| 摘要 |
An optical amplifier system 100 comprises an optical fibre 101 for carrying an optical signal and a light source 107 for emitting light into the fibre to induce Raman gain of the optical signal passing along the fibre. An optical signal to noise ratio (OSNR) monitor 109 is coupled to the fibre for measuring the OSNR of the optical signal. A controller 108 is coupled to the light source and the OSNR monitor for controlling the Raman gain by setting the power of the light source based on the measured OSNR. The OSNR monitor may be positioned at the front or back of the section of fibre (figures 1a and 1b respectively). The light source may inject co-propagating or counter-propagating light. The light source, OSNR monitor and the controller may be included in a first pump unit 102. The system may employ a second pump unit (figure 3). A hybrid Raman-EDFA configuration may be used. |
