WDM link for radio base station
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Mar 19, 2012
filing date -
Mar 19, 2012
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Abstract
A radio base station has a baseband controller coupled to a radio head by an optical wavelength division multiplexed link to pass downlink signals on a first wavelength, and uplink signals on another wavelength. A compensating delay is applied to one of the signals to compensate for a difference in transmission times between the downlink and the uplink signals. The compensating delay can be controlled according to the difference in wavelengths. By compensating for such differences in transmission times, synchronization problems can be avoided or ameliorated, or transmission distances can be increased. This can result in more flexibility in choice of wavelengths, fiber types and fiber lengths, and greater resilience. This can enable simpler installation or configuration, or reconfiguration without needing to take care to restrict the selection of wavelengths on the WDM link or restrict the length of the link for example.
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