OPTICAL FUNCTIONING GLASS, OPTICAL FIBER, WAVEGUIDE DEVICE, AND OPTICALLY ACTIVE DEVICE

摘要

An optically active device comprising an optical fiber, a light source and a coupler is disclosed. The optical fiber has a core made of a silicate glass containing Rb and/or Cs oxide. The core is doped with Nd<3><+> as an active ion and transmits light at 1.3 mu m band. The light source generates excitation light at 0.8 mu m. The coupler directs the excitation light from the light source into the core of the optical fiber. A signal light or a spontaneous light at 1.3 mu m band which is transmitted in the core stimulates Nd<3><+> to emit light at 1.3 mu m band. As a result an optical function such as optical amplification can be effected at 1.3 mu m band.