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US 5,861,974 AGranted
Transmission device connected to optical transmission line
AssigneeFujitsu Limited
InventorKatsuhiro Shirai
Life of this patent
Estimating the term…
Abstract
A transmission device includes an exciting light source outputting an exciting light, a first optical part which supplies an optical amplifying part with a signal light and the exciting light, a second optical part which supplies an amplified light to an optical transmission line and receives a light received via the optical transmission line, and a control part which determines whether the light received includes the exciting light output by the exciting light source and controls the exciting light source to stop outputting the exciting light.
Claims32
A transmission device comprising:
- an exciting light source outputting an exciting light;
- a first optical part which supplies an optical amplifying part with a signal light and the exciting light, said optical amplifying part forming an amplified light from said signal light and said exciting light;
- a second optical part which supplies said amplified light to an optical transmission line and receives a light via the optical transmission line;
- and
- a control part which determines whether the light received from the optical transmission line includes the exciting light output by the exciting light, and controls the exciting light source to stop outputting the exciting light, when it is determined that the light received from the optical transmission line includes the exciting light output by the exciting light source.
2 more elements
An optical transmission system comprising:
- a first transmission device;
- and
- a second transmission device coupled, via an optical transmission medium, to the first transmission device in a two-way formation,
- wherein the first transmission device includes an exciting light source outputting an exciting light, a first optical part which supplies an optical amplifying part with a signal light and the exciting light, a second optical part which supplies an optical amplifying part with a signal light and the exciting light, a second optical part which supplies an amplified light to the optical transmission medium and receives a light via the optical transmission medium, and a control part which determines whether the light received by the second optical part includes the exciting light output by the exciting light source, and controls the exciting light source to stop outputting the exciting light when the light received by the second optical part includes the exciting light output by the exciting light source.
1 more element
A method of controlling an exciting light source outputting an exciting light, said method comprising the steps of:
- determining whether a light received via a transmission line includes said exciting light;
- and
- controlling the exciting light source to stop outputting the exciting light when it is determined that the light received via the transmission line includes said exciting light.
A transmission device comprising:
- an exciting light source outputting an exciting light;
- a first optical part which supplies an optical amplifying part with a signal light and the exciting light;
- a second optical part which supplies an amplified light to an optical transmission line and receives a light via the optical transmission line;
- a control part which determines whether the light received by the second optical part includes the exciting light output by the exciting light source and controls the exciting light source to stop outputting the exciting light;
- a first part which causes the exciting light source to generate a modulated light signal having a given pattern, when it is determined that the light received by the second optical part includes the exciting light, and determines whether the light received includes the modulated light signal having the given pattern;
- and
- a switch part which supplies the modulated signal to the optical transmission line without supplying the modulated light signal to the optical amplifier part,
- the first part causing the exciting light source to stop outputting any light when it is determined that the received light includes the modulated light signal having the given pattern.
5 more elements
A transmission device comprising:
- an exciting light source outputting an exciting light;
- a first optical part which supplies an optical amplifying part with a signal light and the exciting light;
- a second optical part which supplies an amplified light to an optical transmission line and receives a light via the optical transmission line;
- a control part which determines whether the light received by the second optical part includes the exciting light output by the exciting light source and controls the exciting light source to stop outputting the exciting light;
- and
- a multiplexer/demultiplexer part which inserts a given pattern into the signal light when it is determined that the light received by the second optical part includes the exciting light, and extracts the given pattern from the light received,
- said control part causing the exciting light source to stop outputting the exciting light, when the given pattern is extracted from the light received.
4 more elements
Dependencies are inferred from the claim text.