| 摘要 |
PROBLEM TO BE SOLVED: To provide a low cost and small size light amplifier without the need of a mixer and a distributor. SOLUTION: Excited light EL generated by an LD(laser diode) chip 11a is permeated through a first optical film 11b, converged by a condenser lens 13, and conducted to erbium doped fiber 12 to excite the erbium-doped fiber 12. When signal light SL from the light source is admitted to the erbium-doped fiber 12, the signal light SL is amplified with stimulated emission light, admitted to an optical device through an optical fiber and condensing lens 13, permeated into the optical device 11, by the condenser lens 14, conducted to an optical fiber 17b, and propagated to a next stage. |
