Optical repeater adjusting power of output optical signal and output electrical signal and method performed by the optical repeater
AssigneeElectronics and Telecommunications Research Institute
InventorsSeung-Hyun CHO, Joonyoung KIM, Minkyu SUNG, Jong Hyun LEE
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Abstract
An optical repeater performs an electrical-to-optical conversion based on a power level of an optical signal or an optical modulation index (OMI) required by a radio unit or a host unit connected to the optical repeater. Further, the optical repeater performs an optical-to-electrical conversion based on a power level of a radio frequency (RF) signal required by the radio unit or the host unit connected to the optical repeater.
Claims15
An optical transmitter included in an optical repeater of a base station for mobile communication, the optical transmitter comprising:
- an electrical interface configured to receive a radio frequency (RF) signal;
- a first RF power measurement component configured to measure a power level of the received RF signal;
- an RF amplifier configured to amplify the RF signal passing through the first RF power measurement component;
- a second RF power measurement component configured to measure a power level of the amplified RF signal;
- an RF attenuator configured to adjust an amplitude of the RF signal passing through the second RF power measurement component;
- a third RF power measurement component configured to measure a power level of the amplitude adjusted RF signal;
- a laser diode configured to generate an optical signal using the RF signal passing through the third RF power measurement component;
- a laser diode output optical power measurement component configured to measure a power level of the output optical signal;
- and
- a controller configured to control, an operation of at least one of the RF amplifier, the RF attenuator, and the laser diode based on the power measured by the first RF power measurement component, the second RF power measurement component, the third RF power measurement component, and the laser diode output optical power measurement component such that an optical modulation index (OMI) of the optical signal satisfies a preset OMI.
An optical receiver included in an optical repeater of a base station for mobile communication, the optical receiver comprising:
- a photodiode configured to convert an optical signal into a radio frequency (RF) signal;
- a photodiode input optical power measurement component configured to measure a power level of the optical signal input into the photodiode;
- an RF amplifier configured to amplify the RF signal;
- a first RF power measurement component configured to measure a power level of the amplified RF signal;
- an RF attenuator configured to adjust an amplitude of the RF signal passing through the first RF power measurement component;
- a second RF power measurement component configured to measure a power level of the amplitude adjusted RF signal;
- and
- a controller configured to manage an operation of at least one of the RF amplifier and the RF attenuator based on the powers measured by the photodiode input optical power measurement component, the first RF power measurement component, and the second RF power measurement component such that a power level of the RF signal satisfies a preset power level.
An optical signal transmitting method performed by an optical repeater, the optical signal transmitting method comprising:
- measuring a power of a radio frequency (RF) signal input into, the optical repeater;
- amplifying the RF signal based on an amplifier gain;
- measuring a power level of the amplified RF signal;
- attenuating the amplified RF signal based on an attenuation level;
- measuring a power level of the attenuated RF signal;
- determining whether to adjust the amplifier gain by comparing the power level of the attenuated RF signal and a preset power level;
- converting the attenuated RF signal into an optical signal, in response to determination that the amplifier gain is not to be adjusted;
- and
- transmitting the optical signal generated by converting the attenuated RF signal.
Dependencies are inferred from the claim text.