POLARIZATION TYPE PARAMETRIC OPTICAL MIXER AND POLARIZATION TYPE PARAMETRIC OPTICAL WAVELENGTH CONVERSION METHOD

摘要

PROBLEM TO BE SOLVED: To efficiently shut off the pumping light included in output at the time of obtaining signal light parted by a wavelength difference Δλ(Δλ=|λ₁-λ₂|) between a wavelength λ₁ and a wavelength λ₂ from the pumping light of the former wavelength and probe light of the latter wavelength. ;SOLUTION: The pumping light of the wavelength λ₁ as linearly polarized light and the probe light of the wavelength λ₂ as circularly polarized light are inputted to an optical amplifier element 2 functioning as a mixer, by which the wavelength conversion to a wavelength λ₃ (λ₃=λ₁+Δλ) is executed. The output there of is passed through a polarizer 3 varying by 90°C from the polarized light of the pumping light, by which the pumping light of the wavelength λ₁ is shut off. The intrusion of the pumping light into the signal light of the wavelength λ₃ obtd. by the wavelength conversion is eliminated and, thereafter, the signal light is outputted through an optical filter 4 to allow the passage of the wavelength λ₃, by which the influence of the pumping light is eliminated.;COPYRIGHT: (C)1998,JPO