Patent ID: 8565613

Claim:
A wavelength conversion apparatus, comprising: a first nonlinear medium that receives a first input light and outputs a first output light having a wavelength which is shifted by Raman effect and is longer than that of the first input light, the shifted wavelength being dependent on optical power of the first input light; a second nonlinear medium that receives a second input light and a light output by a light source and outputs a second output light having a wavelength dependent on wavelengths of the second input light and the light; a wavelength monitor that monitors a wavelength of an output light; and an optical power adjuster that adjusts the optical power of the first input light based on the wavelength of the output light monitored by the wavelength monitor, wherein the first output light is input as the second input light to the second nonlinear medium, and the output light is output as the second output light output from the second nonlinear medium and is partially provided to the wavelength monitor, or wherein the second output light is input as the first input light to the first nonlinear medium, and the output light is output as the first output light output from the first nonlinear medium and is partially provided to the wavelength monitor.