Photonic microwave frequency measurement method and device with highly-efficient digital coded output

Abstract

The invention discloses a photonic microwave frequency measurement method and a photonic microwave frequency measurement device with highly-efficient digital coded output. The method comprises the following steps of: loading a microwave signal to be measured onto a continuous laser light source by using a carrier suppression type single side band modulation module to generate a single optical side band; splitting the optical side band by using an optical coupler, and inputting the split optical side band into a comb filter module, wherein the filter module comprises n parallel comb filters, and the free spectral ranges and relative phase shift of filter responses of the comb filters form a cyclic binary coded combination; and performing detection, comparison and judgment on the output light power of the n comb filters and a reference arm to obtain the n-bit cyclic binary coded digital frequency measurement output. By the method and the device, digital coding efficiency is greatly improved on the basis of realizing photonic microwave frequency measurement with the digital output; and the method and the device have the advantages of least error, high frequency measurement resolution and the like.

Description

technical field [0001] The invention relates to the fields of microwave detection, microwave photonics and photon filtering, in particular to photon technology type digital microwave frequency detection technology. Background technique [0002] The detection technology for effective measurement and analysis of microwave signals and microwave systems is an indispensable detection method and tool in the research, production and maintenance of devices, systems and equipment, and is widely used; moreover, the current rapid development of microwave technology has given Detection technology has brought a huge impact. Taking microwave signals as an example, the detection content extends to multi-dimensional parameters including frequency, amplitude, signal type, modulation system, direction of arrival, etc., and the performance requirements for detection range, detection accuracy and response time are also constantly improving. Among them, the frequency parameter, as a parameter r...

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Problems solved by technology

Explorations in this area are relatively rare, such as recent reports (X.Zou, W.Pan, B.Luo, and L.Yan, "Instantaneous frequency measurement with digital outputs based on an optical filter array," [C]OFC / NFOEC2011, Paper: JWA047, USA, Mar.2011) gives the digital measurement results of the phase-shifting comb filter; but the digital output results are in the form of circular code encoding (R.van de Plassche, CMOS integrated analog-to -digital and digital-to-analog converters (2nd ed)[M].Boston, MA: Kluwer, 2003, pp.114–115), for example, the actual number of effective codes for 4-bit output is 8 (ie 2× 4); thus the encoding efficiency is low, and the number of encodings (32, i.e. 2 4 )

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