Patent ID: 7379677
Filing Date: 2008-05-27
Classification: G02F

Abstract:
1. A wavelength conversion method in which an amplitude-modulated first light having an optical frequency f 1 is received and a second light having a wavelength different from a wavelength of the first light is output, the method comprising the steps of: multiplexing the first light and a reference light, the reference light being a continuous light having a wavelength different from the wavelength of the first light and having an optical frequency f propagating the multiplexed first light and reference light through an optical fiber so as to generate a third light having a wavelength different from the wavelength of the first light and an optical frequency f causing the third light to pass through an optical filter having a pass wavelength range set such that a pulse time width of the third light is 20% or more narrower than a pulse time width of the first light after such passage through said optical filter, thereby obtaining a second light, wherein an absolute value of wavelength dispersion of said optical fiber is not larger than 0.2 ps/nm/km at the wavelength of the first light.