光子学报 ›› 2019, Vol. 48 ›› Issue (12): 1248003-1248003.doi: 10.3788/gzxb20194812.1248003

• “瞬态光子学”专题 • 上一篇    下一篇

基于硅基波导光子轨道角动量的产生及复用

曹恒颖1, 陈鹤鸣2, 白秀丽1   

  1. 1. 南京邮电大学 电子与光学工程学院, 微电子学院, 南京 210023;
    2. 南京邮电大学 贝尔英才学院, 南京 210023
  • 收稿日期:2019-05-28 发布日期:2019-12-30
  • 通讯作者: 陈鹤鸣(1958-),男,教授,学士,主要研究方向为光通信技术、信息光电子技术和光波技术.Email:chhm@njupt.edu.cn
  • 作者简介:曹恒颖(1995-),女,硕士研究生,主要研究方向为光子轨道角动量的产生及复用.Email:1017030921@njupt.edu.cn
  • 基金资助:
    国家自然科学基金(Nos.61077084,61571237),江苏省自然科学基金(No.BK20151509),江苏省研究生科研创新计划(No.KYLX15_0835)

Orbital Angular Momentum Modes Generator and Multiplexer Based on Silicon Waveguides

CAO Heng-ying1, CHEN He-ming2, BAI Xiu-li1   

  1. 1. College of Electronic and Optical Engineering&College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;
    2. Bell Honors School, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • Received:2019-05-28 Published:2019-12-30
  • Supported by:
    The National Natural Science Foundation of China (Nos. 61077084, 61571237), Natural Science Foundation of Jiangsu Province (No. BK20151509), Postgraduate Research & Practice Innovation Program of Jiangsu Province (No.KYLX15_0835)

摘要: 设计了一种基于硅基波导光子轨道角动量的产生及复用器,该器件主要由非对称定向耦合器和带沟槽的波导两部分组成.根据相位匹配条件,基模TE00通过非对称定向耦合器耦合成一阶模TE10,带沟槽的波导可支持光轴相对于水平和垂直方向旋转45°的两个正交的本征模,调整两个正交的本征模的相位差,使其进行简并,可进一步将TE10转换为多种轨道角动量模式,并在第二个沟槽结构中进行复用.采用时域有限差分法进行仿真计算,结果表明:该器件可以实现拓扑荷为+1、0、-1的光子轨道角动量模式的产生及复用,且器件结构紧凑,尺寸小于80 μm×5.3 μm,损耗小于0.24 dB,适用波长范围为1.47~1.58 μm.该器件制作工艺简单,易于集成,可应用于轨道角动量复用系统等领域.

关键词: 光通信, 轨道角动量, 轨道角动量多路复用, 时域有限差分法, 硅基波导, 相位匹配, 模式耦合

Abstract: Based on an integrated silicon platform, a device for generating and multiplexing optical orbital angular momentum modes is proposed, which is consisted of asymmetric directional coupler and trench waveguides. According to the principle of phase matching, the fundamental mode TE00 is coupled to the first-order mode via an asymmetric directional coupler. Single-trench waveguide can support two orthogonal linear polarization-like modes whose optical axes are rotated by around 45° with respect to the horizontal and vertical directions. Adjusting the phase difference of two orthogonal eigenmodes to make them degenerate, TE00 can be converted into orbital angular momentum modes with various topological charges, and multiplexed in the second trench. The simulation is carried out with finite difference domain method. The results show that the device can realize the generation and multiplex of orbital angular momentum modes with topological charges of +1, 0, -1. The proposed device is very compact with a footprint of <80 μm×5.3 μm and an insertion loss of 0.24 dB, and is fit for a wavelength range from 1.47 μm to 1.58 μm. The structure is simple and easy to integrate, having a good application in orbital angular momentum multiplexing system.

Key words: Optical communication, Orbital angular momentum modes, Orbital angular momentum modes multiplex, Finite difference time domain method, Silicon waveguides, Phase matching, Mode coupling

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