| 摘要 |
An optical amplifier comprises: a first gain medium having an optical host that contains a rare earth dopant and a first pump that supplies optical energy at a first wavelength into this first gain medium. The first gain medium is an optical fiber of a predetermined length, such that inversion of this first gain medium is not saturated. The optical amplifier further comprises a second gain medium operatively coupled to the first gain medium and a second pump that supplies optical energy into the second gain medium. According to an embodiment of the present invention the predetermined length of the optical fiber of the first gain medium is 1 to 6 meters and preferably 1.5 to 4.5 meters. |
