| 摘要 |
A two-way repeater apparatus for directly amplifying optical signals, to be transmitted in mutually opposite directions, with little distortion by directly exciting laser media. An outward optical signal (S6) passes ports 8b and 8c of an optical circulator 8, is amplified by an Er ion-doped optical fiber 11, and further passes ports 13a and 13b of another optical circulator 13 to become an outward output optical signal (S9). Meanwhile, an inward optical signal (S6r) passes ports 13b and 13c of the optical circulator 13, is amplified by another Er ion-doped optical fiber 10, and further passes ports 8a and 8b of the optical circulator 13 to become an inward output optical signal (S9r). <IMAGE> |
