Optical transmission device and optical transmission method
AssigneeNEC Corporation
InventorRyota Abe
Life of this patent
Estimating the term…
Abstract
In order to improve reception sensitivity of a response signal at a terminal station, an optical transmission device includes a reception unit that receives a control signal including a predetermined instruction and a main signal, via an optical transmission path connected to the terminal station, a control unit that performs the predetermined instruction of the received control signal, an extraction unit that extracts light in a band of the control signal, a response signal generation unit that modulates the extracted light in the band of the control signal, and outputs a response signal, and a multiplexing unit that multiplexes and outputs the response signal and the main signal. The control unit controls modulation by the response signal generation unit according to the control signal.
Claims20
An optical transmission device, comprising:
- a receiver configured to receive a control signal including a predetermined instruction and a main signal, via an optical transmission path connected to a terminal station;
- a controller configured to perform the predetermined instruction of the received control signal;
- an extractor configured to extract light in a band of the control signal;
- a response signal generator configured to modulate the extracted light in the band of the control signal, and output a response signal;
- and
- a multiplexer configured to multiplex and output the response signal and the main signal, wherein the controller controls modulation by the response signal generator according to the control signal, wherein
- the receiver comprises a first optical coupler configured to split the control signal and the main signal into a first split light and a second split light each including the control signal and the main signal, and output, to the extractor, the first split light,
- the controller performs the predetermined instruction in response to the control signal included in the second split light, and
- the extractor comprises a second optical coupler configured to split the first split light input from the receiver into a third split light and a fourth split light each including the control signal and the main signal, a first optical filter configured to pass the main signal and block the control signal that are included in the third split light, and output the main signal to the multiplexer, and a second optical filter configured to pass the control signal and block the main signal that are included in the fourth split light, and output the control signal to the response signal generator.
An optical transmission method, comprising:
- receiving a control signal including a predetermined instruction and a main signal, via an optical transmission path connected to a terminal station, and performing the predetermined instruction of the received control signal;
- extracting light in a band of the control signal;
- modulating the extracted light in the band of the control signal according to the control signal, and outputting a response signal;
- and
- multiplexing and outputting the response signal and the main signal, wherein
- the receiving step comprises splitting the control signal and the main signal into a first split light and a second split light each including the control signal and the main signal,
- wherein the predetermined instruction is performed in response to the control signal included in the second split light;
- wherein the extracting step comprises splitting the first split light into a third split light and a fourth split light each including the control signal and the main signal, passing the main signal and blocking the control signal that are included in the third split light, and outputting the main signal included in the third split light for the multiplexing step, and passing the control signal and blocking the main signal that are included in the fourth split light, and outputting the control signal included in the fourth split light for the modulating step.
Dependencies are inferred from the claim text.