| 摘要 |
<p>A method of operating an optical amplifier (4.xb) in an optical transmission system (1) comprising a number of spans (4.x) each having a respective line fibre (4.xa), in particular in an optical transmission system comprising at least two different line fibre types with different tolerances to non-linearities, said amplifier being connected with a given line fibre span with respective characteristic span loss, L, and respective characteristic span non-linear tolerance, C, which may be proportional to one of a maximum authorised power, a number of spans times power, and a non-linear cumulated phase, expressed on a dB scale, for operating said given span at an input power, P, corresponding to an output power of said amplifier. The proposed method comprises the step of setting said output power relative to a reference output power, Pref, defined for a reference span with reference span loss, Lref, and reference span non-linear tolerance, Cref, said step of setting said output power comprising:
- compensating a first deviation in span loss between said reference span and said given span by means of a first contribution to said output power relative to said reference output power; and
- compensating a second deviation in span non-linear tolerance between said reference span and said given span by means of a second contribution to said output power relative to said reference output power, in particular by means of a second contribution proportional to said second deviation.</p> |
