Tunable multitapped microwave photonic filter capable of combining coherent system with incoherent system

A microwave photonic, incoherent technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of poor stability and low resolution, and achieve the effects of good stability, simplified system, and great application potential.

Inactive Publication Date: 2019-05-17
SHANDONG UNIV OF TECH
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Problems solved by technology

[0006] The tunable variable-tap microwave photon filter combined with the technical advantages of the coherent system and the non-coherent system provided by the present invention can solve the technical problems of low resolution and poor stability of the conventional microwave photon filter, and realize microwave photon Filter tunability and variable tap count features

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  • Tunable multitapped microwave photonic filter capable of combining coherent system with incoherent system
  • Tunable multitapped microwave photonic filter capable of combining coherent system with incoherent system
  • Tunable multitapped microwave photonic filter capable of combining coherent system with incoherent system

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Embodiment Construction

[0039] Specific embodiments of the present invention will be described in detail below. In order to avoid unnecessary details, well-known structures or functions will not be described in detail in the following embodiments. The language of approximation used in the following examples can be used for quantitative expressions, showing that some variation in quantity is permissible without changing the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0040] Tunable variable-tap microwave photonic filters that combine the technical advantages of coherent and incoherent systems, such as figure 1 As shown, it includes a single-wavelength light source 1, a polarization controller 2, a Mach-Zehnder modulator 3, a radio frequency signal generator 4, a laser power amplifier 5, a first collimating lens 6, a slit mask 7...

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Abstract

The invention provides a tunable multitapped microwave photonic filter capable of combining the technical advantages of a coherent system and an incoherent system, and belongs to the field of microwave photonics. The core part of the filter is an optical delay line module based on a coherent system single optical wavelength and an incoherent system multi-mode optical fiber, the single optical wavelength lowers cost and simplifies a system; the multimode optical fiber provides mode dispersion and generates a time delay between modes, a spatial wavelength division multiplexing delay line structure provided by the multimode optical fiber eliminates an optical coherence phenomenon, an the microwave photonic filter is endowed with a high resolution and flexible frequency response characteristics. In addition, on the basis of a slit mask plate, the light beam incidence angle of an incidence multimode optical fiber can be regulated to realize the tunable characteristics of a filter tap, and the light beam number of the incidence multimode optical fiber can be changed to realize the variable characteristics of a filter tap number. The filtering experiment of the filter displays that a waveinhibition rejection ratio can be above 30dB, and stability is good.

Description

technical field [0001] The invention relates to the technical field of microwave photonic filters, in particular to a tunable tap number variable microwave photonic filter combining the technical advantages of a coherent system and an incoherent system. mode fiber to construct an optical delay line module. The system has simple structure, low cost, high resolution and flexible frequency response. The technical problems of low resolution and poor stability of the conventional microwave photonic filter are solved, and the tunability and tap number variable characteristics of the microwave photonic filter are realized at the same time. Background technique [0002] Microwave photonics combines microwave and photonics, integrating the advantages of both, transparent conversion between radio frequency waves (RF-radiofrequency) and optical fiber, microwave provides a low-cost mobile wireless connection, and optical fiber provides low-cost loss of broadband connection. [0003] ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01G02F1/025
Inventor 刘晓娟胡平刘英郭立萍葛筱璐韩克祯耿雪
Owner SHANDONG UNIV OF TECH
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