Photon instantaneous frequency measurement scheme with broadband measurement range

A technology of instantaneous frequency measurement and broadband measurement, which is applied in the field of microwave detection and microwave photonics, and can solve the problems of high measurement resolution and low measurement resolution

Inactive Publication Date: 2010-09-22
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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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 ...

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  • Photon instantaneous frequency measurement scheme with broadband measurement range
  • Photon instantaneous frequency measurement scheme with broadband measurement range
  • Photon instantaneous frequency measurement scheme with broadband measurement range

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Embodiment Construction

[0016] The implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, the solution of the present invention consists of three continuous laser light sources 100, 200, 300, two couplers 400, 600, a carrier suppression single sideband modulation module 500, two phase demodulation modules 700, 800, and a look-up table operation 900 poses.

[0018] The output optical signals of the three laser light sources 100, 200, 300 (the wavelengths are respectively λ 1 ,λ 2 ,λ 3 ) are coupled into the carrier suppression single sideband modulation module 500 at the same time, and the microwave signal to be measured (its frequency is f) carries out small signal modulation to them, and only obtains +1 order (or -1 order) optical sideband; The +1 order (or -1 order) optical sidebands of different wavelength bands are divided into two paths by the coupler 600 and injected into two phase demodulati...

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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...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B10/12G01M11/02
Inventor 邹喜华郑狄潘炜闫连山罗斌
Owner SOUTHWEST JIAOTONG UNIV
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