一种实现超微光子晶体型定向耦合器的方法

J4 ›› 2009, Vol. 26 ›› Issue (4): 494-498.

一种实现超微光子晶体型定向耦合器的方法

吴江海

上海政法学院上海 201701

收稿日期:2008-12-10 修回日期:2009-03-18 出版日期:2009-07-28 发布日期:2009-06-29
通讯作者: 吴江海,,男,副教授,研究方向为物理学、计算机科研与教学 E-mail:wjh@shupl.edu.cn

A way achieving ultracompact directional coupler based on photonic crystal waveguides

WU Jiang-Hai

Shanghai University of Political Pcience and Low , Shanghai, 201701, China

Received:2008-12-10 Revised:2009-03-18 Published:2009-07-28 Online:2009-06-29

摘要/Abstract

摘要：

在光子晶体定向耦合器中，通过减小两耦合波导之间介电柱的折射率来增大耦合系数，从而获得更短的拍长，形成超微的器件尺寸。耦合器的奇模场随调制折射率的减小变化不敏感，偶模场向更高频率的方向移动。在同一频率范围内，调制折射率减小，导致拍长随频率变化的函数曲线的斜率随频率增加而增大，这一特性可以在波分复用器中用来减小相邻信号频率差，在相同的器件长度下，可获得更多的信道。采用时域有限差分法验证了拍长随调制折射率减小而减小的变化规律。

关键词: 光通信, 光子晶体波导, 定向耦合, 时域有限差分法, 波分复用/解复用

Abstract:

In a directional coupler based on photonic crystal waveguides (PCWs), the coupling coefficient can be increased by reducing the refractive indexes of the rods between the two coupled PCWs. Accordingly, a shorter beating length and ultracompact device can be achieved. The distribution of odd modal intensity is nearly unaffected, but the distribution of the even modal intensity shifts to higher frequencies when the indexes are reduced. Furthermore, the beating length slope increases for a fixed frequency range, and this technique allows smaller channel spacing and more signal channels for a given total devices length. The finite-difference time-domain method is used to validate the behavior that the beating length can be shortened by reducing the refractive index of the modified rods.

Key words: optical communication, photonic crystal waveguide, directional coupler, the finite-difference time-domain method, wavelength multiplexers /demultiplexers

中图分类号:

O439

吴江海. 一种实现超微光子晶体型定向耦合器的方法[J]. J4, 2009, 26(4): 494-498.

WU Jiang-Hai. A way achieving ultracompact directional coupler based on photonic crystal waveguides[J]. J4, 2009, 26(4): 494-498.

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