Optical signal frequency calibration method and device
AssigneeHuawei Technologies Co., Ltd.
InventorsYuanda HUANG, Liangchuan LI
Life of this patent
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Abstract
The present invention discloses an optical signal frequency calibration method and device. The method includes: receiving a first optical signal that experiences a frequency offset and that is generated by a laser in a transmitter of an access node; receiving a reference optical signal sent by a local oscillator; calculating a difference between a specified frequency difference and a frequency difference between the reference optical signal and the first optical signal; and performing frequency calibration on the first optical signal according to the difference, modulating to-be-sent uplink data by using the calibrated first optical signal, and sending the modulated uplink data to a primary node.
Claims20
An optical signal frequency calibration method, comprising:
- receiving a first optical signal that experiences a frequency offset and that is generated by a laser in a transmitter of an access node;
- receiving a reference optical signal sent by a local oscillator, wherein the reference optical signal is obtained after a receiver of the access node performs, by using a received second optical signal sent by a primary node, frequency calibration on a third optical signal generated by the local oscillator;
- calculating a difference between a specified frequency difference and a frequency difference between the reference optical signal and the first optical signal;
- and
- performing frequency calibration on the first optical signal according to the difference, modulating to-be-sent uplink data by using the calibrated first optical signal, and sending the modulated uplink data to the primary node.
An optical signal frequency calibration device, comprising:
- a receiving unit, configured to:
- receive a first optical signal that experiences a frequency offset and that is generated by a laser in a transmitter of an access node, and receive a reference optical signal sent by a local oscillator, wherein the reference optical signal is obtained after a receiver of the access node performs, by using a received second optical signal sent by a primary node, frequency calibration on a third optical signal generated by the local oscillator;
- a calculation unit, configured to calculate a difference between a specified frequency difference and a frequency difference between the reference optical signal and the first optical signal;
- and
- a frequency calibration unit, configured to:
- perform frequency calibration on the first optical signal according to the difference, modulate to-be-sent uplink data by using the calibrated first optical signal, and send the modulated uplink data to the primary node.
An optical signal frequency calibration device, comprising:
- a signal receiver, configured to:
- receive a first optical signal that experiences a frequency offset and that is generated by a laser in a transmitter of an access node, and receive a reference optical signal sent by a local oscillator, wherein the reference optical signal is obtained after a receiver of the access node performs, by using a received second optical signal sent by a primary node, frequency calibration on a third optical signal generated by the local oscillator;
- a processor, configured to:
- calculate a difference between a specified frequency difference and a frequency difference between the reference optical signal and the first optical signal, perform frequency calibration on the first optical signal according to the difference, and modulate to-be-sent uplink data by using the calibrated first optical signal;
- and
- a signal transmitter, configured to send the modulated uplink data to the primary node.
Dependencies are inferred from the claim text.