Patent ID: 7602544

Claim:
A wavelength conversion device configured to obtain, from an input light, a wavelength-converted light with a wavelength shift by a wavelength shift amount of Δλ, comprising: a first wavelength converter including, a first optical amplifier configured to generate first amplified light by amplifying the input light; a first dispersion flattened fiber configured to generate first fiber output light by expanding a wavelength spectral width of the first amplified light; and a first wavelength filter configured to generate first wavelength-converted light by allowing a predetermined wavelength band of the first fiber output light to transmit therethrough, wherein the first wavelength filter shifts a central wavelength of the first wavelength-converted light by a first wavelength shift amount of Δλ 1 relative to a central wavelength of the input light; and a second wavelength converter including, a second optical amplifier configured to generate second amplified light by amplifying the first wavelength-converted light; a second dispersion flattened fiber configured to generate second fiber output light by expanding a wavelength spectral width of the second amplified light; and a second wavelength filter configured to generate second wavelength-converted light by allowing a predetermined wavelength band of the second fiber output light to transmit therethrough, wherein the second wavelength filter shifts a central wavelength of the second wavelength-converted light by a second wavelength shift amount of Δλ 2 relative to the central wavelength of the first wavelength-converted light, wherein the first wavelength shift amount of Δλ 1 and the second wavelength shift amount of Δλ 2 satisfy Δλ 1 +Δλ 2 =Δλ, Δλ 1 ×Δλ 2 <0.