LIGHT-EMITTING MODULE AND OPTICAL FIBER AMPLIFIER

摘要

An optical fiber amplifier comprises an amplifying optical fiber 60 for optically amplifying signal light according to pumping light incident thereon, a semiconductor light-emitting device 10 for emitting the pumping light; a light-collecting optical system 30 for collecting the pumping light; and waveguide optical fibers 20 to 22 for guiding light through core regions to the amplifying optical fiber, in which the waveguide optical fibers 20 to 22 are disposed such that a maximum width direction of the core region at an input face thereof aligns with a maximum width direction of an incident beam, and the maximum width D mu m­ of the core region at the input face satisfies <MATH> where NA is the numerical aperture, L mu m­ is the maximum width of a light-emitting region of the semiconductor light-emitting device 10, and &thetas; is the output divergent angle of the emitted light in the maximum width direction of the light-emitting region. <IMAGE>