Patent ID: 6894830

Claim:
A bi-directional optical-amplifier module comprising: a first optical amplifier; a second optical amplifier; a third optical amplifier; a fourth optical amplifier; a mid-stage device for performing a desired signal processing for an upward or downward optical signal passing therethrough; a first optical-signal-path-setting device for supplying an optical signal inputted to a first input/output terminal of the bi-directional optical-amplifier module, while outputting an optical signal outputted from the fourth optical amplifier to the first input/output terminal; a second optical-signal-path-setting device for supplying an optical signal inputted to a second input/output terminal of the bi-directional optical-amplifier module, while outputting an optical signal outputted from the third optical amplifier to the second input/output terminal; a third optical-signal-path-setting device for outputting an optical signal outputted from the first optical amplifier to a first input/output terminal of the mid-stage device, while supplying an optical signal outputted from the first input/output terminal of the mid-stage device to the fourth optical amplifier; and, a fourth optical-signal-path-setting device for outputting an optical signal outputted from the second optical amplifier to a second input/output terminal of the mid-stage device, while supplying an optical signal outputted from the second input/output terminal of the mid-stage device to the third optical amplifier.