基于微环谐振器的超紧凑微波光子滤波器的设计

设计了一个基于硅基微环的超紧凑的微波光子滤波器,用以提高硅基微波光子器件的集成密度及增大其自由光谱范围。根据波导光学的耦合模理论,推导出双环并联谐振器的光强传递函数,并通过仿真得到了微波光子滤波器的输出特性。结果表明:当微环半径为0.79 m时,谐振器中直波导宽度为0.3 m,环形波导宽度为0.25 m,滤波器的自由光谱范围为140 nm,插入损耗为0.5 dB,半峰全宽为7 nm,此滤波器的性能完全满足粗波分复用系统的要求。     

基于级联微环谐振器的集成化可重构光学上下路插分复用器

We report on an eight-channel reconfigurable optical add-drop multiplexer based on cascaded microring resonators with a high tuning power consumption and a compact footprint. Microheaters are fabricated on top of the microring resonators and can be modulated using the thermo-optic effect to achieve the reconfigurable functionality of the device. We demonstrate the reconfigurable add-drop multiplexing functionality for channel spacings of 100 GHz and 50 GHz, with the centre wavelengths of the channels aligned to International Telecommunication Union grid specifications. The crosstalk for channel spacings of 100 GHz and 50 GHz are less than..22:5 dB and..15:5 dB, respectively. The average tuning efficiency is about 4.5 mW/nm, and the response speed is about 13.0 kHz.     

Slow light in silicon microring resonators

This paper experimentally investigated slow light effect in cascaded silicon-on-insulator (SOI) microring resonators.Double channel and single channel sidecoupled integrated spaced sequence of resonators (SCISSOR) devices were fabricated with electron beam lithography and dry etching technology.The delay performances of the SCISSOR devices were demonstrated using non-return-to-zero (NRZ) and return-to-zero (RZ)signals at different bit rates.Group delays and bandwidths of cascaded microrings are significantly enhanced compared with single microring.     

Parallel-cascaded semiconductor microring resonators for high-order and wide-FSR filters

We demonstrate an optical channel dropping filter (OCDF) using three parallel-cascaded vertically coupled microrings with improved rolloff, bandpass flattening, and wide free spectral range (FSR) compared to a single-ring OCDF using single-mode tightly confined waveguides in both GaAs-AlGaAs and GaInAsP-InP. We achieve FSRs of 30 nm for GaAs-AlGaAs and 40 nm for GaInAsP-InP devices, which are three and four times greater, respectively, than those for single rings. The rolloff is 2.8 times faster than that for a single ring.     

基于光学微环的化学传感器

以SiN为材料,采用与CMOS工艺相兼容的技术,制备了波导宽度为1μm,半径为400μm的SiN光学微环。经测量,其品质因数(Q值)高达20 000,自由光谱范围(FSR)为0.5 nm。提出了采用光学微环传感器、单波长光源和光功率计对待测物进行测量的方案。实验证明,该方案与传统的采用光谱仪测量谐振峰值漂移的方法相比,可以取得更高的系统探测灵敏度。最后,利用微环传感器对葡萄糖溶液浓度进行测量,灵敏度高达10-4折射率单元(RIU),证明了该传感器可以应用于溶液检测领域。     

Four-channel switched microwave filter based on optical ring resonators

A four-channel switched microwave filter was demonstrated incorporating a switched optical resonator, which is constructed by integrating a 1 x 4 space switch with arrayed ring filters featuring different free spectral ranges. The four channels centred at 10, 16, 18 and 20 GHz were individually selected to provide a bandpass filtering via the control voltage applied to the switched resonator.     

Free-standing all-polymer microring resonator optical filter

Free-standing all-polymer microring resonator optical filters as prototypical elements in flexible integrated lightwave circuits are demonstrated. The fabrication and measurement methods are discussed. The measured spectrum shows good agreement with theoretical expectations. The crucial 'critical' coupling condition is achieved, resulting in a measurement limited -27 dB extinction of the filter output on resonances     

Deep glass etched microring resonators based on silica-on-silicon technology

Microring resonators fabricated on silica-on-silicon technology using deep glass etching are demonstrated. The fabrication procedures are introduced and the transmission spectrum of a resonator is presented.     

SoI基微环谐振可调谐滤波器

采用电子束光刻和ICP刻蚀等工艺制作出绝缘体上Si(SoI)基纳米线波导微环谐振(MRR)滤波器,波导截面尺寸为300 nm×320 nm,微环半径为5 μm.测试结果表明,器件的自由频谱宽度(FSR)为16.8nm,1.55μm波长附近的消光比(ER)为18.1 dB.通过对MRR滤波器进行热光调制,在21.4～60...     

基于两个级联微环谐振器的电光导向光学译码器

实现了一种基于两个级联微环谐振器的导向光学译码器,器件利用等离子色散效应调制微环谐振器。制作工艺误差引起的两个微环谐振器谐振波长不一致可以通过微环谐振器上热极进行补偿。码型发生器产生的两个电学信号驱动微环谐振器的PIN结,由四个输出端口的光学信号给出译码结果。通过对器件的静态光谱分析得到工作波长和驱动电压。最终实现了100Mbps的动态译码结果。     

基于FPGA高阶FIR滤波器的实现

从FIR数字滤波器的基本结构模型出发,分析了FIR滤波器的设计思路及具体实现方法,详细介绍了FIR滤波器的分布式算法（DA）结构。通过分析计算,得到普通DA结构实现高阶滤波器会消耗大量的查找表资源,这样的资源消耗甚至令硬件资源不可接受。针对普通DA的不足,提出了改进型DA结构。并利用FPGA仿真软件分别对64阶FIR带通滤波器的两种改进型DA结构进行仿真,结果表明改进型DA结构所消耗的资源大幅度降低。从而验证了改进型DA结构在降低运算资源和提高性能等方面的优越性。     

Thermal effect analysis of silicon microring optical switch for on-chip interconnect

The silicon microring resonator plays an important role in large-scale, high-integrability modern switching matrixes and optical networks, as silicon photonics enables ring resonators of an unprecedented compact size. But as the nature of resonators is their sensitivity to temperature, their performances are vulnerable to being affected by thermal effect. In this paper, we analyze the dominant thermal effects to the application of silicon microring optical switch. On the one hand we theoretically analyze and experimentally measure the thermal crosstalk among adjacent microring optical switches with different distances, and give possible solutions to minimize the affect of thermal crosstalk. On the other hand we analyze and measure the thermooptic dynamic response of microring switch; the experiment shows for the thermal-tuning that the rising edge is around 2μs, and the falling edge is around 35μs. We give the explanation of the asymmetric rise-time and fall-time.     

All-optical nonlinear switching in GaAs-AlGaAs microring resonators

In this paper, we demonstrate all-optical nonlinear switching in compact GaAs-AlGaAs microring resonators at the 1.55-μm wavelength. Switching is accomplished in the pump-and-probe configuration in which the pump-and-probe signals are tuned to different resonance wavelengths of the microring. Refractive index change in the microring due to free carriers generated by two photon absorption is used to switch the probe beam in and out of resonance. Measured transient responses of the pump and probe through the microring show good agreement with theoretical predictions based on nonlinear pump-probe interaction due to two photon absorption     

基于介质环谐振器的集成多频段滤波器的设计

多频段射频通信采用集成的多频段带通滤波器,该滤波器以环形谐振器为基础,如同心圆介质环形谐振器。通过使用同心环结构构造多频带通滤波器,大大降低了在多频带运行的多滤波器对印刷电路板(PCB)的实际需求。基于同心圆谐振器的多频带通滤波器的各种配置为移动设备的多频带移动设备的布局设计和制造提供了灵活性。这些同心圆谐振器的配置可以包括但不限于槽耦合配置、直接耦合配置和嵌入式直接耦合配置。在封装技术中具有重要作用。     

A compact tunable metamaterial filter based on split-ring resonators

A tunable metamaterial filter is designed based on split-ring resonators (SRRs) in this paper. The metamaterial filter has a compact size of 15 mm×20 mm, and miniaturization is realized by using the SRRs. By loading tunable devices, the continuous operation of the filter is realized at X band (from 10.7 GHz to 12 GHz), the bandwidth is about 13%, the minimum return loss is 35 dB, and the maximum insertion loss is 0.37 dB. The results illustrate that the metamaterial filter shows the compact size, wide bandwidth and good band pass characteristics. This work has been supported by the Key Laboratory Foundation of China Electronics Technology Group Corporation (No.ZX15ZS391), the National Fund for International Cooperation in Science and Technology (No.2014DFR10020), and the Natural Science Foundation of Shanxi Province (Nos.2014021020-1 and 2015021083). E-mail:798710363@qq.com      

Very high-order microring resonator filters for WDM applications

High-order microring resonators having from 1 to 11 coupled cavities are demonstrated. These filters exhibit low loss, flat tops, and out-of-band rejection ratios that can exceed 80 dB. They achieve performance that is suitable for commercial applications.     

Vertically coupled microring resonators using polymer wafer bonding

A new technique is presented to make vertically coupled semiconductor microring resonators that eases the fabrication process with devices more robust to ring-to-waveguide misalignments. Single-mode microring optical channel dropping filters are demonstrated for the first time in this configuration with Qs greater than 3000 and an on-resonance channel extinction greater than 12 dB. A 1×4 multiplexer/demultiplexer crossbar array with second-order microrings was also made and exhibited channel-to-channel crosstalk lower than 10 dB     

谐振微环对MZI型interleaver滤波特性改善的分析

作为新兴的群组滤波技术,interleaver技术与传统的DWDM技术相结合,可以在不增加新光纤及器件技术难度的基础上使原有DWDM系统的复用波长数增加一倍.耦合一个谐振微环到光纤熔锥型非平衡马赫一曾德尔干涉仪型波长交错滤波器系统中,利用微环的相位引入改善交错滤波器的响应函数,选择适当的微环耦合角,使其带通平坦性和阻带...     

Interleave filter based on coherent optical transversal filter

The principle of the transversal interleave filter previously proposed as a novel class of interleave filter is described. The principle of a conventional 1 /spl times/ 1 coherent optical transversal filter is reviewed. Then, the fundamental operating principle and the three design conditions required for the novel interleave filter are explained. As examples, three types of filter design, namely 1) a general/transposed design; 2) an asymmetric design; and 3) a symmetric design, are presented, and their interleave filter characteristics are discussed. The designed interleave filters with a free spectral range of 100 GHz was fabricated using silica-based planar lightwave circuit (PLC) technology. The asymmetric design achieved a wide 3-dB passband width of 55 GHz, whereas an ordinary lattice-form interleave filter could not realize a 3-dB passband width larger than 50 GHz because of the halfband property. A small polarization-dependent wavelength shift of 0.01 nm is demonstrated by inserting a single half waveplate in the middle of the circuit. The general/transposed and symmetric designs realized a practical interleave filter with a boxlike transmission spectrum and low chromatic dispersion. The two-stage interleave filter formed by cascading the general and transposed designs has the advantages of a low crosstalk of less than -46 dB and a wide 20-dB stopband width of 40 GHz, whereas the single-stage symmetric design has an extremely small chromatic dispersion of within /spl plusmn/5 ps/nm. In addition, the design concept to realize a 1/spl times/N transversal interleave filter is extended.     

Study of a novel pressure sensor based on optical microring resonator

We propose a novel pressure sensor based on the combination of the ring resonator with two straight waveguides and a two-end fixed beam. The principle of this device is acquiring the system static pressure by monitoring the changes in the transmission wavelength shift of the ring resonator with double waveguides. The numerical results show that the sensitivity of the system is up to 49.3 pm/kPa while the pressure range is 0--300 kPa. The thickness of the fixed beam is an important factor which impacts the sensitivity of the system. This device can provide support for fabricating high sensitivity and low cost micro pressure sensors.