基于硅－铌酸锂复合波导的偏振复用器设计

南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (3): 415–.

基于硅－铌酸锂复合波导的偏振复用器设计

公姿苏1，季　伟1，尹　锐1*，胡　卉2，蔡璐彤2，张世成1，李江月1，王军宝1

出版日期:2017-05-30 发布日期:2017-05-30
作者简介:1.山东大学信息科学与工程学院，济南，250100；2.山东大学物理学院，济南，250100
基金资助:
基金项目：国家自然科学基金(61201210，61571273)，山东省科技开发项目(2014GGH201006)，IPOC开放基金(BUPT)，山东大学基础研究基金收稿日期：2016－10－08 *通讯联系人，Email：yinrui@sdu.edu.cn

The polarization multiplexer based on Siliconlithium niobate hybrid integrated waveguide

Gong Zisu1，Ji Wei1，Yin Rui1*，Hu Hui2，Cai Lutong2，Zhang Shicheng1，Li Jiangyue1，Wang Junbao1

Online:2017-05-30 Published:2017-05-30
About author:1.School of Information Science and Engineering，Shandong University，Ji’nan，250100，China；2．School of Physics，Shandong University，Ji’nan，250100，China

摘要/Abstract

摘要： 结合铌酸锂薄膜的研究现状，提出一种硅与铌酸锂复合集成的波导结构，该波导结构能够将硅基的成熟工艺与铌酸锂材料的特性结合，利用铌酸锂的高双折射特性，该波导结构在实现偏振控制器件方面具有一系列独特的优势．基于硅与铌酸锂复合的波导结构，设计了两类无源器件：定向耦合型偏振分离器和定向耦合型偏振分离转换器．分别采用光束传输法(BPM)和时域有限差分法(FDTD)对两类器件进行了仿真与性能分析，仿真计算结果表明，偏振分离器能够实现TE模和TM模的分离，且消光比高于30 dB，在保证消光比大于10 dB的情况下，其带宽约为70 nm，工艺容差达100 nm；偏振分离转换器能够实现TM模向TE模的转换，且消光比达20 dB.两类器件均具有尺寸小、结构简单、工艺上易于实现等优点．

Abstract: With the research status of lithium niobate thin film，we propose a SiliconLithium niobate hybrid integrated waveguide which could combine the mature processing technology of Silicon with the properties of lithium niobate.Utilizing the high birefringence of lithium niobate，the SiliconLithium niobate hybrid integrated waveguide has a series of unique advantages in the design of polarization control devices.Based on the SiliconLithium niobate hybrid integrated waveguide，we proposed two types of passive devices.The first one is polarization besm splitter(PBS)based on directional coupler(DC)which could achieve the separation of the TE and TM mode with a relatively simple structure.Then the beam propagation method(BPM)is used to simulate and analyze the performance of the device.The numerical simulations show that the device has a good performance for the separation of TE and TM polarizations with a high extinction ratio(higher than 30 dB)．The simulated fabrication tolerance for the variation of the waveguide width is about 100 nm and the bandwidth is about 70 nm when the extinction ratio is higher than 10 dB.This decive can avoid complex structure and make the design simpler because of the high birefringence of lithium niobate.The other one is polarization splitterrotator(PSR)based on directional coupler(DC)which could achieve the separation of TE and TM polarizations and the rotation of the TM polarization.The finite difference time domain(FDTD)method is used to simulate the performance of the device.The simulations show that the device has a good performance for the separation of TE and TM polarizations and the rotation of the TM polarization with a high extinction ratio(higher than 20 dB)．Since the SiliconLithium niobate hybrid integrated waveguide is asymmetrical in the vertical direction，this device can also avoid the complex structure and be achieved with a relatively simple.Both of the two devices have the advantages such as small size，simple structure and easy to be achieved.

公姿苏1，季　伟1，尹　锐1*，胡　卉2，蔡璐彤2，张世成1，李江月1，王军宝1. 基于硅－铌酸锂复合波导的偏振复用器设计[J]. 南京大学学报(自然科学版), 2017, 53(3): 415–.

Gong Zisu1，Ji Wei1，Yin Rui1*，Hu Hui2，Cai Lutong2，Zhang Shicheng1，Li Jiangyue1，Wang Junbao1. The polarization multiplexer based on Siliconlithium niobate hybrid integrated waveguide[J]. Journal of Nanjing University(Natural Sciences), 2017, 53(3): 415–.

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