In order to solve the phase noise deterioration caused by large shaking amplitude and drastic temperature changes of o-verhead optical cable,a fiber frequency transmission scheme based on electronic phase compensation is designed by using bidirectional transmission and pre-compensation technology.The frequency transmission test is carried out on the actual link containing 30 km o-verhead optical cable with a total length of 133 km.Compared with the unidirectional transmission scheme,the bidirectional transmis-sion scheme improves the phase noise index by 28 dB.The bidirectional transmission fiber frequency transmission technology is used to make a comparison test between the overhead optical cable and the 133 km buried optical cable,and the transmission of the over-head optical cable deteriorates by 4 dB under the level 5 wind,which can meet the needs of frequency transmission under the overhead optical cable.On-site test results show that the optical frequency transfer technology based on electronic phase conjugation can opti-mize the phase noise of frequency signals transmitted by overhead optical cables,and provide a support for the multi-station synchroni-zation scheme of distributed radar,distributed time-keeping system,and space telemetry and control system.
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