三波长光子晶体耦合波分复用器的设计与仿真

目前,光子晶体的波导共振耦合技术被广泛应用,设定波长下的波导透射频率的高低成为影响器件功能优劣的重要因素。首先对比了改变光子晶体介质柱折射率和半径的大小与耦合点归一化频率的关系,之后利用时域有限差分法设计了一种由三种波导构成的共振耦合型光子晶体结构的波分复用器,并且在波长分别为1 490 nm与1 440 nm的光信号下的波导共振区域增加了一定数量的介质柱形成一种新的微腔耦合区域。并且通过在1 310 nm波长的输出信道末端改变介质柱的半径大小,使得1 310 nm波长的光信号的透射率提高到了95.5%。研究表明,通过增大介质柱半径的大小Rc,可以使得对应的光信号透射率的大幅改善。

Design and Simulation of three wavelength Photonic Crystals Coupling WDM

The photonic crystals waveguide resonance coupling technology is widely used at present, and the discretion of set under the wavelength of the waveguide transmission frequency becomes a important factor influencing the device function advantages and disadvantages.Firstly, this paper compares the size changed about radius of photonic crystal refractive index medium columns and relationship with the coupling point normalized frequency.Using the finite difference time domain method designs a composed of three kinds of waveguide coupling resonance photonic crystals structure of the WDM. And the wavelength of 1490 nm and 1440 nm respectively under the optical signals of waveguide resonant column area increased by a certain number of medium form a new kind of microcavity coupling region. In the end of the 1310 nm wavelength output channel changes the radius size medium column, 1310 nm wavelength optical signal transmission rate increased to 95.5%. Research shows that by increasing the size of the column radius of Rc medium, can make the corresponding light signal transmission rate significantly improved.