Apparatus and method for polarization control in coherent optical reception system
AssigneeElectronics and Telecommunications Research Institute
InventorsSang Rok Moon, Hun Sik Kang
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Abstract
Provided is an operation method of a coherent optical reception system. The operation method includes the following configurations. A coherent optical receiver configured to receive light from at least two light sources; a local oscillator (LO) configured to transmit first LO light to the coherent optical receiver, and a polarization controller configured to transmit a signal for polarization control to the LO, wherein the polarization controller is configured to transmit a first control signal to the LO on the basis of a first reception signal, and the LO is configured to transmit second LO light to the coherent optical receiver on the basis of the first control signal.
Claims9
A coherent optical reception system, comprising:
- a coherent optical receiver configured to receive light from at least two light sources;
- a local oscillator (LO) configured to transmit first LO light to the coherent optical receiver;
- and
- a polarization controller configured to transmit a signal for polarization control to the LO,
- wherein the polarization controller is configured to:
- receive a first reception signal from a signal processor, the signal processor being configured to
- receive a signal corresponding to the first LO light from the coherent optical receiver and process the signal into a digital signal,
- identify an intensity or a quality or both of the first reception signal, and
- generate a first control signal based on the first reception signal to maximize the intensity or the quality or both of the first reception signal, and transmit the first control signal to the LO, and
- the LO is configured to transmit second LO light to the coherent optical receiver based on the first control signal.
An operation method of a local oscillator (LO) in a coherent optical reception system, the operation method comprising:
- transmitting first local oscillator (LO) light to a coherent optical receiver;
- receiving a first control signal for polarization control from a polarization controller, the first control signal being generated on the basis of a first reception signal corresponding to the first LO light;
- and
- transmitting second LO light on the basis of the first control signal to the coherent optical receiver,
- wherein the polarization controller is configured to:
- receive the first reception signal from a signal processor, the signal processor being configured to
- receive a signal corresponding to the first LO light from the coherent optical receiver and process the signal into a digital signal,
- identify an intensity or a quality or both of the first reception signal, and
- generate the first control signal based on the first reception signal to maximize the intensity or the quality or both of the first reception signal, and
- transmit the first control signal to the LO, and
- wherein the LO is configured to transmit second LO light to the coherent optical receiver based on the first control signal.
Dependencies are inferred from the claim text.