An eight-channel wavelength demultiplexer by cascading of ring resonators (RRs) in photonic crystal (PhC) structure is proposed in this paper. In designing of this demultiplexer, we used eight square-shaped PhC RRs with different refractive index (RI) of defect rods to generate a distinctive resonance wavelength. Each PhC RR has a specific resonance wavelength with tuning a variety of design parameters such as RI of a whole, defect and inner rods and radius of defect rods. In operating wavelength of λ₀ = 1497 nm, the transmission power and quality factor (Q) of single RR are discovered as 96% and 1000, respectively. The average power transmission, channel spacing, crosstalk and full width at half maximum are found by finite difference time domain method to be about 96 ± 1%, 2.25 nm, − 35 dB and 1.5 nm, respectively. Simulation outcomes demonstrate that the designed demultiplexer has a proper operation. The footprint of the designed device is about ~ 115 μm², which makes this device a promising for future photonic integrated circuits.

中文翻译：

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使用改进的光子晶体环形谐振器的紧凑型八通道波长解复用器，用于CWDM应用

提出了一种通过光子晶体（PhC）结构中的环形谐振器（RR）级联的八通道波长解复用器。在设计该多路分解器时，我们使用了八个具有不同缺陷棒折射率（RI）的方形PhC RR，以产生独特的谐振波长。每个PhC RR都有特定的谐振波长，可以调节各种设计参数，例如整体的RI，缺陷和内部棒的半径以及缺陷棒的半径。在操作的波长λ ₀  = 1497纳米，所述传输功率和品质因数（Q单个RR的）分别被发现为96％和1000。通过有限差分时域方法发现平均功率传输，信道间隔，串扰和半峰全宽分别约为96±1％，2.25 nm，-35 dB和1.5 nm。仿真结果表明，所设计的解复用器具有适当的操作。所设计的设备的覆盖区为约115〜微米²，这使得该装置以供将来光子集成电路有希望的。