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| Number | Title | Issue Date |
| 5731892 | Article comprising hybrid optical fiber amplifier Multistage Er-doped fiber amplifiers (EDFAs) are disclosed. They comprise a first stage that comprises Er and Al, and further comprise a second stage that comprises Er and a further rare earth element, exemplary Yb. Such multistage EDFAs can have advantag... | 03/24/1998 |
