Microwave photonic transversal filter based on single-wavelength and multimode fiber delay line modules

Abstract

The invention provides a microwave photon transversal filter based on a single-wavelength and multimode fiber delay line module, which belongs to the field of microwave photonics. The core part of the filter is an optical delay line module based on a single optical wavelength and a single multimode fiber, which combines the technical advantages of coherent and non-coherent systems. The optical delay line module is constructed using a single optical wavelength in the coherent system and a multimode fiber in the incoherent system. The single optical wavelength reduces the cost and simplifies the system. The multimode fiber not only provides modal The time delay, and the spatial wavelength division multiplexing delay line structure provided by it eliminates the optical coherence phenomenon, and has high resolution and flexible frequency response. Relying on the mechanical slit, the incident angle of the light beam entering the multimode fiber can be adjusted to realize the tunable characteristic of the filter tap. The filtering experiment of the filter shows that the wave limiting rejection ratio of the present invention reaches more than 30dB, and the stability is good.

Description

Microwave Photonic Transverse Filter Based on Single Wavelength and Multimode Fiber Delay Line Modules technical field The present invention relates to microwave photonic filter technical field, be specifically related to a kind of delay based on single wavelength and multimode fiber Microwave Photonic Transverse Filter for Line Modules. Background technique [0002] Microwave photonics combines microwave and photonics, and thus integrates the advantages of microwave and photonics. Transparent conversion between RF waves and fiber, microwave provides low-cost mobile wireless connectivity, and fiber provides low-loss Broadband connection without electromagnetic interference. Microwave photonic filter is an optical subsystem that utilizes optical method to process microwave signal and realize filtering function. system. As a key technology in microwave photonics, microwave photonic filters are mainly used to replace traditional methods to process Radio frequency sig...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the technical defects of the prior art, and provides a microwave photon transversal filter based on a single-wavelength and multimode fiber delay line module, so as to solve the technical problems of low resolution and poor stability of conventional microwave photon filters

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