Reconfigurable integrated microwave photonic band-pass filter

Abstract

The invention discloses a reconfigurable integrated microwave photon band-pass filter, and belongs to the field of microwave photon signal processing. The reconfigurable integrated microwave photon band-pass filter comprises a semiconductor laser for outputting a continuous optical carrier signal; an optical beam splitter is used for splitting the continuous optical carrier signal into two paths of light beams; a microwave optical signal generation module is used for generating a microwave modulation signal and modulating the microwave modulation signal and one path of light beam output by the optical beam splitter to generate a microwave optical signal; a multi-stage cascaded second-order micro-ring filter is integrated, and bandwidth reconstruction and rejection ratio and center frequency tuning are carried out on the generated microwave optical signal; an optical coupler is used for combining the microwave optical signal with the other path of light beam output by the optical beam splitter; a microwave electric signal receiving module is used for converting the combined microwave optical signal into an electric signal and receiving the microwave electric signal. According to the invention, narrow-band filtering can be realized on the basis of a high radio frequency out-of-band rejection ratio, and bandwidth reconstruction of a microwave optical signal in a wide range and flexible tuning of a center frequency are realized.

Description

technical field [0001] The invention belongs to the field of microwave photon signal processing, and more specifically relates to a reconfigurable integrated microwave photon bandpass filter. Background technique [0002] Microwave photonic filters refer to devices that use optical methods and optical components to achieve filtering functions in the microwave frequency band. The biggest difference between microwave photonic filters and traditional microwave filters is that microwave photonic filters process signals in the optical domain. The advantage of this is that optical components have a huge bandwidth advantage and can directly filter high-frequency signals. The filter has good tunability and reconfigurability, and the center wavelength and filtering effect of the filter can be adjusted according to actual needs, and the microwave signal processing in the optical domain also has the characteristics of low loss and anti-electromagnetic interference, so the microwave pho...

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Problems solved by technology

[0003] At present, the development of microwave photonic filters based on discrete devices has been relatively mature, but discrete devices have the disadvantages of large volume, high power consumption, and low stability, and have obvious limitations in practicality, so the current main research direction is Microwave Photonic Filters Based on Integrated Devices

In the prior art, some microwave photonic filters based on integrated devices have the problems of jitter in the filtering area and high insertion loss; in order to solve the problem of flat passband in the microwave photonic filters based on integrated devices, usually the micro The coupling coefficient of the ring is symmetrically designed, but this symmetrical design usually has a great limiting effect on bandwidth tuning

In the prior art, microwave photonic filters based on integrated devices are still deficient in narrow bandwidth, high rejection ratio and high flexibility, and it is difficult to adapt to different filtering performance requirements in various application paths

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