53, 030603(2016)
激光与光电子学进展
Laser & Optoelectronics Progress
©2016《中国激光》杂志社
030603-1
四通道光子晶体解波分复用器的研究
董小伟
1
倪品品
1*
刘文楷
2
1
北方工业大学电子信息工程学院, 北京 100144
2
北方工业大学计算机学院, 北京 100144
摘要 研究了二维三角 晶格光子晶体环形腔和微 腔 的谐振规律和耦合特性,采用 1 个环形腔搭配 2 个 微腔的结构形
式,设计了一种新型高效的四通道解波分复用器,不仅实现了对波长分别为 1471、1511、1551、1591 nm 光波的解波分
复用,而且使器件尺寸明显减小。利用时域有限差分法详细分析了环形腔中心柱数量和半径对其透射谱的影响,结
果表明:环形腔具有多模的特性,改变环形腔的中心柱半径可以调控其谐振波长,结合微腔的选频效应,最终使四通
道解波分复用器各通道的透射率达到 90%以上,通道隔离度大于 20 dB。同时调节方法简单、耦合 效 率 较高,在全光
通信集成领域具有潜在的应用价值。
关键词 光通信; 光子晶体; 解波分复用器; 环形腔; 时域有限差分法
中图分类号 TN256 文献标识码 A
doi: 10.3788/LOP53.030603
Investigation of Four-Channel Photonic Crystal Wavelength Division
Demultiplexer
Dong Xiaowei
1
Ni Pinpin
1
Liu Wenkai
2
1
College of Electronic and Information Engineering, North China University of Technology, Beijing 100144, China
2
College of Computer Science, North China University of Technology, Beijing 100144, China
Abstract The resonance rule and coupled characteristics of two dimensional triangle lattice photonic crystal ring
resonator and micro-cavity are studied. A novel efficient four-channel wavelength division demultiplexer is proposed,
which is based on the structure composed by a ring resonator and two micro- cavities. The device realizes the
wavelength division demultiplexing with wavelengths of 1471, 1511, 1551, 1591 nm, and the size of the device is
reduced significantly. The impact of the ring resonator center rods number and radius on the transmission spectrum
is investigated using the finite difference time domain method. The results show that the ring resonator has multi-
mode characteristic and it can adjust the resonance wavelength of the ring resonator by changing its center column
radius. By using the micro-cavity frequency selective effect, the transmission rate of each channel reaches more than
90% and the channel isolations are over 20 dB. At the same time, it is simple and efficient, which has potential
application value in the field of all optical communication integration.
Key words optical communications; photonic crystals; wavelength division demultiplexer; ring resonator; finite
difference time domain method
OCIS codes 230.5298; 230.7408; 130.7408; 160.5293
1 引 言
光子晶 体是 20 世纪末 兴起的 一种新 型人工材 料,它的介 电常数 和折射 率等在空 间中具 有一定 的周期
性,由此产生布拉格散射,使光子晶体具有光子带隙的特性
[1- 2]
。由光子晶体制成的各种光通信器件,包括全
光开关
[3]
、光调制器
[4]
、光分束器
[5]
、波分复用/解波分复用器
[6-7]
等,具有尺寸小、损耗低、便于集成等优点。
目前,基于光子晶体的解波分复用器主要采用波导或谐振腔来实现耦合选频。前者是将耦合波导与入
收稿日期: 2015-10-20; 收到修改稿日期: 2015-10-27; 网络出版日期: 2016-00-00
基金项目: 国家自然科 学 基金(61007007)、北京市属高等 学校高层次人才 引 进与培养计划(CIT&TCD201304001)、北方工
业大学科研人才提升计划项目(CCXZ201307)
作者简介: 董小伟(1978—),女,博士,副教授,主要从事光纤通信及光电子方面的研究。E-mail: way7803@163.com
*通信联系人。E-mail: nipinpinemail@163.com