| 摘要 |
[01] An optical pumping apparatus provides pumping for a Raman amplifier across either the C-band alone, or across both the C-band and the L -band. A first pump unit provides the optical pump energy necessary for a flat gain response in the C-band. A second pump unit, operating as an upgrade module, can be activated to expand the pumping range into the L-band. The second uni t provides both the pump energy for the expanded portion of the gain spectrum, as well as pump energy for the C-band that compensates for any disruption of the gain profile, so that a flat gain response is maintained across both the C-band and the L-band.
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