| 摘要 |
PURPOSE:To obtain a measuring device for loss wavelength characteristics having a wide wavelength range and a wide dynamic range by using a light source utilizing the nonlinear optical effect of Raman scattering, 4-photon mixing, etc. that arise when strong light is propagated in an optical fiber. CONSTITUTION:Since pulse oscillation can increase power more largely, the use of a pulse light source as a light source 1 is prevail. As an optical fiber 2 for excitation, a single mode optical fiber can increase light density and therefore 4-photon mixing is produced other than Raman scattering, and the light emission spectra are flat with respect to wavelength. In the case of a multimode optical fiber, many crests are generated in light emission spectra; therefore said fiber is suited for the case when it is desired to obtain strong light with specific wavelength. Light of a wide wavelength range is obtained simply by connecting the fiber 2 to the light source 1, and since the light is stronger by several digits than that of a halogen lamp, the loss wavelength characteristics in a repeater section are measured easily. |
