光子晶体八通道波分复用器研究
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摘要
基于光子晶体谐振腔优越的选频特性,设计了一种八波长光子晶体波分复用器。利用平面波展开法得到了特定晶格排列和半径下光子晶体的能带结构,采用时域有限差分法分析了微腔耦合频率的变化规律,得出环形谐振器和微腔之间的共振耦合特性。该器件主要由4个光子晶体环形腔和8个尺寸不同的微腔组成,实现了1.37,1.39,1.42,1.44,1.50,1.51,1.53,1.55μm等8个波长的波分解复用。结果表明,只通过调节微腔中心柱和外围介质柱的半径,就可以使8个波长从特定端口输出,且输出效率都可以达到97%以上。所设计的器件尺寸为23μm×18μm,具有物理尺寸小、耦合效率高等优点,在集成光学领域具有潜在的应用前景。
Herein,an eight-wavelength photonic-crystal wavelength demultiplexer was designed based on the superior frequency-selection characteristics of a photonic crystal resonator.The energy band structure of the photonic-crystal with a specific lattice constant and radius was obtained using the plane wave expansion method.The law of variation in the coupling frequency of a micro-cavity was analyzed via the finite difference time domain method.The resonant coupling between the ring resonator and the micro-cavity was demonstrated.The device primarily comprised four photonic-crystal ring resonators and eight micro-cavities with different sizes.It achieved wavelength-division multiplexing at eight wavelengths of 1.37,1.39,1.42,1.44,1.50,1.51,1.53,and1.55μm.The results show that the aforementioned eight wavelengths can be output from a specific port,and an output efficiency of more than 97%can be achieved by adjusting the radii of the central rods of the micro-cavity and the peripheral dielectric rods.The designed device can be applied in integrated optics owing to its small physical size of 23μm×18μm and high coupling efficiency.
Herein,an eight-wavelength photonic-crystal wavelength demultiplexer was designed based on the superior frequency-selection characteristics of a photonic crystal resonator.The energy band structure of the photonic-crystal with a specific lattice constant and radius was obtained using the plane wave expansion method.The law of variation in the coupling frequency of a micro-cavity was analyzed via the finite difference time domain method.The resonant coupling between the ring resonator and the micro-cavity was demonstrated.The device primarily comprised four photonic-crystal ring resonators and eight micro-cavities with different sizes.It achieved wavelength-division multiplexing at eight wavelengths of 1.37,1.39,1.42,1.44,1.50,1.51,1.53,and1.55μm.The results show that the aforementioned eight wavelengths can be output from a specific port,and an output efficiency of more than 97%can be achieved by adjusting the radii of the central rods of the micro-cavity and the peripheral dielectric rods.The designed device can be applied in integrated optics owing to its small physical size of 23μm×18μm and high coupling efficiency.
引文
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[14] Guo H,Wu P,Yu T B,et al.Design of large separating angle ultracompact multiway beam splitter based on photonic crystal ring resonators[J].Acta Optica Sinica,2010,30(5):1501-1505.郭浩,吴评,于天宝,等.光子晶体环形谐振腔大角度超微多路光分束器的设计[J].光学学报,2010,30(5):1501-1505.
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[2] Liu J P,Li H B,Meng X D,et al.Eigen field distribution of two-dimensional functional photonic crystals with point defects[J].Chinese Journal of Lasers,2018,45(8):0803001.刘继平,李海波,孟祥东,等.含点缺陷二维函数光子晶体的本征场分布[J].中国激光,2018,45(8):0803001.
[3] Liang L X,Zhang X J,Wu X S,et al.Terahertz filter and optical switch based on magnetic-photonic crystals[J].Acta Optica Sinica,2018,38(5):0513002.梁龙学,张晓金,吴小所,等.基于磁光子晶体的太赫兹滤波器和光开关[J].光学学报,2018,38(5):0513002
[4] Li L,Liu G Q,Chen Y H.An optical switch based oncoupledheterostructurephotonic-crystal waveguides[J].Acta Optica Sinica,2013,33(1):0123002.黎磊,刘桂强,陈元浩.光子晶体异质结耦合波导光开关[J].光学学报,2013,33(1):0123002.
[5] Zhang X X,Chen H M.Design and performance analysis of photonic crystal polarizing beam splitter[J].Laser&Optoelectronics Progress,2017,54(1):011301.张信祥,陈鹤鸣.光子晶体偏振分束器的设计与性能分析[J].激光与光电子学进展,2017,54(1):011301.
[6] Wang J L,Liu Y,Chen H M.Design on terahertz polarization beam splitter based on self-collimating effect of photonic crystal[J].Acta Optica Sinica,2018,38(4):0423001.汪静丽,刘洋,陈鹤鸣.基于光子晶体自准直效应的太赫兹偏振分束器设计[J].光学学报,2018,38(4):0423001.
[7] Fu P D,Chen H M.Design and performance analysis of three mode division multi/demultiplexer based on two-dimensional photonic crystals[J]. Laser&Optoelectronics Progress,2017,54(2):020602.付培栋,陈鹤鸣.基于二维光子晶体三模式模分复用/解复用器的设计与性能分析[J].激光与光电子学进展,2017,54(2):020602.
[8] Dong X W,Ni P P,Liu W K.Investigation of fourchannelphotoniccrystalwavelengthdivision demultiplexer[J].Laser&Optoelectronics Progress,2016,53(3):030603.董小伟,倪品品,刘文楷.四通道光子晶体解波分复用器的研究[J].激光与光电子学进展,2016,53(3):030603.
[9] Liao K,Liao J F,Xie Y M,et al.A defect photonic crystal fiber with high birefringence and negative dispersion[J].Laser&Optoelectronics Progress,2018,55(7):070604.廖昆,廖健飞,谢应茂,等.一种高双折射负色散的缺陷型光子晶体光纤[J].激光与光电子学进展,2018,55(7):070604.
[10] Yang Y H,Yang F L,Lu L,et al.Research on interferometer photonic crystal fiber optic gyroscope technology[J].Acta Optica Sinica,2018,38(3):0328004.杨远洪,杨福铃,陆林,等.干涉型光子晶体光纤陀螺技术研究[J].光学学报,2018,38(3):0328004.
[11] Zhang J,Xu X M,He L J,et al.Four-wavelength multiplexer/demultiplexer based on photonic crystal resonant coupling[J].Acta Physica Sinica,2012,61(5):054213.张佳,徐旭明,何灵娟,等.基于光子晶体共振耦合的四波长波分复用/解复用器[J].物理学报,2012,61(5):054213.
[12] Zhuang Y Y,Chen H M.Study on three-wavelength photonic crystal WDM[J]. Study on Optical Communications,2013(6):49-51.庄煜阳,陈鹤鸣.三波长光子晶体波分复用器的研究[J].光通信研究,2013(6):49-51.
[13] Zhou X P,Shu J,Lu B J,et al.Two-wavelength division demultiplexer based on triangular lattice photonic crystal resonant cavity[J].Acta Optica Sinica,2013,33(1):0123001.周兴平,疏静,卢斌杰,等.基于三角晶格光子晶体谐振腔的双通道解波分复用器[J].光学学报,2013,33(1):0123001.
[14] Guo H,Wu P,Yu T B,et al.Design of large separating angle ultracompact multiway beam splitter based on photonic crystal ring resonators[J].Acta Optica Sinica,2010,30(5):1501-1505.郭浩,吴评,于天宝,等.光子晶体环形谐振腔大角度超微多路光分束器的设计[J].光学学报,2010,30(5):1501-1505.
[15] Liu W K,Li B Q,Dong X W,et al.Design and simulation on eight-channel photonic crystal filter[J].Semiconductor Optoelectronics,2012,33(6):772-774,821.刘文楷,李保群,董小伟,等.八通道光子晶体滤波器的设计与仿真[J].半导体光电,2012,33(6):772-774,821.
[16] Mehdizadeh F,Soroosh M,Alipour-Banaei H,et al.Alloptical8-channelwavelengthdivision demultiplexerbasedonphotoniccrystalring resonators[C]∥International Conference on Electrical and Electronics Engineering,November 30-December2,2017,Bursa,Turkey.New York:IEEE,2017:446-450.