In this paper, Two Dimensional Photonic Crystals based Add Drop filter (ADF) is designed for DWDM applications. The existing work concentrates in Coarse Wavelength Division Multiplexing and few filters reported for DWDM with non-uniform channel spacing, and low quality factor. The proposed ADF enhances the quality factor using Rounded Square Ring Resonator (RSRR) for ensuring efficient bandwidth in supporting WDM systems. The design consists of bus waveguide, drop waveguide and RSRR with inner quasi-square ring in the square lattice. The dielectric constant of the Si rod is 11.68 which are hosted in the air. The line defect is created by removing 4 rods (Quasi ring) in the center of the inner square ring. The line defect in the ring resonator is used to reduce the radiation field components surrounded by the resonator. The performance parameters of ADF are investigated using 2D Finite Difference Time Domain algorithm. The proposed ADF drops a channel at 1636.2 nm, with the bandwidth of 0.7 nm, high quality factor of 2337, and the dropping efficiency of about 100%. The size of the device is 412.76 µm². It is highly sufficient to support WDM systems for future Photonic Integrated Circuits (PIC). Further, the impact of functional parameters such as transmission efficiency, quality factor, bandwidth are investigated by varying the structural parameters, namely, adjacent rod radius, scatterer rod radius, coupling rod radius, lattice constant, inner rod radius and rod radius.

在本文中，基于二维光子晶体的加减滤光片（ADF）是为DWDM应用设计的。现有工作主要集中在粗波分复用上，很少报道DWDM滤波器具有不均匀的信道间隔和低品质因数。拟议的ADF使用圆角方形谐振器（RSRR）增强了品质因数，以确保在支持WDM系统中的有效带宽。该设计由总线波导，引出波导和RSRR组成，在正方形晶格中具有内部准正方形环。Si棒的介电常数是11.68，其存在于空气中。通过移除内部方形环中心的4个杆（准环）来创建线缺陷。环形谐振器中的线路缺陷用于减少谐振器包围的辐射场分量。使用2D时域有限差分算法研究了ADF的性能参数。拟议中的ADF在1636.2 nm处丢弃一条信道，带宽为0.7 nm，高品质因数为2337，并且丢弃效率约为100％。设备尺寸为412.76 µm²。它足以支持未来的光子集成电路（PIC）的WDM系统。此外，通过改变结构参数，即相邻杆半径，散射杆半径，耦合杆半径，晶格常数，内杆半径和杆半径，研究了诸如传输效率，品质因数，带宽之类的功能参数的影响。