Microwave photon filter based on few-mode fiber bragg grating

Abstract

The invention discloses a microwave photon filter based on a few-mode fiber bragg grating, which belongs to the field of microwave photonics and consists of a laser, an electro-optical modulator, a few-mode fiber bragg grating delay line module, a few-mode fiber circulator, a photon lantern, a beam combiner, a photoelectric detector and a vector network analyzer. The few-mode fiber bragg grating delay line module is the core part of the filter. According to the delay line, a mode division multiplexing technology is adopted, a mode dimension is used as a multiplexing channel under a single signal wavelength, cascade Bragg gratings are excited in different modes in a few-mode fiber, and the delay line is formed by controlling the distance between the gratings. The multi-tap, high-frequency,large-bandwidth, low-loss and high-stability filter is realized by using the few-mode fiber bragg grating delay line, the defect that the cost of a multi-wavelength light source and a laser array is high due to the fact that a traditional microwave photon filter uses a wavelength division multiplexing technology is overcome, the integration level of the system is greatly improved, and the system cost is reduced.

Description

technical field [0001] The invention belongs to the field of microwave photonics, in particular to a microwave photon filter based on a few-mode fiber Bragg grating. Background technique [0002] With the continuous development of communication technology and real-time audio, video and other communication methods, the channel bandwidth requirements continue to increase, and the carrier frequency has evolved from microwave to millimeter wave. The increase of the signal frequency increases the transmission loss of the link, which limits the transmission distance of the signal. Microwave photonics combines microwave systems and optical systems, modulates signals in the millimeter wave band to optical signals, and processes microwave signals in the optical domain, which has the advantages of low loss and strong anti-electromagnetic interference. [0003] In the signal processing subsystem of microwave photonics, microwave photonic filter is one of the key technologies, and has ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex system structure, large volume and high cost caused by the application of laser arrays or multi-wavelength lasers when using microwave photon filters based on wavelength division multiplexing technology. The grating microwave photon filter has the advantages of high stability, simple structure, low cost and high resolution

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