Optical amplifier repeater

An optical amplifier repeater, comprising:

• a first optical amplifier that amplifies main signal light and supervisory signal light transmitted on an up optical-fiber transmission line;
• a second optical amplifier that amplifies the main signal light and the supervisory signal light transmitted on a down optical-fiber transmission line;
• a transfer means that transfers part of the supervisory signal light transmitted on said up optical-fiber transmission line onto said down optical-fiber transmission line, and that transfers part of the supervisory signal light transmitted on said down optical-fiber transmission line onto said up optical-fiber transmission line;
• wherein said transfer means comprises an optical amplifier input side transfer means that transfers supervisory signal light reflected by a third light-reflecting means inserted to an input side of said first optical amplifier to an output side of said second optical amplifier, and transfers the supervisory signal light reflected by a fourth light-reflecting means inserted to an input side of said second optical amplifier to an output side of said first optical amplifier.

An optical amplifier repeater, comprising:

• a first optical amplifier that amplifies main signal light and supervisory signal light transmitted on an up optical-fiber transmission line;
• a second optical amplifier that amplifies main signal light and supervisory signal light transmitted on a down optical-fiber transmission line;
• a transfer means that transfers part of supervisory signal light transmitted on said up optical-fiber transmission line onto said down optical-fiber transmission line, and that transfers part of supervisory signal light transmitted on said down optical-fiber transmission line onto said up optical-fiber transmission line;
• wherein said transfer means comprises an optical amplifier output side transfer means that transfers supervisory signal light reflected by a first light-reflecting means inserted to an output side of said first optical amplifier to an output side of said second optical amplifier, and transfers supervisory signal light reflected by a second light-reflecting means inserted to the output side of said second optical amplifier to the output side of said first optical amplifier, and an optical amplifier input side transfer means that transfers supervisory signal light reflected by a third light-reflecting means inserted to the input side of said first optical amplifier to output side of said second optical amplifier, and transfers supervisory signal light reflected by a fourth light-reflecting means inserted to an input side of said second optical amplifier to the output side of said first optical amplifier.

An optical amplifier repeater, comprising:

• a first optical amplifier that amplifies a main signal light and a supervisory signal light transmitted on an up optical-fiber transmission line;
• a second optical amplifier that amplifies the main signal light and the supervisory signal light transmitted on a down optical-fiber transmission line;
• a transfer means that transfers part of the supervisory signal light transmitted on said up optical-fiber transmission line onto said down optical-fiber transmission line, and that transfers part of the supervisory signal light transmitted on said down optical-fiber transmission line onto said up optical-fiber transmission line;
• wherein said transfer means comprises a first light-reflecting means that is connected to a forward output port of a second-order side transmission line of a first optical coupler disposed on the output side of said first optical amplifier, a second light-reflecting means that is connected to the forward output port of the second-order side transmission line of a second optical coupler disposed on an output side of said second optical amplifier, a third light-reflecting means that is connected to the forward output port of the second-order side transmission line of a third optical coupler disposed on an input side of said first optical amplifier, a fourth light-reflecting means that is connected to the forward output port of the second-order side transmission line of a fourth optical coupler disposed on the input side of said second optical amplifier, an optical transmission line that connects between a reverse output port of the second-order side transmission line of said fourth optical coupler and a reverse output port of the second-order side transmission line of said first optical coupler, and an optical transmission line that connects between a reverse output port of the second-order side transmission line of said second optical coupler and a reverse output port of the second-order side transmission line of said third optical coupler.