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Ultra-broadband tunable microwave photon filter based on high-birefringence pohotonic crystal fiber and fiber loop

A photonic crystal fiber, high birefringence technology, applied in instruments, optics, nonlinear optics, etc., can solve the problem that microwave photonic filters cannot achieve tunable characteristics and high Q value at the same time, and achieve simple structure and dynamic response range. Large, mature production technology

Inactive Publication Date: 2016-12-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing microwave photonic filters cannot realize tunable characteristics and high Q value at the same time

Method used

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  • Ultra-broadband tunable microwave photon filter based on high-birefringence pohotonic crystal fiber and fiber loop

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Embodiment

[0018] attached by figure 1 It can be seen that the present invention is composed of a multi-wavelength laser 12 with tunable wavelength spacing, a phase modulator 15 , a single-mode optical fiber 17 , a photodetector 20 , and a spectrum analyzer 21 . After the multi-wavelength light source produced by the multi-wavelength laser 12 is output from the output port, the RF signal output by the phase modulator 15 and the analog signal generator 16 is modulated, passed through the single-mode fiber 17 and delayed by a 3dB coupler 18 and a tunable fiber Delay occurs in the optical fiber ring formed by the line 19, and reaches the photodetector 20 for photoelectric conversion, and the electrical signal output by the photodetector 20 enters the spectrum analyzer 21 for analysis.

[0019] The multi-wavelength laser 12 includes a pumping light source 1, and pumps a section of erbium-doped fiber 3 through a wavelength division multiplexer 2; includes an optical isolator 5 for ensuring un...

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Abstract

The invention discloses an ultra-broadband tunable microwave photon filter based on a high-birefringence pohotonic crystal fiber and a fiber loop. The ultra-broadband tunable microwave photon filter is mainly composed of a wavelength interval tunable multi-wavelength laser and the fiber loop. The multi-wavelength fiber laser serves as a light source, and HB-PCF has different birefringences by changing the surrounding temperature of the HB-PCF filled with temperature-sensitive liquid. With continuous change of the birefringence of the HB-PCF, the laser outputs laser light different in wavelength interval, so that the passband center frequency of the microwave photon filter is tunable. The frequency selectivity of the filter is effectively improved by introducting the fiber loop. The microwave photon filter has the advantages of being simple in structure, mature in operating technology and low in cost, the problem that an existing microwave photon filter based on broadband light source cutting is small in turning range and cannot be turned continuously is solved, and the ultra-broadband tunable microwave photon filter is suitable for the fields of national defense, industrial production and civil use.

Description

technical field [0001] The invention belongs to the technical field of microwave photon filtering, and in particular relates to a microwave photon filter capable of adjusting the center frequency of a passband by changing the wavelength interval of a light source. Background technique [0002] The microwave photonic filter can not only realize the function of the digital electronic microwave filter to pass the useful microwave signal smoothly and suppress the useless noise signal, but also can realize the direct processing of the radio frequency signal in the optical domain. Microwave photonic filters have the characteristics of high bandwidth, low loss, anti-electromagnetic interference, light weight and support for high sampling frequency in radio frequency systems, so they are widely used in various fields. At present, research work in various countries is mainly focused on designing new microwave photonic filter structures to achieve negative and complex tap coefficients...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
CPCG02F1/0147
Inventor 曹晔杨菁芃童峥嵘
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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