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Tunable ultra narrow band microwave photonic band-pass filter

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

Inactive Publication Date: 2017-05-10
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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  • Tunable ultra narrow band microwave photonic band-pass filter
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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 invention relates to the technical field of microwave signal processing, and especially relates to a tunable ultra narrow band microwave photonic band-pass filter. The tunable ultra narrow band microwave photonic band-pass filter comprises an optical fiber coupler, an electro-optic phase modulator, an optical filter, an optical isolator, an optical fiber, an optical circulator and a photoelectric detector, which are orderly connected with each other; the optical circulator comprises a first port, a second port and a third port; the first port is connected with the optical fiber; the second port is connected with the photoelectric detector; the third port inputs a third light source with adjustable power and wave length; a first light source and a second light source are both inputted into the optical fiber coupler; and a radio-frequency signal input end of the electro-optic phase modulator inputs a radio-frequency signal to be filtered, so that the technical effects of tunable broadband, ultra narrow band pass and high out-of-band rejection ratio can be achieved.

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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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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