Patent ID: 6839164

Claim:
Optical transmission equipment comprising: a wavelength divider for dividing a received multiplexed wavelength optical signal by wavelength band into a first wavelength band optical signal and a second wavelength band optical signal in accordance with a characteristic of an optical amplifier dependent on wavelength; a first optical amplifier for amplifying the first wavelength band optical signal at an input side of the optical transmission equipment; a second optical amplifier for amplifying the first wavelength band optical signal at an output side of the optical transmission equipment; a first processing unit coupled between the first optical amplifier and the second optical amplifier; a third optical amplifier for amplifying the second wavelength band optical signal at the input side of the optical transmission equipment; a fourth optical amplifier for amplifying the second wavelength band optical signal at the output side of the optical transmission equipment; and a second processing unit coupled between the third optical amplifier and the fourth optical amplifier, wherein each of the first and second processing units further divides the first and second wavelength band optical signals into narrower wavelength band optical signals and performs processing on the narrower wavelength band optical signals depending on respective narrower wavelength bands.