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1.
Hybrid Si-LiNbO? electro-optic tunable ring resonators have been proposed and demonstrated as a path to achieving ultracompact and high-speed electro-optic devices. Free standing single crystal LiNbO? microplatelets (~mm long and ~1 μm thick) were obtained from a z-cut LiNbO? substrate by ion implantation and thermal treatment. The platelets were transferred and thermally bonded on top of Si resonators that were fabricated in a Si-on-insulator platform by a 0.18 μm standard complementary metal-oxide-semiconductor process. For the hybrid microring resonator, a free spectral range of 16.5 nm, a finesse F of ~1.67 × 102, a Q-factor of ~1.68 × 10?, and an effective r coefficient of ~1.7 pm/V were achieved for the TE mode. These values are in good agreement with the calculated results. 相似文献
2.
We design and fabricate a wavelength-selective nonblocking 4 × 4 silicon optical router based on microring resonator for use in future integrated photonic interconnection networks. We successfully demonstrate 12 possible I/O routing paths and present 13 nonblocking operating states, including four broadcasting states, with worst-case extinction ratio and cross talk of 21.05 and -21.56 dB, respectively. Thermal tuning is employed to compensate the resonance shift of microring resonators caused by fabrication errors and adjust the resonance to match the International Telecommunication Unit grid with the channel spacing of 100 GHz. 相似文献
3.
We study the nonlinear phase response of a microring resonator coupled to a bus waveguide and the use of this nonlinear phase
shift to store information in the microring resonator and enhance the switching characteristics of a Mach-Zehnder interferometer
(MZI). By introducing coupling between adjacent microring resonators, the switching characteristics of the MZI can be exponentially
enhanced as a function of the number of microring resonators, when compared to the linear enhancement for uncoupled resonators.
With only a few moderate-finesse microring resonators, the switching power can be reduced to attowatt level, allowing for
photonic switching devices that operate at single-photon level in ordinary optical waveguides.
相似文献
4.
Evanescent field perturbation of an integrated microring resonator is examined as a means of achieving high-fidelity reversible tuning of photonic microcavities over large wavelength ranges. A 1.7% wavelength tuning is achieved through the use of a novel silica fiber probe that provides access to the evanescent field of an air-clad high-index-contrast ring resonator. As the microring is perturbed, the probe-ring distance is found through simultaneous nanometric distance calibration and force measurements. Experimental results agree well with theoretical tuning. Possible microelectromechanical systems implementation of this effect is discussed, as well as avenues for improvement of the tuning range. 相似文献
5.
6.
We demonstrate electro-optic ultrafast control of the optical quality factor of an on-chip silicon microcavity. The micrometer-sized cavity is formed by light confinement between two microring resonators acting as frequency selective mirrors. The ring resonators are integrated into p-i-n junctions enabling ultrafast injection and extraction of carriers. We show tuning of the cavity quality factor from 20,000 to 6,000 in under 100 ps. We demonstrate both high-Q to low-Q and low-Q to high-Q transitions. 相似文献
7.
We present a simple and effective method for the postfabrication trimming of optical microresonators. We photobleach CLD-1 chromophores to tune the resonance wavelengths of polymer microring resonator optical notch filters. A maximum wavelength shift of -8.73 nm is observed. The resonators are fabricated with a soft-lithography molding technique and have an intrinsic Q value of 2.6 x 10(4) and a finesse of 9.3. The maximum extinction ratio of the resonator filters is -34 dB, indicating that the critical coupling condition has been satisfied. 相似文献
8.
We propose a tunable Autler–Townes splitting (ATS) window using the electro-optic effect. The proposed structure includes two cascaded silicon ring resonators side coupled to a straight waveguide. The electro-optic effect is created by a nano-layer graphene located on half of lower silicon ring resonator. Here for the first time, ATS window frequency location is adjusted by utilizing a graphene nano-sheet, so that its wavelength shift is more than 0.24 nm via changing the graphene chemical potential level from 0.445 eV to 0.667 eV. Moreover, we simulate and show the phase changes of the transmission curves around ATS frequency window and their corresponding group delays. Furthermore, switching from slow (fast) to fast (slow) light is another interesting phenomenon of the proposed structure. 相似文献
9.
为得到高矩形度、低旁瓣、电光调谐逆向可导及通带带宽可调的电光可调谐滤波器,在x切y传的钛扩散铌酸锂(Ti∶LiNbO3)波导上,对周期性分布的N级叉指电极组提供分立电压V,产生周期性电场,实现似TE模与似TM模的偏振转换,进而实现滤波功能。该结构构成有限脉冲响应(FIR)网络,网络传输矩阵H(z)与电压V具有一一对应关系。利用z变换原理,运用待定系数法求解H(z),从而推导所需电压值V,实现了电光调谐逆向可导。加入不同电压,可以实现自由光谱范围(FSR)内不同通带宽度的可调谐滤波特性。通过仿真验证,该算法是可行的。当N为17时,边模抑制比(SMSR)可达到25dB。并且滤波曲线的矩形度随着叉指电极组级联级数N的增大而增大。 相似文献
10.
传输矩阵法分析微环谐振器阵列传输特性 总被引:2,自引:1,他引:2
微环谐振器可用作未来高密度、超大规模集成光路的基本构件,其重要发展方向之一是多环化、阵列化,微环谐振器阵列近来成为研究的热点。基于定向耦合器、环形谐振腔、直波导腔的基本单元传输矩阵,建立了用于分析微环谐振器阵列传输特性的传输矩阵模型。讨论了列间距对传输特性的影响,并数值模拟了不同尺度的奇数行和偶数行情况下谐振器阵列的传输特性。结合此传输矩阵模型,讨论了通过改变微环谐振器阵列的尺度以及耦合系数以实现滤波特性改善的方案。最后数值研究了最小尺度微环谐振器阵列传输特性与腔间耦合系数的关系。 相似文献
11.
Yoshiteru Amemiya Tomohiro Tokunaga Yuichiro Tanushi Shin Yokoyama 《Optical Review》2009,16(3):247-251
Electric-field drive optical modulators using a Si ring resonator were fabricated on silicon-on-insulator (SOI) wafers. The
fabricated resonators consisted of Si waveguides with width and thickness of 1.0 and 0.3 μm, respectively. In order to induce
the linear electro-optic (EO) effect in the Si core layer, the strain was applied by covering the layer with Si3N4 film (0.26 μm thick) deposited by low pressure chemical vapor deposition (LPCVD) at 750 °C. The vertical electric-field was
applied to the Si waveguide through the top and bottom cladding layers, and the optical output from the drop port at the resonance
wavelength was measured. At a wavelength of 1501.6 nm, the optical modulation of 33% was obtained at 200V (electric-field
at the silicon surface ∼3 × 105 V/cm, nearly the breakdown field). The resonance wavelength was shifted toward the short wavelength side by applying both
positive and negative voltages, this shift was explained by carrier concentration modulation. The linear EO effect in the
Si core layer was not observed, presumably because the strain in the Si core layer was too small. 相似文献
12.
Splitting of high-Q whispering gallery modes into a doublet of counterpropagating modes was observed in a resonator fabricated from LiNbO(3). An energy-transfer rate of 10 MHz was calculated by measuring the frequency detuning of the doublet structure. The splitting rate is also used to calculate the maximum variation in the internal index of refraction over one wavelength, which is of the order of 10(-7). This shows that the mechanical process used to fabricate whispering-gallery-mode resonators from LiNbO(3) is sufficient to achieve material-limited quality factors. 相似文献
13.
Dong P Liao S Liang H Qian W Wang X Shafiiha R Feng D Li G Zheng X Krishnamoorthy AV Asghari M 《Optics letters》2010,35(19):3246-3248
Fast, compact, and power-efficient silicon microcavity electro-optic modulators are expected to be critical components for chip-level optical interconnects. It is highly desirable that these modulators can be driven by voltage swings of 1 V or less to reduce power dissipation and make them compatible with voltage supply levels associated with current and future complementary metal-oxide-semiconductor technology nodes. Here, we present a silicon racetrack resonator modulator that achieves over 8 dB modulation depth at 12.5 Gbps with a 1 V swing. In addition, the use of a racetrack resonator geometry relaxes the tight lithography resolution requirements typically associated with microring resonators and enhances the ability to use common lithographic optical techniques for their fabrication. 相似文献
14.
提出一种新颖的单片集成双微环耦合的双波长半导体激光器结构。集成于激光腔内的2个微环谐振腔作为模式选择滤波器,通过游标效应选择谐振模式,同时还可作为等效的反射镜面以形成行波腔。这种无需解理的行波激光腔代替了需要解理面的法布里-珀罗驻波腔。理论仿真表明,跟驻波腔结构相比,行波腔双微环激光器结构简单,可获得约34 mA的较低的阈值电流和大于31 dB的边模抑制比。合理地控制有源区的增益峰值和谐振模式分布,该激光器能提供一致性和稳定性较好的双波长激光输出。 相似文献
15.
实验观测到了微环对入射二进制码的格式转换作用, 且这种转换作用对入射光波长具有强烈的依赖关系. 使用线性耦合模理论, 结合傅里叶变换以及电光马赫曾德强度调制作用, 理论再现了这一实验结果, 并通过使用简化的传递函数对此进行了解释. 理论分析还表明, 对于非临界耦合微环, 通过格式转换后波形的非对称性可以直观地判断微环的耦合状态, 即过耦合或欠耦合有不同的输出波形特点.
关键词:
微环谐振器
数据格式转换
耦合模方程
传递函数 相似文献
16.
利用耦合模理论、电光调制理论和微环谐振理论,提出了一个完善合理的聚合物微环谐振器电光开关阵列模型.该器件由1条水平信道、N条竖直信道和N个微环构成,在微环上施加不同方式的驱动电压,可以实现N+1条信道的开关功能.以1×8信道结构为例,在1 550 nm谐振波长下对该器件进行了优化设计和模拟分析.其结果是:微环波导芯的截面尺寸为1.7×1.7 μm2,波导芯与电极间的缓冲层厚度为2.5 μm,电极厚度为0.2 μm,微环半径为13.76 μm,微环与信道间的耦合间距为0.14 μm,输出光谱的3 dB带宽约为0.05 nm,开关电压约为12.6 V,插入损耗约为0.67~1.26 dB,串扰小于-20 dB,开关时间约为11.35 ps. 相似文献
17.
Design and evaluation of an arbitration-free passive optical crossbar for on-chip interconnection networks 总被引:1,自引:0,他引:1
Linjie Zhou Stevan S. Djordjevic Roberto Proietti Dan Ding S. J. B. Yoo Rajeevan Amirtharajah Venkatesh Akella 《Applied Physics A: Materials Science & Processing》2009,95(4):1111-1118
With recent advances in silicon nanophotonics, optical crossbars based on CMOS-compatible microring resonators have emerged
as viable on-chip optical interconnection networks to deliver high-bandwidth communication at low power dissipation with a
small footprint. This paper describes the design, fabrication and evaluation of an arbitration-free passive crossbar based
on a microring resonator matrix that can be used to route wavelength division multiplexing (WDM) signals across the chip.
The salient feature of the proposed design is the ability to support multicasting and many-to-one communication efficiently
(without arbitration), which makes it suitable for implementing cache coherency protocols and on-chip interconnect in future
many-core processors. 相似文献
18.
提出一种紧凑型偏振解复用器, 其中两条常规硅基波导作为输入/输出信号通道, 居于其中的槽式微环谐振腔用于偏振态/波长选择组件. 采用全矢量频域有限差分法详细分析了硅基常规及槽波导的模式特性, 结果发现其横磁模的模场布及其有效折射率相似, 而其横电模相应的特性则差异明显, 结果输入横磁模能够在谐振工作波长下从下路端口输出, 而输入横电模与微环耦合可以忽略, 直接从直通端口输出, 从而实现两偏振态的高效分离. 采用全矢量时域有限差分法详细分析了该偏振解复用器的光波传输特性, 结果表明, 当微环半径为3.489 μm时, 在1.55 μm工作波长下, 横磁模与横电模的消光比与插入损耗分别为 ~ 26.12 (36.67) dB与 ~ 0.49 (0.09) dB. 另外, 论文详细讨论了器件关键结构参数的制作容差, 并给出了输入模场在器件中的传输演变情况. 相似文献
19.
Heebner JE Lepeshkin NN Schweinsberg A Wicks GW Boyd RW Grover R Ho PT 《Optics letters》2004,29(7):769-771
We have constructed and characterized several optical microring resonators with scale sizes of the order of 10 microm. These devices are intended to serve as building blocks for engineerable linear and nonlinear photonic media. Light is guided vertically by an epitaxially grown structure and transversely by deeply etched air-clad sidewalls. We report on the spectral phase transfer characteristics of such resonators. We also report the observation of a pi-rad Kerr nonlinear phase shift accumulated in a single compact ring resonator evidenced by all-optical switching between output ports of a resonator-enhanced Mach-Zehnder interferometer. 相似文献
20.
设计了一种基于LiNbO_3的长周期波导光栅可调谐耦合器.该耦合器利用长周期光栅的独有特性将输入波导的导模经包层模耦合至输出波导导模.由于LiNbO_3的电光效应,波导光栅芯层与包层的有效折射率随外加电压变化,从而耦合器的谐振波长及耦合效率可由外加电压调谐.分析了光栅周期与耦合器的长度对耦合器带宽和耦合效率调谐范围的影响,以及波导尺寸对谐振波长调谐灵敏度的影响.结果表明光栅周期越短,耦合器长度越长,则耦合器的带宽越窄,耦合效率调谐范围也越大.此外,谐振波长调谐灵敏度随波导宽度的增加而减小,而波导厚度对谐振波长调谐灵敏度的影响可以忽略.对光栅周期为94μm、长度为3.52cm的耦合器进行仿真,结果表明,谐振波长灵敏度为26.2pm/V,3dB带宽可达4.5nm,当外加电压从0变化到200V时,谐振波长变化5.24nm,耦合效率可在1到0.15之间进行调谐. 相似文献