Patent ID: 8958692
Filing Date: 2015-02-17
Classification: H04B

Abstract:
1. An optical fiber transmission system comprising a first node and a second node neighboring with each other, wherein said first node comprises a first optical amplifier which outputs a signal to a first transmission line for transmitting a signal from said first node to said second node, and a first monitoring control unit, wherein said second node comprises a monitor which monitors arrival of a signal from said first transmission line, a second optical amplifier which outputs a signal to a second transmission line for transmitting a signal from said second node to said first node, and a second monitoring control unit, wherein upon detection of signal disconnection from said first transmission line by said monitor, said second monitoring control unit transmits a power reduction notification for making output power of said first optical amplifier reduced to said first monitoring control unit, wherein upon receipt of said power reduction notification, said first monitoring control unit reduces power of said first optical amplifier, and transmits a completion notification as a notification representing completion of power reduction of said first optical amplifier to said second monitoring control unit, and wherein upon not receiving said completion notification even after expiration of an allowed time set in advance, said second monitoring control unit reduces signal power of said second optical amplifier.