Optical waveguide, light source, and optical amplifier

摘要

The present invention relates to an optical waveguide and the like having a structure for generating a wide band of ASE. The optical waveguide comprises a material mainly comprised of glass or glass ceramics, and is at least partly doped with a rare earth element. In a spectrum of ASE generated in the optical waveguide when supplied with pumping light having a single wavelength in particular, a 15-dB band or 10-dB band includes a range from 1.45 mum to 1.65 mum or a range from 1.5 mum to 1.7 mum. Alternatively, a 3-dB band includes S, C, and L bands.