A microwave photonic band-stop filter based on microring and Mach-Zehnder interference structure

Abstract

The invention discloses a microwave photonic band stop filter based on a Microring-Mach Zehnder interference (MR-MZI) structure, which comprises a semiconductor laser, a polarization controller, a phase modulator, an optical band pass filter, an MR-MZI integrated optical filter unit and a photoelectric detector. Narrow bandwidth filter is realized through adjusting the coupling interval between microring resonators in the MR-MZI integrated optical filter unit; through adjusting the bias voltage of each heating electrode in the MR-MZI integrated optical filter unit, the amplitude and the phase of signals are regulated; the amplitude response and the phase response of the microring are used for being combined with the MZI structure in the MR-MZI integrated optical filter unit to generate fully destructive interference, and an ultra high inhibition ratio is realized. According to the microwave photonic band stop filter provided by the invention, on the basis of the narrow bandwidth, the ultra high inhibition ratio is realized, and the microwave photonic band stop filter performance is improved.

Description

technical field [0001] The invention belongs to the field of optics and microwave technology, and more specifically relates to a microwave photon band-stop filter based on a microring and Mach-Zehnder interference structure. Background technique [0002] Microwave photonic filter is a microwave photonic system that uses optical methods to process microwave signals and realize filtering functions. Compared with traditional electrical filters, microwave photonic filters use photonic devices to process microwave signals in the optical domain, and have the advantages of large bandwidth, low loss, small size, light weight, and anti-electromagnetic interference, which can effectively overcome electronic bottlenecks. In addition, good tunability and reconfigurability are another outstanding advantages of microwave photonic filters. In recent years, microwave photonic filters are developing from discrete devices to integrated devices, thereby reducing costs, reducing volume, and ac...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the microring itself, when using the straight-through end of the microring resonator to form a microwave photonic band-stop filter, its extinction ratio and bandwidth cannot be optimized at the same time, and it is often necessary to seek a compromise value in the design and manufacture, thus limiting this. The bandwidth and rejection ratio of such devices lead to bandwidth generally in the GHz order, and the rejection ratio is generally less than 30dB

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