Novel approach for microwave frequency measurement based on optical power monitoring

X. Zou, W. Pan, B. Luo, Lian-shan Yan
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Abstract

An approach using a single laser source and two optical comb filters is proposed to performing microwave frequency measurement. In the proposed system, two filters with quadrature comb filtering responses are firstly constructed. The light wave of the laser source is modulated by a microwave signal under the carrier-suppression and single sideband modulation condition. The single sideband of the modulated light wave is simultaneously coupled into the two comb filters, at the outputs of which two optical powers having a quadrature relationship are detected. The microwave frequency to be measured is then estimated from the two quadrature power ratios (i.e., the sine-form and the cosine-form ratios), which are derived from a comparison between the two detected optical powers and a reference optical power. Since the ambiguity can be eliminated by using the two quadrature power ratios, the measurement range is enlarged from half free spectral range (FSR) to full FSR of the comb filtering responses. Thus the proposed approach using a single laser source can provide a larger measurement range, and especially a potential solution to the cascaded or parallel configurations.
基于光功率监测的微波频率测量新方法
提出了一种利用单激光源和两个光学梳状滤波器进行微波频率测量的方法。在该系统中,首先构造了两个具有正交梳状滤波响应的滤波器。激光源的光波在载波抑制和单边带调制条件下由微波信号调制。调制光波的单边带同时耦合到两个梳状滤波器中,在其输出处检测到具有正交关系的两个光功率。然后从两个正交功率比(即正弦形式和余弦形式的比率)估计要测量的微波频率,这是由两个检测光功率和参考光功率之间的比较得出的。由于使用两个正交功率比可以消除模糊,因此测量范围从梳状滤波响应的半自由频谱范围(FSR)扩大到全自由频谱范围。因此,采用单一激光源的方法可以提供更大的测量范围,特别是对级联或并联配置的潜在解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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