| 摘要 |
Pump light which, in optical amplifiers for amplifying light signals that arc transmitted in optical waveguides (4, 8), is fed through a fiber-optic coupler (5) into a light-signal-amplifying length of fiber (3) and is not completely absorbed therein, can cause problems in the transmission section. According to the invention, the light-signal- amplifying length of fiber (3) is followed by an ytterbium-containing pump-light-absorbing length of giber (7), which has a large absorption cross-section in the wavelength range of 900-1050 ~~, in which the wavelength of the pump light coming from a laser is located. -10-
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