| 摘要 |
An optical amplifier having a suitable length of Er/Yb co-doped double clad optical fibre is used to amplify an input optical signal. The inner clad of the double clad optica l fibre supports the propagation of a multi mode signal used to excite Er/Yb co-dopants in the double clad optical fibre. Simultaneously, a single mode signal launched from a single mode lase r pump co--propagates with the input optical signal in the core of the optical fibre. In this mode l, single mode light travels in the single mode core region and the multi mode pump light is mainly in the clad region. The interaction between the two laser pumps is negligible.</SDO AB>
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