| 摘要 |
A wavelength conversion element which can set the wavelength of a pump light to a wavelength longer or shorter than the wavelength of a plurality of signal lights and a wavelength of a plurality of conversion lights present in an optical communication band, and a method for using such a wavelength conversion element are provided. A first pump light with a wavelength lambda<SUB>1 </SUB>of 1.51 mum, a second pump light with a wavelength lambda<SUB>2 </SUB>of 1.57 mum, and a signal light with a wavelength of lambda<SUB>S </SUB>of 1.55 mum are multiplexed in a multiplexer and introduced as an incident light into an optical waveguide of a wavelength conversion element. In the optical waveguide, an SF light with a wavelength lambda<SUB>SF </SUB>of 0.77 mum is generated by the SFG of the first pump light with a wavelength lambda<SUB>1 </SUB>of 1.51 mum and the second pump light with a wavelength lambda<SUB>2 </SUB>of 1.57 mum, the signal light is wavelength converted as a DF light (wavelength 1.53 mum) by the DFG of the SF light and signal light, and this DF light is outputted as the converted light (wavelength lambda<SUB>C</SUB>=1.53 mum).
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