Four-wave mixing based continuously trap wave tunable microwave photonic filter

A technology of microwave photon and four-wave mixing, which is applied in the fields of instruments, optics, nonlinear optics, etc., can solve the problems of small tunable range and non-continuous tunability, and achieve the effect of simple structure, reasonable cost and mature production technology

CN106154590AInactive Publication Date: 2016-11-23TIANJIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-11-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a four-wave mixing based continuously trap wave tunable microwave photonic notch filter. Multi-wavelength laser is generated by four-waving mixing to serve as a light source of the microwave photonic filter to realize a multi-tapping effect. Sidebands and phases of photoelectric current generated after phase modulation control by a waveshaper form trap waves, and phase shift magnitude is introduced additionally to form a complex coefficient to realize continuous tuning of the trap waves. Passband center frequency of output radio-frequency signals of the microwave photonic filter has characteristics of tunable band-reject filter waves, and tunability in trap wave center frequency of the filter is realized according to the phase shift magnitude introduced to optical carriers and modulating signals by the waveshaper. The microwave photonic notch filter has advantages of simple structure, developed operation techniques and low cost, solves problems of small tuning range and failure in continuous tunability of existing phase modulation based microwave photonic notch filters and is applicable to fields of national defense, industrial production and civilian use.
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Description

technical field

[0001] The invention belongs to the technical field of microwave photon filtering, and in particular relates to a microwave photon filter which introduces a phase shift amount to realize tunable notch center frequency. Background technique

[0002] Microwave photonic filter is an important branch of microwave photonics. It modulates the input radio frequency (RF) signal to the optical signal through the modulator, processes the RF signal in the optical domain, and finally outputs the filtered microwave through the optical receiver. Signal. Using this method has the advantages of low loss, high bandwidth, immunity to electromagnetic interference, light weight, and high sampling frequency. These significant advantages make microwave photonic filtering systems a hot technology in broadband radio frequency signal processing and attract international attention. In recent years, researchers have conducted in-depth research on it, and have obtained many experimenta...

Examples

Embodiment

[0019] A continuously tunable notch microwave photonic filter based on four-wave mixing, such as figure 1 As shown, the filter includes: Multi-wavelength Light Source (Multi-wavelength Light Source) 1, 1:99 coupler (Coupler2) 2, polarization controller (PC) 3, optical spectrum analyzer (OSA) 4, phase modulator ( PM) 5, analog signal generator 6, erbium-doped fiber amplifier (EDFA2) 7, wave shaper (Waveshaper) 8, 5km long single-mode fiber (SMF) 9, photodetector (PD) 10, spectrum analyzer 11 Wherein the multi-wavelength light source 1 consists of two tunable lasers (Tunable Laser1, Tunable Laser 2) 12, 13, a 50:50 coupler (Coupler1) 14, an erbium-doped fiber amplifier (EDFA1) 15, 2km long High nonlinear fiber (HNLF) 16 and optical filter 17 are composed.

[0020] Such as figure 1 As shown, the optical path transmission of the present invention when realizing the tunable microwave photonic filter is: based on the multi-wavelength light source 1 generated by four-wave mixing, t...