A device and method for frequency measurement based on mach-zehnder type optical filter

Abstract

The invention belongs to the technical field of microwave and optical communication, and discloses a device and method for frequency measurement based on a Mach-Zehnder type optical filter, including a laser light source (LD), a polarization modulator (PoLM), a polarization controller (PC), Coupler, polarizer (Pol), optical filter (Filter), erbium-doped fiber amplifier (EDFA) and photodetector (PD). In this scheme, an intensity modulator and a phase modulator can be equivalently formed in the upper and lower channels by using a polarization modulator plus a polarization controller and a polarizer, and the frequency measurement range can be adjusted by adjusting the time delay device of the optical filter. After the modulation signals of the upper and lower channels pass through the optical filter, photoelectric conversion occurs at the photodetector. After signal processing, the amplitude comparison function (ACF) related to the frequency of the signal to be measured can be obtained, and then the frequency measurement function can be realized. This scheme has the characteristics of simple structure, convenient tuning of frequency range and precision, and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of microwave and optical communication, and in particular relates to a device and method for frequency measurement based on a Mach-Zehnder type optical filter. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: Microwave photonics is an emerging interdisciplinary subject. Its research scope includes photonic generation of microwave signals, microwave photonic signal processing, microwave frequency measurement based on photon technology, and optoelectronic devices working at microwave frequencies. Many functions that are difficult to realize in traditional microwave systems can be realized by using microwave photonic technology. Therefore, microwave photonics technology has received extensive attention in recent years and has been widely used in many fields such as military, medical, communication, and aerospace. With the increase of the signal ...

AI Technical Summary

Problems solved by technology

Due to the limitations of experimental conditions, most of the current frequency measurement research is mainly for theoretical derivation and simulation verification, and lacks the test of actual measurement results.

In addition, the measurement error value in the experiment is relatively large, and the measurement range is relatively small

[0005] (2) Many current schemes are mainly single-frequency measurement, which is insufficient in actual combat

[0006] The difficulty and significance of solving the above technical problems: it is of great significance to solve the problems existing in the existing technology and realize the requirements of low measurement error and high sensitivity; and in actual combat, for complex electromagnetic environments, the signals that need to be processed by the receiving end are often multiple The synthesis of frequencies poses a great challenge to many current frequency measurement schemes. In order to adapt to complex frequency measurement environments, today's frequency measurement technologies must be able to adapt to more complex measurement environments

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