In this article, an optical isolator is designed and simulated based on a hybrid configuration of the photonic crystal (PhC) and graphene. The PhC membrane is a hexagonal lattice of air holes arranged in a nonlinear silicon substrate. To provide a nonreciprocal transmission (optical isolator), breaking the symmetry of the light propagation path (the forth and back routes) is an essential condition. Here, the asymmetrical round trip of the light propagation and the Kerr-nonlinear effect are employed to obtain asymmetric propagation. The isolator structure includes a PhC waveguide that asymmetrically side-coupled to a specific embedded cavity. Then, to attain a tunable asymmetric transmission, a Nano-layer of graphene is located on the top of the mentioned PhC configuration. By altering the chemical potential of graphene one can control the isolation rate, frequency, and bandwidth of offered structure and thus possess a tunable optical isolator. The simulation results show that a 0.5 nm frequency shift can attain by the graphene chemical potential alterations from 0.45 eV to 0.65 eV in which it is suitable for Dense Wavelength Division Multiplexing (DWDM) communication and integrated optical circuits. Furthermore, as another advantage, a high forward normalized transmission (0.6) has resulted in a large average isolation rate of 32.5 dB due to low losses of the proposed structure.

在本文中，基于光子晶体 (PhC) 和石墨烯的混合配置设计和模拟了光隔离器。PhC 膜是排列在非线性硅衬底中的六边形气孔晶格。为了提供非互易传输（光隔离器），打破光传播路径（来回路径）的对称性是必不可少的条件。在这里，采用光传播的非对称往返和克尔非线性效应来获得非对称传播。隔离器结构包括非对称侧耦合到特定嵌入式腔的 PhC 波导。然后，为了获得可调的非对称传输，石墨烯纳米层位于上述 PhC 配置的顶部。通过改变石墨烯的化学势，人们可以控制所提供结构的隔离率、频率和带宽，从而拥有可调谐的光隔离器。仿真结果表明，通过石墨烯化学势从 0.45 eV 变化到 0.65 eV，可以获得 0.5 nm 的频移，适用于密集波分复用 (DWDM) 通信和集成光电路。此外，作为另一个优点，由于所提议结构的低损耗，高正向归一化传输 (0.6) 已导致 32.5 dB 的大平均隔离率。65 eV，适用于密集波分复用 (DWDM) 通信和集成光路。此外，作为另一个优点，由于所提议结构的低损耗，高正向归一化传输 (0.6) 已导致 32.5 dB 的大平均隔离率。65 eV，适用于密集波分复用 (DWDM) 通信和集成光路。此外，作为另一个优点，由于所提议结构的低损耗，高正向归一化传输 (0.6) 已导致 32.5 dB 的大平均隔离率。