A broadband continuous tuning optical carrier microwave filter device

Abstract

The invention discloses a broadband continuous tuning optical carrier microwave filtering device, which comprises spectral hole-burning crystal, a low-temperature thermostat, an electrooptical modulator, a carrier wave laser, an optical fiber collimator, a frequency accurate-tuning laser, an arbitrary signal generator, a converging lens and an extender lens, wherein the frequency accurate-tuning laser emits a hole-burning preset laser light to irradiate the crystal; ions with a corresponding frequency are excited to an upper energy level; within the lifetime of the upper energy level, a spectral burnt hole with a corresponding laser light frequency is left in the crystal; a microwave signal is loaded to a carrier wave laser light through the electrooptical modulator; and when to-be-filtered optical carrier microwave signals irradiate the same position of the crystal, the optical carrier microwave signal with the corresponding spectral hole-burning frequency passes through the crystal and the signals with other frequencies are absorbed by the crystal, so that reconfigurable and tunable optical carrier microwave signal filtering is achieved. The broadband continuous tuning optical carrier microwave filtering device has the characteristics of being flexible, tunable, reconfigurable and the like within a broad frequency range on the basis of transient spectral hole burning; and the single-passband frequency response is easy to achieve.

Description

technical field [0001] The invention relates to the field of microwave photonics, in particular to a broadband continuous tuning light-borne microwave filtering device. Background technique [0002] Filtering is a key link in microwave signal processing. With the increasingly complex electromagnetic environment, the bandwidth and rate requirements for signal processing are also getting higher and higher, which poses a challenge to traditional electronic filters. In recent years, microwave photonic technology has received great attention in the fields of microwave signal generation, transmission and processing due to its advantages of large bandwidth, high resolution and anti-electromagnetic interference, especially in the field of microwave filtering. Its flexible filter tuning ability And waveform reconstruction potential provides a powerful means for microwave signal processing. [0003] The principle of the microwave photonic filter can be roughly described as follows: t...

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Problems solved by technology

[0005] Because the tuning of the existing microwave photonic filter is not flexible enough, it is difficult to realize single-pass band filtering, and the tuning range is small, the present invention proposes a broadband continuous tuning light-borne microwave filtering device

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