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A tunable ultra-narrowband microwave photonic bandpass filter

A band-pass filter and microwave photonic technology, which is applied in the direction of waveguide-type devices, circuits, electrical components, etc., to achieve the effect of broadband tunable

Inactive Publication Date: 2018-12-11
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the implementation of ultra-narrowband microwave photonic filters is mostly notch filters, and bandpass filters are rarely reported.

Method used

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  • A tunable ultra-narrowband microwave photonic bandpass filter
  • A tunable ultra-narrowband microwave photonic bandpass filter
  • A tunable ultra-narrowband microwave photonic bandpass filter

Examples

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Embodiment Construction

[0020] Embodiments of the present invention provide a tunable ultra-narrowband microwave photonic bandpass filter, thereby realizing the technical effects of wideband tunability, ultranarrow passband and high out-of-band rejection ratio.

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] A kind of tunable ultra-narrowband microwave photonic bandpass filter provided by the invention, such as figure 1 As shown, it includes a fiber coupler 10, an electro-optic phase modulator 20, an optical filter 30, an...

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Abstract

The present invention relates to the technical field of microwave signal processing, in particular to a tunable ultra-narrowband microwave photonic bandpass filter, which includes sequentially connected fiber couplers, electro-optic phase modulators, optical filters, optical isolators, optical fibers, and optical rings. The optical circulator includes a first port, a second port and a third port, and the first port is connected to an optical fiber, the second port is connected to a photodetector, and the third port has an adjustable input power and wavelength. Three light sources, the first light source and the second light source are input to the fiber coupler, and the RF signal input port of the electro-optic phase modulator inputs the RF signal to be filtered, thereby realizing the technology of wideband tunability, ultra-narrow passband and high out-of-band rejection ratio Effect.

Description

technical field [0001] The invention relates to the technical field of microwave signal processing, in particular to a tunable ultra-narrowband microwave photon bandpass filter. Background technique [0002] Microwave photonic filters use optical devices to process microwave signals. They have the advantages of small loss, small size, light weight, large bandwidth, and strong anti-electromagnetic interference capabilities. They have great potential in wireless communication networks, sensor detection, and radar. application potential. [0003] There are two main methods of realizing microwave photonic filters: multi-tap delay line method and sideband filter method. The multi-tap delay line method is to divide the optical carrier of the modulated electrical signal into N parts (taps), each of which is weighted and delayed differently by photon signal processing, and then the N signals are passed through coherent or non-coherent Combined together in a way, and finally beat o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20
CPCH01P1/2005
Inventor 郑狄潘炜罗斌邵理阳
Owner SOUTHWEST JIAOTONG UNIV
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