Optical fiber, nonlinear optical fiber, optical amplifier using it, wavelength converter, and manufacture method of optical fiber

摘要

An optical fiber (optical fiber non-linear) structure having a high non-linearity, using the outer periphery a first cladding region 20 and the second cladding region cladding the structure installing the double 30 in the core region (10). By employing a double cladding structure, to the non-linear coefficient (γ) larger, increasing the addition concentration of GeO ₂ added into the core, and increasing the nonlinear refractive index, and also, the core and the clad and the specific refractive index difference larger and the effective area of the If smaller (a _eff) at any, it is possible to sufficiently shorten the cut-off wavelength (λc). Thus, at the same time and having a sufficient non-linearity, the cut-off wavelength is shortened optical fiber, the optical fiber nonlinearities, optical amplifier using the same, the wavelength converter and an optical fiber manufacture method is realized. ; An optical amplifier, a wavelength converter, an optical fiber, a wavelength converter, a cut-off wavelength