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US 6,023,366 AGranted
Optical communication system and optical amplifier
AssigneeFujitsu Limited
InventorSusumu Kinoshita
Life of this patent
Estimating the term…
Abstract
An optical communication system having a transmitting station for outputting WDM(wavelength-division multiplexing) signal light, an optical fiber transmission line, a receiving station, and an optical repeater including an optical amplifier. The transmitting station includes a supervisory circuit for detecting the number of channels of the WDM signal light and transmitting supervisory information including the number of channels to the optical repeater. The optical repeater further includes a circuit for controlling the optical amplifier so that the output level of the optical amplifier becomes a target level. The target level is set according to the supervisory information. According to the structure, it can be possible to provide a system which can easily respond to a change in the number of WDM channels.
Claims29
An optical communication system for transmitting WDM (wavelength-division multiplexing) signal light via an optical transmission line, comprising:
- a first terminal station outputting optical signals having different wavelengths, and wavelength-division multiplexing said optical signals to output WDM signal light to the optical transmission line;
- a second terminal station receiving said WDM signal light from the optical transmission line;
- and
- an optical repeater provided in said optical transmission line and including an optical amplifier amplifying said WDM signal light, wherein
- said first terminal station includes a supervisory circuit determining a number of channels in the WDM signal light and corresponding to the number of said different wavelengths, and transmitting supervisory information indicating the determined number of channels to said optical repeater, and
- said optical repeater includes a detector detecting an output level of said optical amplifier, and a controller controlling said optical amplifier so that said output level becomes a target level in accordance with said supervisory information.
3 more elements
An optical communication system, comprising:
- first and second terminals, the first terminal transmitting a wavelength division multiplexed (WDM) signal including a plurality of channels multiplexed together to the second terminal through an optical transmission line, the first terminal determining the number of channels in the WDM signal and transmitting supervisory information indicating the determined number of channels;
- an optical amplifier amplifying the WDM signal as the WDM signal travels through the optical transmission line from the first terminal to the second terminal;
- and
- a control device receiving the transmitted supervisory information and controlling the optical amplifier to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
1 more element
An apparatus comprising:
- an optical amplifier amplifying a wavelength division multiplexed (WDM) signal;
- and
- a controller receiving supervisory information transmitted from upstream of the optical amplifier and indicating the number of channels in the WDM signal as determined by a device upstream of the controller, the controller controlling the optical amplifier to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
A method comprising:
- transmitting a wavelength division multiplexed (WDM) signal including a plurality of channels multiplexed together through an optical transmission line;
- determining the number of channels in the WDM signal:
- transmitting supervisory information indicating the determined number of channels in the WDM signal through the optical transmission line;
- amplifying the WDM signal as the WDM signal travels through the optical transmission line;
- receiving the transmitted supervisory information through the optical transmission line;
- and
- controlling said amplifying to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
4 more elements
An apparatus comprising:
- a transmitter transmitting a wavelength division multiplexed (WDM) signal including a plurality of channels multiplexed together through an optical transmission line;
- means for determining the number of channels in the WDM signal:
- means for transmitting supervisory information indicating the determined number of channels in the WDM signal through the optical transmission line;
- an optical amplifier amplifying the WDM signal as the WDM signal travels through the optical transmission line;
- means for receiving the transmitted supervisory information through the optical transmission line, and for controlling said amplifying to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
2 more elements
An optical communication system, comprising:
- a transmission line;
- a first terminal multiplexing a plurality of channels together into a wavelength division multiplexed (WDM) signal and transmitting the WDM signal through the transmission line, the plurality of channels including a supervisory channel different from the other channels in the WDM signal and transmitting supervisory information indicating the number of channels in the WDM signal;
- an optical amplifier amplifying the WDM signal as the WDM signal travels through the transmission line;
- and
- a controller receiving the transmitted supervisory information from the transmission line and controlling the optical amplifier to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
2 more elements
An optical communication system, comprising:
- a first terminal transmitting a wavelength division multiplexed (WDM) signal through a transmission line, the WDM signal including a plurality of channels multiplexed together, the WDM signal including supervisory information indicating the number of channels in the WDM signal, the supervisory information being transmitted by at least one channel of the WDM signal but not by all of the channels in the WDM signal;
- an optical amplifier amplifying the WDM signal as the WDM signal travels through the transmission line;
- and
- a controller receiving the transmitted supervisory information from the transmission line and controlling the optical amplifier to maintain the amplified WDM signal at a target level in accordance with the number of channels indicated by the received supervisory information.
1 more element
An optical communication system comprising:
- a plurality of optical transmitters for respectively transmitting a plurality of optical signals having different wavelengths, the optical signals being combined into a wavelength division multiplexed (WDM) signal light which is transmitted through an optical transmission line, each optical transmitter producing a status signal indicating whether or not the optical transmitter is transmitting an optical signal;
- a supervisory circuit receiving the status signals, determining a number of channels in the WDM signal light from the status signals, and transmitting supervisory information through the optical transmission line indicating the determined number of channels;
- an optical amplifier positioned along the optical transmission line and amplifying the WDM signal light;
- and
- a controller receiving the transmitted supervisory information through the optical transmission line and controlling the optical amplifier so that an output level of the optical amplifier becomes a target level in accordance with the supervisory information.
2 more elements
Dependencies are inferred from the claim text.