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利用西安和咸阳之间的电信省级骨干光纤网构建了210km的光学频率信号传递测试链路,链路损耗为0.23dB/km。实验中采用可搬运、基于光纤干涉仪、线宽约为200 Hz的激光器作为光源,利用两台低噪声双向掺铒光纤放大器(EDFA)补偿光纤链路损耗和增加光信号的传输距离,放大器平均增益控制在15dB左右,以防止激射。通过测量和分析不同情况下光纤链路的附加相位噪声,可观测到铁路震动引起的规律性干扰。当噪声抑制系统在锁定状态时,链路的相位噪声被抑制了23dB,在剔除铁路干扰时段数据后,获得的210km实地通信链路的秒级频率稳定度达到了1.51×10-14,万秒频率稳定度达到了5×10-17。利用210km通信链路进行了光学频率信号的远程传递测试,分析了限制频率稳定度的主要影响因素,并针对现行光纤布设方式提出了补充要求。该研究为基于通信链路的高精度光学频率信号的传递与比对提供理论支撑。
A 210km optical frequency signal transfer test link was constructed by using telecom provincial backbone optical fiber network between Xi’an and Xianyang. The link loss was 0.23dB / km. In this experiment, two low-noise two-way erbium-doped fiber amplifiers (EDFAs) were used to compensate the fiber link loss and increase the optical signal transmission distance by using a portable, fiber-based interferometer with a linewidth of about 200 Hz as a light source. Gain control around 15dB to prevent lasing. By measuring and analyzing the additional phase noise of the optical fiber link under different conditions, the regular interference caused by railway vibrations can be observed. When the noise suppression system is locked, the phase noise of the link is suppressed by 23dB. After removing the data of the railway interference period, the second-class frequency stability of the 210km field communication link obtained reaches 1.51 × 10-14, Frequency stability reached 5 × 10-17. The long distance transmission test of optical frequency signal was carried out by using 210km communication link. The main factors that affected the stability of the frequency were analyzed. And the supplementary requirements were proposed for the existing fiber layout. The research provides theoretical support for the transmission and comparison of high-precision optical frequency signals based on communication links.