| 摘要 |
The invention concerns an optical amplifier for amplifying an optical signal (E) by stimulated emission of rare earth ions activated by the action of a pump signal. The optical amplifier comprises a laser cavity (C) consisting of two mirrors (28, 29) whereof one is an output mirror (28) for the amplified signal, the cavity containing optical amplifying means (27) doped with rare earth ions and mode converting means (30) to pump the rare earth ions. The invention is applicable, for example, in the field of optical fibre telecommunications.
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