硅基可重构多通道Nyquist滤波器及应用

It is very essential to achieve an integrated reconfigurable Nyquist filter to generate and receive signals for high spectrum efficiency optical communication systems, which is becoming more and more urgent because of the increasing development of 5G technology. The applicant proposes three silicon-based reconfigurable Nyquist filter structures with flat-top passband, roll-off factor of 8%, tunable free spectral range, operation wavelength, passband bandwidth, passband and stopband bandwidth ratio, and generate/receive multiple channels simultaneously. Therefore, this project is going to focus on the silicon-based high performance reconfigurable multi-channel Nyquist filters and their applications. The following five subjects will be included. (1) The design of ultra-large free spectral range, low insertion loss, high heater efficiency Nyquist filter; (2) The design of reconfigurable Nyquist filter; (3) The design of high-performance multi-channel Nyquist filter; (4) Fundamental investigation low loss silicon waveguide and novel high efficiency heater. (5) The fabrication, characterization and experimental verification of reconfigurable multi-channel Nyquist filters. The goal of this project is to find solutions for reconfigurability of Nyquist filters, enabling a variety of processing functions on signal processing using a single device. In this project, low-loss, high-efficiency reconfigurable multi-channel Nyquist filters to be designed and fabricated using silicon platform, providing effective methods for all-optical integrated supperchannel transceiver.

如何设计集成可重构光滤波器实现Nyquist信号的产生和接收是实现高频谱利用率光信号传输领域关键问题。随着5G的发展，这个问题显得尤为迫切。申请人提出了三种硅基可重构光滤波器结构，滤波器具有平顶通带，滚降因子8%；可调自由光谱、中心波长、通带带宽、通阻比值；同时可产生/滤出多路信道的特性。本项目拟围绕“硅基可重构多信道Nyquist滤波器及应用”的主题，具体开展：(1)研制超大自由光谱、低插入损耗、高热调效率Nyquist滤波器；(2)研制可重构Nyquist滤波器；(3)研制高性能多信道Nyquist滤波器；(4)低损耗硅基纳米制备工艺和高效率新型电极的研究；(5) Nyquist滤波器芯片的制作，测试和实验验证。着重解决Nyquist滤波器可重构性，实现一片多用的功能。研制出低插损、高效率、可重构、多信道硅基Nyquist滤波器，为实现片上全光超通道收发机机提供有效途径。

可重构多路方形光滤波器(OMF)是实现高频谱效率多载波收发器的关键器件。然而，迄今为止报道的大多数集成OMF都难以满足高光谱分辨率，低器件复杂度和可拓展的输入/输出端口。在本项目中，我们在硅基平台上利用微环谐振腔辅助的离散傅里叶干涉仪(DFT)结构设计了一个10GHz间隔的方形OMF，通过自适应算法实现器件的重构。该器件采用了超低损耗的加宽光波导和低相位误差的马赫-曾德光开关，具有超低损耗，低功耗，多端口可拓展性和GHz频谱带宽等优点。另外，该多路滤波器能够实现多种频谱响应的切换，例如方形形状和sinc函数形状。在此基础上，本项目还提出了一种有效的自配置方法来实现可编程多路滤波器，通过自动优化所有调谐元件的设置，可以获得不同的光谱响应，展示了具有自配置功能的片上可编程GHz带宽多路滤波器的巨大潜力。