OPTICAL AMPLIFYING METHOD AND OPTICAL AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To provide an optical amplifying method that can be applied to optical amplification in a liquid crystal distribution system, such as CATV in the CWDM optical communications system and optical amplification for compensating a loss of a transmission fiber and a network device.

SOLUTION: A plurality of signal lights belong to a wavelength band of 1,540 to 1,620 nm with wavelengths, respectively different by Δλ nm or larger (Δλ is 15 or larger). The wavelengths of the signal lights are (1,571-0.5×Δλ) nm to (1,570+0.5×Δλ) nm, and a difference between the maximum wavelength and the minimum wavelength is 40 nm or shorter. The amplifying method is performed, by inputting the signal lights to an optical amplification fiber 1 in the presence of a stimulation light. The optically amplified fiber 1 is a Bi2O3group glass fiber; the signal lights are amplified in the fiber 1; and the optical amplifying method gives the signal lights to the optically amplified fiber 1, by decreasing the intensity of the signal lights whose wavelengths are (1,571-0.5×Δλ) nm to (1,570+0.5×Δλ) nm, to be lower than the intensity of other signal lights.

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