplexed light; a second chromatic dispersion compensator for compensating for chromatic dispersion of said second wavelength division multiplexed light caused during the transmission of said second wavelength-division multiplexed light between said optical transmission apparatus and a second predetermined position on said second optical transmission line; a second optical amplifier for amplifying said second wavelength division multiplexed light output from the second chromatic dispersion compensator; and a controller for controlling said first optical amplifier by in response to a first number of wavelengths included in said first wavelength-division multiplexed light and for controlling said second optical amplifier in response to a second number of wavelengths included in said second wavelength-division multiplexed light, wherein the second number is computed by subtracting number of dropped wavelengths in said optical signal of a predetermined band as dropped by said add drop portion from said first number and adding number of added wavelengths in said certain band as added by said add drop portion.