Abstract
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.
Highlights
The Optical fiber communication sends the information with the pulses of light with less Bit Error Rate (BER) and high Signal to Noise Ratio (SNR) compared with the Radio Frequency (RF)
The incident light in Photonic Band Gap (PBG) cannot propagate in the crystal, ; the light can be allowed to propagate with breaking the periodicity in the Photonic crystal (PC), introducing the defect in the PC allowing the electromagnetic waves to confine strongly based on the defects
The power monitor place in the receiver port to measure the power based on Finite Difference Time Domain (FDTD) algorithm .The output power measure using the following equation
Summary
The Optical fiber communication sends the information with the pulses of light with less Bit Error Rate (BER) and high Signal to Noise Ratio (SNR) compared with the Radio Frequency (RF). Existing optical drop filter designs are as given by Fabry-Perot cavity (Tran et al.1996), gratings (Kersey et al.1993), interferometers (Wooten et al.1996) and the microwave ring resonator by Sun (2011). The proposed filter design to work with constructive interference to obtain the high dropping efficiency (>99%), narrow spectral linewidth (0.7 nm), and high Q factor (2223) at resonance wavelength of 1636.2 nm is reported. The proposed filters are investigated and reported with structural parameters to tune the different strong resonant wavelengths to improve the utilization of the device in many applications. The proposed Add Drop Filter (ADF) design with a square lattice array of periodic dielectric rods with high refractive index of 3.19, regular radius of rod of 130 nm, Period (lattice constant) of 650 nm which results in useful Photonic crystal band gap for realizing optical device. The single rod placed at each corner of square act as scatterer rods (R3) which is highlighted in green color it minimizes the scatter loss, and back and forth reflection waves improve the resonator performance
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