| 摘要 |
The optical amplifier (1) comprises two amplifying stages, an upstream amplifying stage (SM) and a downstream amplifying stage (SV). The former stage comprises an upstream active fiber (9) doped with a fluorescent dopant and connected serially to the optical fiber line (2), an upstream optical coupler (10) connected serially downstream from the upstream section of active fiber (9), a laser diode (11) for supplying pumping energy towards the upstream active fiber (9) through the coupler (10), said coupler being oriented to cause pump energy travel towards said upstream active fiber (9) in the opposite direction from the predetermined signal direction (S); the latter stage (SV) comprises a downstream active fiber (3) doped with a fluorescent dopant and connected serially in the optical fiber (2), a downstream optical coupler (4) connected serially in the downstream active fiber (3), a laser diode (5) for supplying pumping energy into the downstream active fiber (3) through the downstream coupler (4), a first optical isolator ( 7) serially connected upstream of the downstream active fiber (3), a second optical isolator (8) serially connected downstream from the downstream active fiber (3).
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