| 摘要 |
A bi-directional optical amplifier according to the present invention comprises: an optical circulator with four ports; a first and second optical amplification fibers, each optically amplifying an entered signal light with the help of a pumping light; two pumping light sources, each outputting a pumping light; two optical couplers; and a wave-length selection/reflection filter which selectively reflects a specific wave-length of a signal light. The optical circulator, comprising four ports, a first to fourth ports, outputs entered lights one after another to each adjacent port. The first and second optical amplification fibers are connected to the first and third ports of the optical circulator, respectively.
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