摘要
提出了一种能够实现任意滤波形状的高分辨率可重构微波光子滤波器方案。利用可编程光滤波器完成抽头系数的独立灵活配置,配合使用相干探测技术实现滤波器的正负抽头,从而可以完成滤波形状的任意可重构。研究表明一个大梳齿数量的平坦光频梳被作为光源可提高抽头数量,从而实现高分辨率的滤波器的重构。除此之外,通过预先引入色散,响应中的杂散也被有效地抑制。经仿真验证,该滤波器具有93 MHz的高分辨率,杂散抑制40 dB以上,创新性地构造了具有不同中心频率的低通、带通、高通、带阻滤波器,以及矩形、高斯形、sinc形等任意滤波形状,对于后续微波光子滤波器的研究起到了引导性作用。
Objective Microwave photonic filter is one of hot research topics in recent years due to their ability to achieve high bandwidth,anti-electromagnetic interference,fast tunability and reconfigurability with the advantage of optical devices.In order to realize the flexible reconfiguration of the filter response,the response can be flexibly configured by constructing a finite impulse response filter in the optical domain,where the taps can be flexibly configured.Optical frequency combs are capable of providing a larger number of combs as filter taps and are now widely used.A large number of combs allow for more taps,implying a larger quality factor and a larger time bandwidth product,which also allows for higher frequency resolution.However,in optical frequency comb-based filter schemes,simply having a large number of taps are not enough to achieve arbitrary reconfigurability of the filter shape.It is well known that positive coefficient tapped finite impulse response filters can only achieve a low-pass response,whereas bandpass,high-pass or more complex waveforms require the introduction of negative coefficients in the taps.With the help of programmable waveshaper to differentially control different combs of the optical frequency comb in the optical domain,combined with optical devices such as photodetectors,filters with positive and negative coefficients can be realized.In addition,in the process of realizing the response,the beat frequency between the comb lines of the optical frequency comb introduces unwanted spuriousness.Therefore,the operating frequency of existing optical comb-based microwave photonic filter schemes must be strictly limited to a single"Nyquist zone,"which undoubtedly limits the operating frequency range of the filter.By introducing proper pre-dispersion,this spurious signal can be effectively suppressed and the operating frequency range of microwave photonic filter can be expanded.Methods A high-resolution reconfigurable microwave photonic filter scheme based on optical frequency comb is pro
作者
王敬雯
尹子恺
尹飞飞
戴一堂
Wang Jingwen;Yin Zikai;Yin Feifei;Dai Yitang(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第10期149-157,共9页
Infrared and Laser Engineering
关键词
微波光子学
微波光子滤波器
相干探测技术
可重构
高分辨率
杂散干扰抑制
microwave photonics
microwave photonic filter
coherent detection technology
reconfigurability
high resolution
spurious interference suppressing
