Lasing Threshold for Stimulated Raman Generation of Monochrome Optical Wave in Single Mode Fibers

Stimulated Raman scattering (SRS) laid in the basis of the photonic devices development such as fiber Raman lasers and fiber Raman amplifiers. In contrast with phenomenological definition of SRS threshold in the early experiments, in present work we will analyze the Raman laser threshold in the single mode fibers from the point of view the strong gain description in the active laser materials. Our analysis show that the Raman laser threshold for monochrome signal wave can be directly obtained from standard coupled equations using only fundamental fiber parameters. The quantitative data of laser threshold as function of wavelength for several wide-spread Raman fibers are presented