Single wavelength type microwave frequency measurement scheme adopting orthogonal optical power ratios

Abstract

The invention discloses a single wavelength type microwave frequency measurement scheme adopting orthogonal optical power ratios. In the scheme, a microwave signal is loaded to an output optical signal of a continuous laser light source through a carrier suppression single-side band modulation module; a single first-order optical band is only generated; and the optical band is simultaneously input to two comb filters which are constructed by the same high-double refraction element. Due to filtering, detection and contrast, two optical power ratios which have a cosine function relationship anda sine function relationship with the microwave frequency are obtained respectively, namely the orthogonal optical power ratios are obtained. A unique frequency value can be demodulated from the whole free frequency spectrum region responded by the comb filtering by combining the two orthogonal optical power ratios. The invention constructs a microwave frequency measurement scheme by adopting theorthogonal optical power ratios through a single light source and a single high-double refraction element, measures the frequency in the whole free frequency spectrum region through a simplified device, and has wide application prospect in designing and combining structural frequency measurement devices.

Description

technical field [0001] The invention relates to the fields of microwave photonics and microwave detection, in particular to photon-type microwave frequency measurement technology. Background technique [0002] With the rise of microwave photonics, the generation, transmission and processing of microwave signals with photonic technology has gradually become a research hotspot. Taking photon technology-based microwave frequency measurement as an example, it has obvious advantages in broadband instantaneous performance, low loss, and anti-electromagnetic interference. Based on the analysis of the current research progress, the frequency measurement scheme based on optical power detection has a greater competitive advantage because it only requires low-speed photodetectors. Most of this type of schemes use channel filters, optical domain mixing effects, and optical comb filters to obtain frequency information. [0003] Taking the optical comb filter scheme as the research and ...

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Problems solved by technology

[0004] It should be pointed out that because in the same free spectrum region, one value of the optical power ratio may correspond to two frequency values, resulting in ambiguity in frequency measurement; therefore, the measurement ranges of the above three reported frequency measurement schemes are all limited to comb In the half of the free spectrum area of ​​the shape filter response; on the one hand, this limits the frequency measurement range, and on the other hand, it also makes it impossible to build a combined frequency measurement structure such as a cascaded structure

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