Patent ID: 6426965
Filing Date: 2002-07-30
Classification: H01S

Abstract:
An optical fiber cascaded Raman laser scheme, comprising:a pump light source for generating a pump light; an optical fiber for causing Raman scattering regarding the pump light as nonlinear material; a first wavelength division multiplexing optical fiber combiner for forming an intra cavity regarding light of second order stoke frequency shifted wavelength, the light being stoke frequency shifted by Raman scattering of the optical fiber; a second wavelength division multiplexing optical fiber combiner for forming the intra cavity regarding light of first and third order stoke frequency shifted wavelength, the light being stoke frequency shifted by Raman scattering of the optical fiber; a short period optical fiber bragg grating for selecting and reflecting fourth stoke frequency shifted wavelength of output wavelength in intra cavity, the intra cavity being formed by the wavelength division multiplexing optical fiber combiner; a long period bragg grating for causing loss on fifth order stoke frequency shifted wavelength and preventing oscillation, the fifth order being next order of output wavelength of the intra cavity; first means for passing pump light emitted from the pump light source and reflecting light of fourth order stoke frequency shifted output wavelength, the first means being connected between the pump light source and the wavelength division multiplexing optical fiber combiner; and second means for reflecting pump light emitted from the pump light source and passing light of output wavelength.