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根据平面光波导损耗的波动理论,通过分析计算,对于传播损耗随波膜厚度的变化关系提出了新的看法,文中给出了一组以波导膜厚度为参变量的传播损耗曲线,说明在某些波导膜厚度范围内,不能有效地进行光波导传播。 相似文献
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在光电子技术,计算机技术,通信技术迅速发展的今天,光波导材料和器件得到了越来越多的应用和发展.因此,对于光波导器件现状及发展趋势的叙述,不但对有志于在此方面研究的人具有一定参考价值,同时也是面向未来光电子产业发展的必然要求.因为当今大多器件应用平面光波导材料,所以主要对平面光波导理论进行了讨论. 相似文献
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通过对光无源器件中的平面光波导分路器生产过程中预先对使用的尾纤保护管进行收缩处理及产品结构设计考虑尾纤保护管的收缩后,在高低温循环试验中的温度特性研究,给平面光波导分路器设计及生产提供一种新的方向。 相似文献
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Characteristics of titanium indiffused waveguides in lithium niobate have been investigated. The effects of diffusion time, temperature, and ambient atmosphere on mode structure, surface refractive index, and profile, waveguide depth, surface morphology, and composition are described. Similarities and discrepancies between these and any previously published results are discussed and mechanisms for new features proposed. The necessity for fabrication in an oxygen atmosphere at elevated temperatures is demonstrated, and directions for further investigation indicated. 相似文献
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Si基槽型光波导的传输特性分析和传输损耗的测量 总被引:3,自引:3,他引:0
对Si基槽型(slot)光波导的传输特性进行了研究。 采用三 维时域有限差分(3D-FDTD)法研究了芯层中的光功率与波导槽型宽度及Si条带宽度之间的关 系,结果显示,槽型光波导具有很好的光功率约束效率,可以达到30%以上; 分析了光功率的变化规律及其优化,综合考虑光功率和光功率密度确定波导结构参数,实现 最佳光功率分 布,横向光功率分布沿x轴方向具有很好的约束效果,沿y轴方向呈现高斯分布;分析了底部Si薄层对光 功率的影响,100nm的底部Si薄层使得芯层的光功率下降50%,减小 底部Si薄层厚度有利于光功率约束效 率的提高;采用电子束刻写(EBL)技术和等离子刻蚀(ICP)技术制备了Si基槽型光波导,实验 研究了其传输损耗,结果显示,槽型光波导具有较低的传输损耗,达到13.5dB/cm。 相似文献
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Wet-etched ridge waveguides in y-cut lithium niobate 总被引:2,自引:0,他引:2
Rei-Shin Cheng Tzyy-Jiann Wang Way-Seen Wang 《Lightwave Technology, Journal of》1997,15(10):1880-1887
By the technique of nickel indiffusion proton exchange (NIPE) and the technique of buffered proton exchange (PE) melt, wet-etched ridge waveguides in y-cut LiNbO3 are fabricated for the first time. The fabricated ridge waveguides have smooth surfaces and are good enough for low-loss waveguides. Moreover, a ridge waveguide Mach-Zehnder modulator in y-cut LiNbO3 is fabricated. The measured half-wave voltage is about 30% lower than that of a conventional modulator. The wet-etched ridge waveguides in y-cut and z-cut substrates are also characterized for comparison 相似文献
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We describe the fabrication of a broad stripe optical wave-guide in z-cut lithium niobate by electric-field-assisted thermal proton exchange in a benzoic acid melt. Electric fields of 5 × 104V/m to 105V/m were laterally applied by means of in-contact gold thin-film electrodes 1 mm apart, producing an asymmetric depth across the width of the stripe. Similar vertical fields, applied across the thickness of the wafer, increased the stripe depth in the region of applied field. Refractive index profiles are given for both cases. 相似文献
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The fabrication of proton exchanged monomode optical waveguides on Y-cut lithium niobate is reported. Molten benzoic acid is used, but damage of the crystal surface is avoided. 相似文献
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Ling Liao Desmond R. Lim Anuradha M. Agarwal Xiaoman Duan Kevin K. Lee Lionel C. Kimerling 《Journal of Electronic Materials》2000,29(12):1380-1386
Signal propagation delays dominate over gate delays in the ever-shrinking ultra large scale integrated (ULSI) circuits. Consequently,
silicon-based monolithic optoelectronic circuits (SMOE) with their light speed signal propagation can provide unique advantages
for future generations of microprocessors. For such SMOE circuits, we need optical interconnects compatible with silicon technology.
Strip waveguides consisting of polycrystalline silicon (polySi) clad with SiO2 offer excellent optical confinement and ease of fabrication that are ideal for such interconnect applications. One major
challenge with using this material system, however, is its insertion loss. In this paper we provide techniques for minimizing
optical transmission losses in polySi strip waveguides. Our previous work using polySi strip waveguides, showed an optical
transmission loss of 15 dB/cm at λ=1.55 μm, which is a communication wavelength of choice in optical fibers because it represents an absorption minimum. Similar
measurements in crystalline silicon strip waveguides1 yielded transmission losses of less than 1 dB/cm. Hitherto, in decreasing loss from 77 dB/cm to 15 dB/cm, we had minimized
loss from surface scattering by improving the film surface morphology, and decreased bulk absorption with hydrogen passivation.
In this paper we report a further reduction in the residual bulk loss from 15 dB/cm to 9 dB/cm. By experimenting with different
waveguide core dimensions, we find that the contribution of bulk loss towards net transmission loss decreases with waveguide
core thickness. Additionally, high temperature treatment provides strain relief in the polySi, decreasing transmission loss.
Annealing in an oxygen ambient is not recommended because it always increases transmission loss. Hydrogen passivation improves
transmission, attributable to passivation of light-absorbing dangling bond defect sites present at polySi grain boundaries.
Together, these methods have resulted in the lowest measured loss value of 9 dB/cm at λ=1.55 μm. Since integrated SiGe and Ge photodetectors are more efficient at shorter wavelengths like λ=1.32 μm, transmission loss is also measured at λ=1.32 μm. Losses at the two wavelengths (1.32 μm and 1.55 μm) are similar when defects and stress in the waveguides are minimized. 相似文献