共查询到19条相似文献,搜索用时 93 毫秒
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As2S8玻璃条形波导的光激励法制备技术研究 总被引:8,自引:0,他引:8
为了在As2S8薄膜中制备条形波导,实验研究了As2S8薄膜光致折射率变化和密度变化的现象,采用棱镜耦合、X线衍射和远红外反射光谱等测试技术,确认了As2S8薄膜经紫外光辐照后薄膜密度增高、折射率增大的现象。采用可见光吸收谱测试技术,确认了经紫外光辐照的As2S8薄膜不发生黑化现象。在归纳了实验规律的基础上,提出并采用紫外光激励的方法试制了As2S8条形波导,采用自动调芯端面耦合的方法激励As2S8条形波导的导模,结果显示该波导具有良好的导波特性。 相似文献
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全光逻辑门是全光计算以及全光信号处理系统中关键的光子器件.随着互补金属氧化物半导体(COMS)工艺的发展,基于半导体材料微纳波导全光逻辑门已经成为集成光学领域中的重要方向;尤其是硅基光子集成器件在近些年成为了国际研究热点.文章主要对基于绝缘体上的硅(SOD)和Ⅲ-Ⅴ族化合物材料不同波导结构(马赫-曾德尔干涉仪(Mach-Zehnder interferometer)微环谐振腔和条形波导结构)的全光逻辑门的研究进展进行了介绍,并且在器件的工作速率和功耗方面,分别对上述基于SOI和Ⅲ-Ⅴ族化合物材料三种不同波导结构的全光逻辑门进行了分析和比较. 相似文献
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We propose a new structure containing multimode interference waveguides with partial nonlinear Kerr-like material whose function is like a phase shifter for all-optical logic gates. It has the advantages of compactness and insensitivity to relative phase difference between the incident beams. In this paper, we analyze the structure by finite difference time domain method and demonstrate such logic gates as AND, NOT and XOR logics. 相似文献
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We present a logical design of an all-optical processor that performs modular arithmetic. The overall design is based a set of interconnected modules that use all-optical gates to perform simple logical functions. The all-optical logic gates are based on the semiconductor optical amplifier nonlinear loop. Simulation results are presented and some practical design issues are discussed. 相似文献
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The performances of all-optical logic gates XOR, AND, OR, NOR and NAND based on semiconductor optical amplifier (SOA) have been simulated including the effects of amplified spontaneous emission (ASE). For the parameters used, all-optical logic gates using SOA are capable of operating at speed of 80 Gb/s. 相似文献
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提出了一种新型的基于非线性光纤环镜(NOLM)的可重构全光逻辑门实现方案。传统的基于NOLM的全光逻辑利用自相位调制效应或交叉相位调制效应,透射传输函数重构的自由度低,可实现的逻辑门种类较少。该方案在传统的结构基础上,分析了NOLM中探测光的偏振态的演化,以及输入光偏振态和环内偏振控制器对NOLM的传输特性的影响。理论分析和数值仿真结果表明在考虑NOLM中的非线性偏振旋转效应的情况下,可以更加自由地构建不同透射传输函数,从而利用单一NOLM结构,仅通过调节偏振控制器,即能够可重构地实现绝大部分基础组合逻辑。实验中,完成了两路40Gb/s的数据信号之间的"非"、"与"、"或"、"或非"、"同或"、"异或"等各种基础组合逻辑,验证了方案的可行性。 相似文献
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Daisuke Ishikawa Atsushi Okamoto Satoshi Honma Terumasa Ito Kohei Shimayabu Kunihiro Sato 《Optical Review》2007,14(4):246-251
In this paper, we propose all-optical multifunctional logic gates for image information using photorefractive (PR) two-wave
mixing. The optical setup is simply configured compared with the other all-optical logic gates for image information. The
XOR-, OR-, and AND-operation are all-optically performed in the same optical setup through the transitional response of the
PR medium. One can switch these logic operations simply by means of the on-off control of the signal and the pump beam illumination.
We analyze the spatial distribution of beam intensity in these logic gates using a finite-difference beam propagation method
(FD-BPM) and the crosstalk between adjoining pixels is examined from the result. We also experimentally verify that the XOR-,
OR-, and AND-gates are realized in the same optical setup. 相似文献
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提出了一种新型的基于高非线性光纤(HNLF)中非线性 偏振旋转(NPR)效应的全光逻辑门实现方案. 将两路非归零码数据信号A和B以及一路直流光同时注入HNLF, 光功率变化导致的非线性双折射在两个偏振分量上引入非线性相对相移, 从而导致光信号的偏振态旋转. 在HNLF输出端, 通过波分解复用器和偏振分束器同时滤出数据信号和直流光的正交偏振态, 从而同时实现多种基础组合逻辑, 并可以在同一段HNLF中实现较为复杂的半加器、半减器逻辑功能. 理论分析了信号光在HNLF中的偏振态演化, 以及利用HNLF中的NPR效应同时实现多种全光逻辑门的原理. 并在实验中得到了10 Gbit/s全光信号"与”、"非”、"或”、"同或”、"异或”、"A· B”、"A·B”、半加器、半减器等逻辑功能, 验证了方案的可行性. 相似文献
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In conduction of parallel logic, arithmetic and algebraic operations, optics has already proved its successful role. Since last few decades a number of established methods on optical data processing were proposed and to implement such processors different data encoding/decoding techniques have also been reported. Currently frequency encoding technique is found be a promising as well as a faithful mechanism for the conversion of all-optical processing as the frequency of light remains unaltered after refection, refraction, absorption, etc. during the transmission of light. There are already proposed some frequency encoded optical logic gates. In this communication the authors propose a new and different concept of frequency encoded optical logic gates and optical flip-flop using the non-linear function of semiconductor optical amplifier. 相似文献