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US 9,438,343 B2Granted
Transmitting device, communication system, and method for transmission level control
AssigneeFujitsu Limited
InventorsNorifumi Shukunami, Kosuke Komaki
Life of this patent
Estimating the term…
Abstract
A transmitting device includes a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line; and a controller configured to control a transmission level of the signal light in accordance with a reception level of probe light which is input from the receiver over the medium in the transmission line.
Claims16
A transmitting device, comprising:
- a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line;
- and
- a controller configured to
- receive a probe light which is input from the external receiver over the medium in the transmission line in an opposite direction of the signal light, the probe light being unmodulated;
- calculate a transmission loss in the medium included in the transmission line based on a difference of a transmission level of the signal light and a reception level of the probe light;
- and
- control the transmission level of the signal light by compensating for variations of transmission line loss in the medium included in the transmission line based on the calculated transmission loss.
4 more elements
A communication system, comprising:
- a transmitting device, including:
- a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line, the external receiver demodulating the signal light into an electrical signal;
- a controller configured to
- receive a probe light which is input from the external receiver over the medium in the transmission line in an opposite direction of the signal light, the probe light being unmodulated,
- calculate a transmission loss in the medium included in the transmission line based on a difference of a transmission level of the signal light and a reception level of the probe light, and
- control the transmission level of the signal light by compensating for variations of transmission line loss in the medium included in the transmission line based on the calculated transmission loss;
- and
- a receiver that is connected with the transmitting device via a transmission line, wherein the receiver includes
- a receiving section configured to receive signal light from the transmitting device over the transmission line,
- a generator configured to generate the probe light, and
- a receiving-end light guiding unit, interposed between the receiving section and the transmission line, that guides to the receiving section the signal light input from the transmitting device over the transmission line, and guides the probe light generated by the generator to the transmission line.
8 more elements
A method for transmission level control, comprising:
- transmitting signal light to an external receiver over a medium included in a transmission line from a transmitter;
- receiving a probe light which is input from the external receiver over the medium in the transmission line in an opposite direction of the signal light, the probe light being unmodulated;
- calculating a transmission loss in the medium included in the transmission line based on a difference of a transmission level of the signal light and a reception level of the probe light;
- and
- controlling the transmission level of the signal light by compensating for variations of transmission line loss in the medium included in the transmission line based on the calculated transmission loss.
2 more elements
A transmitting device, comprising:
- a transmitter configured to transmit signal light to an external receiver through an optical fiber included in a transmission line;
- and
- a controller configured to
- receive a probe light which is input from the receiver through the same optical fiber in the transmission line in an opposite direction of the signal light;
- calculate a transmission loss in a medium included in the transmission line based on a difference of a transmission level of the signal light and a reception level of the probe light;
- and
- control the transmission level of the signal light by compensating for variations of transmission line loss in the medium included in the transmission line based on the calculated transmission loss.
4 more elements
Dependencies are inferred from the claim text.