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时钟信号的好坏在同步、解复用和光判决中起着决定性的作用,双折射光纤环镜具有灵活可调的滤波特性,光时钟信号通过双折射环形镜可以使其消光比得到改善,从而提高时钟信号的质量。为此提出了利用高双折射光纤环形镜提高光时钟信号消光比的方案,数值上模拟了环形镜透射谱随双折射器件偏振延时量(Δt)、偏振控制器快慢轴角度以及偏振控制器所引入光程差的变化而变化的情况,并理论分析了消光比不理想的时钟信号经过环形镜后的光谱形式。用法布里-珀罗滤波器提取的40 GHz时钟信号进行实验,时钟经过环形镜后消光比改善了13 dB,实验结果和理论模拟得到了很好的匹配。
The quality of the clock signal plays a decisive role in the synchronization, demultiplexing and optical decision. The birefringent fiber ring mirror has the characteristics of flexible and adjustable filtering. The optical clock signal can be improved by the birefringence toroidal mirror so that the extinction ratio can be improved Improve the quality of the clock signal. In order to improve the extinction ratio of optical clock signal, a scheme of using high birefringence fiber ring mirror to increase the extinction ratio of the optical clock signal is proposed. The transmission spectrum of the circular mirror is simulated numerically with the polarization delay (Δt) of the birefringent device, the fast and slow axis angles of the polarization controller and the polarization controller The optical path difference introduced by the changes and the situation, and the theoretical analysis of the clock extinction ratio is not ideal after passing through the ring mirror spectral form. The 40 GHz clock signal extracted by the Fabry-Perot filter was used to experiment. The extinction ratio of the clock after the toroidal mirror was improved by 13 dB. The experimental results were well matched with the theoretical simulation.