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低驱动、高调制X-Cut铌酸锂电光调制器的优化设计

Optimized Design of Low Driving and High Modulation X-Cut LiNbO3 Electro-Optical Modulator

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摘要

利用定向耦合器代替Y形分支结构,在X-cut铌酸锂(LN)基底上设计了一款具有低驱动电压、高调制参数的马赫-曾德尔(M-Z)型电光调制器。采用有限元法对定向耦合器的原理及影响因素进行了详细分析和精确计算,并对电光调制器的关键结构参数进行了优化。结果表明:光波沿着定向耦合器传播时,能量在两波导中来回交替,呈正弦和余弦函数分布,并且耦合长度随着其间距的增大而快速增大。在调制臂长为3 cm,光波长为1550 nm的情况下,单臂调制所获得的半波电压Vπ为2.22 V,调制参数S21为-51.13 dB。通过对调制臂进行截面分析,给出了电场Ex分量、电位移矢量Dx分量和光模分布,并求得重叠积分因子为0.486。同时还表明脊形波导结构有利于提高电光作用效率。当脊高为1 μm时,重叠积分因子为0.714,相较于平板波导,其电光重叠积分因子提高了46.91%。

Abstract

A Mach-Zehnder (M-Z) electro-optical modulator with low driving voltage and high modulation parameters is designed on the X-cut Lithium Niobate (LN) substrate by using a directional coupler instead of traditional Y-shaped branch structure. The working principle and major factors of directional coupler are analyzed and calculated precisely by the finite element method. The major structural parameters of the electro-optic modulator are optimized. The results show that when the light wave propagates along the directional coupler, the energy is alternated back and forth in the two waveguides with a distribution of sine and cosine functions. At the same position, the coupling length increases rapidly with the increase of the gap. When the electro-optical modulation arm length is 3 cm and the optical wavelength is 1550 nm, the half-wave voltage Vπ obtained by the single-arm modulation is 2.22 V and the modulation parameter S21 is -51.13 dB. With the section analysis of modulation arms, the electric field Ex component, the electric displacement vector Dx component and the optical mode distribution are given, and the integral overlap factor is 0.486. It also shows that the ridge waveguide structure can effectively improve the electro-optic efficiency. When the ridge height is 1 μm, the overlap integral factor is 0.714, and the electro-optical overlap integral factor of it is 46.91% higher than the slab waveguide.

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中图分类号:TN256

DOI:10.3788/aos201838.0713001

所属栏目:集成光学

基金项目:国家自然科学基金青年科学基金(61505241)

收稿日期:2018-01-11

修改稿日期:2018-02-01

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梁凤超:山东理工大学物理与光电工程学院, 山东 淄博 255000中国科学院苏州纳米技术与纳米仿生研究所国际实验室, 江苏 苏州 215123
李敏:中国科学院苏州纳米技术与纳米仿生研究所国际实验室, 江苏 苏州 215123
吴东岷:中国科学院苏州纳米技术与纳米仿生研究所国际实验室, 江苏 苏州 215123

联系人作者:李敏(mli2011@sinano.ac.cn)

备注:梁凤超(1991-),男,硕士研究生,主要从事光波导与光电器件方面的研究。E-mail: fcliang2016@sinano.ac.cn

【1】Wang X, Zhao Y, Yang F, et al. Fluorescence microscopy system with high speed polarization based on electro optical modulator[J]. Acta Optica Sinica, 2017, 37(11): 1118001.
王潇, 赵远, 杨凤, 等. 基于电光调制器的高速偏振荧光显微系统[J]. 光学学报, 2017, 37(11): 1118001.

【2】Bao Z W, Zhou H J, Li J S. Finite element method analysis of a novel traveling-wave optical modulator based on LiNbO3 fibers[J]. Journal of Tianjin University, 2005, 38(8): 730-734.
鲍振武, 周洪娟, 李九生. LiNbO3光纤型行波光调制器的有限元分析[J]. 天津大学学报, 2005, 38(8): 730-734.

【3】Yi J C, Kim S H, Sang S C. Finite-element method for the impedance analysis of traveling- wave modulators[J]. Journal of Lightwave Technology, 1990, 8(6): 817-822.

【4】Gopalakrishnan G K, Burns W K, Mcelhanon R W, et al. Performance and modeling of broadband LiNbO3 traveling wave optical intensity modulators[J]. Journal of Lightwave Technology, 1994, 12(10): 1807-1819.

【5】Zhang X, Miyoshi T. Optimum design of coplanar waveguide for LiNbO3 optical modulator [J]. IEEE Transactions on Microwave Theory & Techniques, 1995, 43(3): 523-528.

【6】Mitomi O, Noguchi K, Miyazawa H. Design of ultra-broad-band LiNbO3 optical modulators with ridge structure[J]. IEEE Transactions on Microwave Theory & Techniques, 1995, 43(9): 2203-2207.

【7】Noguchi K, Mitomi O, Miyazawa H, et al. A broadband Ti:LiNbO3 optical modulator with a ridge structure[J]. Journal of Lightwave Technology, 1995, 13(6): 1164-1168.

【8】Abe N M, Franco M A R, Passaro A. Analysis of an x-cut Ti:LiNbO3 electro-optic modulator with a ridge structure[C]. IEEE International Microwave & Optoelectronics Conference, 1999, 1: 144-148.

【9】Rabiei P, Steier W H. Lithium niobate ridge waveguides and modulators fabricated using smart guide[J]. Applied Physics Letters, 2005, 86(16): 161115.

【10】Li J Y, Yao Y Q, Wu J J, et al. Theoretical analysis and preliminary fabrication of Ti-diffused LiNbO3 ridge waveguides[J]. Acta Optica Sinica, 2013, 33(2): 0223001.
李金洋, 要彦清, 吴建杰, 等. 钛扩散铌酸锂脊形波导理论分析与初步制备[J]. 光学学报, 2013, 33(2): 0223001.

【11】Ramaswamy V, Divino M D, Standley R D. Balanced bridge modulator switch using Ti-diffused LiNbO3 strip waveguides[J]. Applied Physics Letters, 1978, 32(10): 644-646.

【12】Hunter D B. Incoherent bipolar tap microwave photonic filter based on balanced bridge electro-optic modulator[J]. Electronics Letters, 2004, 40(14): 856-858.

【13】Jung H. Integrated-Optic electric-field sensor utilizing a Ti:LiNbO3 Y-fed balanced-bridge Mach-Zehnder interferometric modulator with a segmented dipole antenna[J]. Journal of the Optical Society of Korea, 2014, 18(6): 739-745.

【14】Franco M A R, Passaro A, Abe N M, et al. A design study of a Ti:LiNbO3 traveling-wave electro-optic modulator by the finite element method[C]. IEEE Microwave and Optoelectronics Conference, 1999, 1: 158-162.

【15】Kawano K, Noguchi K, Kitoh T, et al. A finite element method (FEM) analysis of a shielded velocity-matched Ti:LiNbO3 optical modulator[J]. IEEE Photonics Technology Letters, 1991, 3(10): 919-921.

【16】Li J Y, Lu D F, Qi Z M. Analyses of wavelength dependence of the electro-optic overlap integral factor for LiNbO3 channel waveguides[J]. Acta Physica Sinica, 2014, 63(7): 077801.
李金洋, 逯丹凤, 祁志美. 铌酸锂波导电光重叠积分因子的波长依赖特性分析[J]. 物理学报, 2014, 63(7): 077801.

【17】Wu Y K, Wang W S. Design and fabrication of sidewalls-extended electrode configuration for ridged lithium niobate electro-optical modulator[J]. Journal of Lightwave Technology, 2008, 26(2): 286-290.

【18】Burns W K, Klein P H, West E J, et al. Ti diffusion in Ti:LiNbO3 planar and channel optical waveguides[J]. Journal of Applied Physics, 1979, 50(10): 6175-6182.

【19】Fukuma M, Noda J. Optical properties of titanium-diffused LiNbO3 strip waveguides and their coupling-to-a-fiber characteristics[J]. Applied Optics, 1980, 19(4): 591-597.

引用该论文

Liang Fengchao,Li Min,Wu Dongmin. Optimized Design of Low Driving and High Modulation X-Cut LiNbO3 Electro-Optical Modulator[J]. Acta Optica Sinica, 2018, 38(7): 0713001

梁凤超,李敏,吴东岷. 低驱动、高调制X-Cut铌酸锂电光调制器的优化设计[J]. 光学学报, 2018, 38(7): 0713001

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