Photonic Crystal Drop Filter Exploiting Resonant Cavity Configuration (original) (raw)
Related papers
Channel Drop Filter Based on Coupled Cavity in Photonic Crystals
Journal of New Technology and Materials, 2014
In this paper, a five channel drop filter has been designed in a two dimensional photonic crystal with high dielectric rods in air. Each channel consists of a photonic crystal coupled cavity waveguide with double cavities combined with a line defect waveguide. Desired wavelengths are selected by setting different radii of the two point defects in the photonic crystal coupled cavity waveguides. Defect rods placed at the same channel have an identical radius. The performance of the designed filter has been numerically calculated using the finite difference time domain method. In the designed structure, higher efficiencies in all channels have been achieved.
2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT), 2019
In this paper we proposed a novel drop filter structure based on Photonic Band Gap (PBG) for the 1550nm communication wavelength. The filter is designed and then simulated using Finite Element Method (FEM) and Plane Wave Expansion Method (PWEM) method. The filter shows 91% efficiency at the mentioned wavelength. We also analyzed how the target wavelength can be varied by changing various aspects of the structure. The design utilizes all homogeneous method which is easier to fabricate and introduce in photonic integrated circuit.
Design and Simulation of a Photonic Crystal-Based 2-D Octagonal-Shaped Optical Drop Filter
Springer eBooks, 2021
In this paper, the bandwidth of a photonic crystal (PhC) based band pass filter is tailored to accommodate a carrier wavelength in presence of maximum shifts specified for a coarse wavelength division multiplexing (CWDM) system. For desired tailoring we introduce defects, whose distribution is crucial in determining flatness of the filter pass band. To analyze filter performance, transfer matrix method is employed, and a condition guiding distribution of defects within the structure is derived. Design parameters of proposed model are optimized through simulation using MATLAB. To validate the MATLAB simulation results for practical implementation, the filter is further simulated by CST MW Studio. Both simulation results show close agreement with each other. According to ITU-T Recommendation G.694.2 for a CWDM system, a channel wavelength may undergo a maximum shift of ±(6-7) nm. The flat top pass band of our proposed filter can support such channels. The most striking feature of the filter is that it is expected to perform satisfactorily, even if during fabrication, the dimension of individual unit cell deviates from its estimated value. The choice of silicon and silicon dioxide as PhC materials provides easy realization of integrated filter structure.
Optical and Quantum Electronics, 2021
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...
2016
In this paper a new optical channel drop filter (CDF) based on two dimensional (2-D) photonic crystals (PhC) with hexagonal shaped structure is proposed and numerically demonstrated by using the finite-difference-time-domain (FDTD) and planewave-expansion (PWE) techniques. Photonic crystals (PhCs) are artificial dielectric nanostructure materials in which a periodic modulation of the material dielectric constant results in a photonic band gap (PBG). By employing defects in the photonic crystals, light can steer in specific direction and consequently in the most of PhC applications, defects are used in their structures. The proposed structure is consisted of two series hexagonal shaped rings of Si rods between two straight waveguides to improve the performance of the channel drop filter. By analyzing the proposed structure, wide ranges of TE photonic band gap (PBG) would be achieved. It will be indicated that the proposed channel drop filter has appropriate characteristics and can be...
Channel drop filter in two-dimensional triangular lattice photonic crystals
Journal of the Optical Society of America A, 2007
Based on two-dimensional photonic crystals with a triangular lattice, a channel drop filter with a wavelengthselective reflection microcavity is designed. In the structure, two microcavities are used. One is used for a resonant tunneling-based channel drop operation. The other is used to realize wavelength-selective reflection feedback in the bus waveguide. The phase term, which is derived by means of coupled-mode theory to achieve close to 100% drop efficiency, is satisfied by modifying the sizes of the border air holes next to the bus waveguide section between the two cavities. Using the finite-difference time-domain method, the simulation results show complete power transfer between the bus and drop waveguides via the system.
Photonic crystal channel drop filters with mirror cavities
Optical and Quantum Electronics, 2007
In this paper, a new channel drop filter in two dimensional photonic crystals with mirror cavities is proposed. In the structure, three cavities are used. One is used for a resonant tunneling-based channel drop filter. The others are used to realize reflection feedback in the bus waveguide, which consists of a point defect micro-cavity side-coupled to a waveguide. The simulation results by using the finite-difference time-domain method conclude 98% output efficiency.
Photonic crystal channel drop filter with a wavelength-selective reflection micro-cavity
Optics Express, 2006
In the paper, a novel three-port channel drop filter in two dimensional photonic crystals (2D PCs) with a wavelength-selective reflection micro-cavity is proposed. In the structure, two micro-cavities are used. One is used for a resonant tunneling-based channel drop filter. The other is used to realize wavelength-selective reflection feedback in the bus wave-guide, which consists of a point defect micro-cavity side-coupled to a line defect waveguide based on photonic crystals. Using coupled mode theory in time, the conditions to achieve 100% drop efficiency are derived thoroughly. The simulation results by using the finite-difference timedomain (FDTD) method imply that the design is feasible.
Two dimensional Photonic Crystal Ring Resonator based Add Drop Filter for CWDM systems
Optik - International Journal for Light and Electron Optics, 2013
A two Dimensional Photonic Crystal based Bandpass Filter (2D-PCBPF) is proposed for C-Band of CWDM applications. It is designed with two quasi waveguides and a circular Photonic Crystal Ring Resonator (PCRR). The simulation results are obtained using 2D Finite Difference Time Domain (FDTD) method. The Photonic Bandgap (PBG) is calculated by Plane Wave Expansion (PWE) method. The proposed PCBPF is covered the entire C-Band, which extends from 1530 nm to 1565 nm. Close to 100% output efficiency is observed for the wavelength ranging from 1536 nm to 1558 nm through this simulation with 32 nm of (Full Width Half Maximum) bandwidth. The size of the device is drastically reduced from a scale of few tens of millimeters to the order of micrometers. The overall size of the proposed PCBPF is around 13 µm × 11.5 µm.