US 9,166,679 B2Granted

Optical amplification apparatus, method for controlling same, optical receiver station, and optical transmission system

AssigneeFujitsu Limited

InventorNorifumi Shukunami

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Abstract

An optical amplification apparatus includes an optical amplification medium configured to receive a first light signal from an end of the optical amplification medium and a second light signal from the other end of the optical amplification medium in opposite directions, the first and second light signals being branched from a light signal, an excitation light source configured to supply excitation light to the optical amplification medium through a multiplexer, a monitor configured to monitor the first and second light signals input to the optical amplification medium, respectively and to output monitoring signals respectively, and a controller configured to control the excitation light source in accordance with the monitoring signals.

Claims17

Dependent claims

An optical amplification apparatus, comprising:

an optical amplification medium configured to receive a first light signal input from a first end of the optical amplification medium and a second light signal input from a second end of the optical amplification medium in opposite directions, the first and second light signals being divided from a light signal;
an excitation light source configured to supply excitation light to the optical amplification medium through a multiplexer;
a monitor configured to monitor the first light signal input to the optical amplification medium with respect to a first threshold value and second light signal input to the optical amplification medium with respect to a second threshold value, respectively and to output monitor signals respectively;
and
a controller configured to determine a failure in the first light signal if the first light signal is less than the first threshold value and determine a failure in the second light signal if the second light signal is less than the second threshold value and control the excitation light source in accordance with the determinations.

2 more elements

An optical amplification apparatus, comprising:

a first input port that receives a work light signal transmitted through a first optical transmission path;
a second input port that receives a protection light signal corresponding to the work light signal, transmitted through a second transmission path;
an optical amplifier that amplifies the work light signal input to a first input/output unit from the first input port and the protection light signal input to a second input/output unit from the second input port in a direction different from a direction of the work light signal and that outputs a work light signal after amplification from the second input/output unit and a protection light signal after amplification from the first input/output unit;
a first output port that outputs the work light signal after the amplification output from the second input/output unit;
a second output port that outputs the protection light signal after the amplification output from the first input/output unit;
an excitation light source that supplies excitation light to the optical amplifier for the amplification from at least either the first input/output unit or the second input/output unit;
and
a controller that determines a failure in the work light signal if the work light signal is less than a first threshold value and determines a failure in the protection light signal if the protection light signal is less than a second threshold value and controls the excitation light, based on the determinations.

5 more elements

A method of controlling an optical amplification apparatus, comprising:

an optical amplifier that amplifies a light signal input through a first optical transmission path to a first input/output unit and a protection light signal corresponding to the light signal, input through a second optical transmission path to a second input/output unit in a direction different from a direction of the light signal and that outputs a light signal after amplification from the second input/output unit and a protection light signal after amplification from the first input/output unit;
an excitation light source that supplies excitation light to the optical amplifier for the amplification from at least either the first input/output unit or the second input/output unit;
and
a controller that controls the excitation light,
wherein the controller determines a failure in the light signal if the light signal is less than a first threshold value and determines a failure in the protection light signal if the protection light signal is less than a second threshold value,
wherein the controller controls the excitation light on the basis of the determinations, and
wherein the excitation light source supplies the excitation light controlled by the controller to the optical amplifier.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/425,640Filed 21 Mar 2012
Priority: JP 2011-0825154 Apr 2011
Published: US 2012/0248287 A14 Oct 2012
Granted: 20 Oct 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04B 10/032
Arrangements for fault recovery: using working and protection systems
H04B 10/0797
Using measurements of the data signal: monitoring line amplifier or line repeater equipment
H04B 10/2937
Considering the whole optical path: systems with a repeater placed only at the beginning or the end of the system, i.e. repeaterless systems, e.g.…
H04J 14/0294
Optical channel protection: dedicated protection at the optical channel