Ring resonators have always been referred to as a highly flexible structure for designing optical devices. In this paper, we have designed and evaluated two 8-channel optical demultiplexers using photonic crystal ring resonators. The purpose of this study is to investigate the flexibility of this type of resonator for designing and manufacturing optical devices based on photonic crystals. To the extent that we have investigated the literature, there is no report so far on such a study. For this purpose, two structures with the same structural parameters, but only with a difference in the type of lattice constant (square or triangular) are used. Both structures have a common photonic band gap within a proper range for telecommunication applications used in wavelength-division multiplexing (WDM) systems. Both designed structures have an average crosstalk of −26 dB. For the demultiplexer structure with a square lattice constant, the quality factor and the transmission coefficient are 3,046 and 93.7% respectively, and its channel spacing is 1.97 nm. For the structure with a triangular lattice constant, the quality factor and the transmission coefficient are 1577.7 and 94.5%, respectively and its channel spacing is equal to 4 nm. To obtain the photonic band gap of the structures, the plane wave expansion (PWE) method is used and the output spectrum of the structures is obtained using the finite-difference time-domain (FDTD) method. The good results obtained in this study is through designing and simulating optical demultiplexer structures only by creating a change in the type of lattice constant used. This undoubtedly justifies the high flexibility of ring resonators, when used in the design of optical devices, as well as their suitability for the use in WDM systems

环形谐振器一直被称为用于设计光学设备的高度灵活的结构。在本文中，我们设计并评估了两个使用光子晶体环形谐振器的8通道光解复用器。这项研究的目的是研究用于设计和制造基于光子晶体的光学器件的这种谐振器的灵活性。就我们已经研究文献的程度而言，迄今尚无有关此类研究的报道。为此目的，使用具有相同结构参数但仅具有不同的晶格常数（正方形或三角形）的两个结构。这两种结构在波分复用（WDM）系统中使用的电信应用的适当范围内，都有一个公共光子带隙。两种设计结构的平均串扰为-26 dB。对于具有正方形晶格常数的解复用器结构，品质因数和传输系数分别为3046和93.7％，其通道间隔为1.97 nm。对于具有三角形晶格常数的结构，品质因数和透射系数分别为1577.7和94.5％，并且其沟道间隔等于4 nm。为了获得结构的光子带隙，使用了平面波扩展（PWE）方法，并使用时域有限差分（FDTD）方法获得了结构的输出光谱。在这项研究中获得的良好结果是仅通过改变所使用的晶格常数的类型来设计和模拟光学多路分解器结构。