一种中频相同的微波光子信道化接收机

发布时间：2018-01-08 09:02

本文关键词：一种中频相同的微波光子信道化接收机　出处：《光电子·激光》2014年12期 　论文类型：期刊论文

【摘要】：提出一种基于相干光处理的微波信道化接收机,采用自由谱范围(FSR)不同的两套光频率梳(OFC,optical frequency combs)分别作为光载波和光本振,使得各个信道的输出具有相同的中频。本文方法将微波信号调制到载波OFC的每一个频率分量上,并用法布里-珀罗(F-P)光滤波器对多个信道的调制光边带同时进行带通滤波,然后与本振OFC进行相干探测实现频率下转换。若载波OFC比本振OFC的FSR大于1个信道带宽,并使F-P滤波器的FSR与本振OFC相等,可得到等带宽、等中频的微波信道,降低了后续电路的复杂度。对两个相邻信道进行了实验,将9.74~9.86GHz和9.86~9.98GHz波段的信号分别下转换到两个带宽为120MHz的中频信道,两个中频信道的中心频率仅相差4 MHz分别为900 MHz和896 MHz,表明本文方法能够实现等中频的信道输出。
[Abstract]:A microwave channelized receiver based on coherent optical processing is proposed. Two sets of optical frequency comb OFC with different free spectrum range (FSRs) are used. Optical frequency combs are used as optical carrier and optical local oscillator respectively. The output of each channel has the same if frequency.; in this paper, the microwave signal is modulated to each frequency component of the carrier OFC. The modulated optical sideband of a plurality of channels is simultaneously filtered by a Fabry-Perot F-P) optical filter. Then the frequency down-conversion is realized by coherent detection with the local oscillator OFC. If the carrier OFC is larger than the FSR of the local oscillator OFC, and the FSR of the F-P filter is equal to that of the local oscillator OFC, the channel bandwidth of the carrier OFC is larger than that of the local oscillator OFC. The microwave channel with equal bandwidth and equal intermediate frequency can be obtained, which reduces the complexity of the subsequent circuits. The experiments on two adjacent channels are carried out. Two intermediate frequency channels with a bandwidth of 120 MHz are converted from 9.74 to 9.86 GHz and 9.86 to 9.98 GHz respectively. The central frequency difference between the two if channels is only 4 MHz and 896 MHz, respectively, which indicates that the proposed method can achieve equal if channel output.
【作者单位】：东南大学电子科学与工程学院;
【分类号】：TN851
【正文快照】： 1引言信道化接收机通过对电磁频谱的分段、并行检测,实时、连续地分析每个电磁频段的信号,可以监测捷变频雷达和多个同时到达的雷达信号,是电子侦察接收机的重要组成部分[1,2]。传统的声表面波信道化滤波器组和声光信道化接收机受声波调制带宽的限制,瞬时带宽不超过几个*E-mai

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