Photon instantaneous frequency measurement scheme with broadband measurement range

Abstract

The invention discloses a photon instantaneous frequency measurement scheme with a broadband measurement range. Microwave signals are loaded to three continuous laser light sources with different output wavelengths through a carrier-suppressed single sideband modulating module; and only +1-order (or -1-order) light sidebands are generated. The three +1-order (or -1-order) light sidebands are divided into two paths and are input into two phase demodulation modules respectively. A first phase demodulation module adopts a first laser wavelength and a second laser wavelength while the second phase demodulation module adopts the first laser wavelength and a third laser wavelength so as to obtain two phase values of which the change periods are mutually in a prime number relation in a frequencydomain. A unique determined microwave frequency can be demodulated in a frequency interval (F=F1*F2) according to the two phase values which are mutually in the prime number relation. By using the scheme of the invention, a frequency measurement range is manyfold expanded on the premise of not changing frequency measurement accuracy.

Description

technical field [0001] The invention relates to the fields of microwave photonics and microwave detection, in particular to photon frequency measurement technology. Background technique [0002] Microwave detection technology is an indispensable measurement method and tool in the research, production and maintenance of microwave equipment and systems, involving frequency, amplitude, signal type, modulation system, direction of arrival and other detection content. At present, microwave frequency bands adopted and planned to be adopted in microwave technology and applications are constantly increasing, so frequency measurement is facing a huge challenge and a rare opportunity: that is, it is necessary to quickly detect the frequency of the microwave signal to be measured within a broadband range. In recent years, taking the rise of microwave photonics as an opportunity, photon-based instantaneous frequency measurement technology has gradually become a research hotspot. The spe...

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Problems solved by technology

[0004] It should be pointed out that both of the above two technical routes need to introduce a relative time delay at two optical wavelengths to implement frequency measurement, and the measurement range or measurement resolution is thus limited by the relative time delay: the greater the relative time delay, the greater the measurement The smaller the range, the higher the measurement resolution; conversely, the larger the measurement range, the lower the measurement resolution

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