Performance evaluation of an optical drop filter based on simple homogeneous photonics crystal resonator (original) (raw)

Photonic Crystal Drop Filter Exploiting Resonant Cavity Configuration

IEEE Transactions on Nanotechnology

Band dropping devices are widely used in WDM application. In this paper the design of a two-dimensional photonic crystal drop filter is proposed. Different from the configuration reported in literature which are realized by means of a photonic bandgap waveguide and one or more resonant cavities, able to select a signal at desired frequency, the proposed drop filters exploits a novel system of point defects. The design is based on the accurate analysis of higher order resonant modes supported by the system and their parities. The temporal and spectral behavior of the device is studied using plane wave expansion (PWE) and FDTD methods.

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.

ARTICLE IN PRESS G Model T-shaped channel drop filter based on photonic crystal ring resonator

Photonic crystal ring resonators are promising candidates for realizing all optical filters with acceptable transmission efficiency and quality factor values. In this paper, by putting a12-fold quasi crystal at the middle of on 7 × 7 square cavity we created a ring resonator structure and designed a T-shaped channel drop filter. The drop wavelength of our filter is at 1551 nm, with transmission efficiency and quality factor equal to 90% and 387. Our structure is composed of dielectric rods immersed in air. Because in this kind of structures the dominant band gap is in TM mode, all of our simulations have been done in TM mode. The total footprint of our filter is 242.4 m 2 , which makes it suitable for all optical integrated circuits.

New Design of T-Shaped Channel Drop Filter Based on Photonic Crystal Ring Resonator

Nanoscience and Nanotechnology, 2016

In this paper, we propose a new design of T-shaped channel drop filter using photonic crystal ring resonator. The proposed structure is composed of two photonic crystal waveguides and a square photonic crystal ring resonator with circular inner rods configuration. Calculations of band structure and normalized transmission spectra are done by plane wave expansion (PWE) and finite difference time domain (FDTD) methods, respectively. According to the results, we note that 100% dropping efficiency with quality factor of 502 is achievable at wavelength λ=1.578487 μm. The effect of varying different parameters on the resonant wavelength and dropping efficiency of the filter is investigated. These parameters include refractive index, radius of inner and whole rods.

An optical channel drop filter based on 2D photonic crystal ring resonator

Journal of Electromagnetic Waves and Applications, 2016

Photonic crystal ring resonator-based add drop filters: a review

Optical Engineering, 2013

The add drop filter (ADF) is one of the most significant devices for coarse wavelength division multiplexing (CWDM) systems to add and/ or drop a required channel individually from multiplexed output channels without disturbing other channels. The important parameters of the ADF are coupling efficiency, dropping efficiency, passband width and Q factor. Photonic crystal (PC)-based optical devices have attracted great interest due to their compactness, speed of operation, long life period, suitability for photonic integrated circuits, and future optical networks. Here, an extensive overview of a photonic crystal ring resonator (PCRR)-based ADF using a different shape of ring resonator is presented, and its corresponding functional parameters are discussed. Finally, the designed circular PCRR-based ADF for an ITU-T G 694.2 CWDM system is presented. Approximately 100% of coupling efficiency and dropping efficiency, 114.69 of Q factor, and 13 nm of passband width is obtained through simulation, which outperforms the reported one.

T-shaped channel-drop filters using photonic crystal ring resonators

Physica E: Low- …, 2008

In this paper, we demonstrate a new type of 2D photonic crystal T-shaped channel-drop filters based on ring resonators with high normalized transmission; we investigate parameters which affects resonant frequency in these channel-drop filters. These parameters include dielectric constant of inner rods, coupling rods and whole rods of the structure as well as radius of the coupling rods and scatterer rods. At dropping case, the power transferred to the drop waveguide and the power remaining in the bus waveguide are found by finite difference time domain (FDTD) method to be over 95% and less than 5%, respectively.

Photonic crystal add–drop filter: a review on principles and applications

2020

Add–drop flter (ADF) is a key component in optical integrated circuits that can be used in all-optical communication networks and wavelength division multiplexing (WDM) systems. The quality factor, coupling efciency, transmission efciency and coupling length are important parameters in add–drop flters. Photonic crystal (PC) optical devices have become popular among researchers because their structure is suitable to embed into optical circuits. This paper covers a comprehensive review of the principle structure of ADF, coupled mode theory (CMT), types and recent applications in WDMs, accelerometer and bio/chemical sensors. Although there are some diferent categories of photonic crystal ring resonator-based ADF in general, all of them can be divided into photonic to two class of non-circular and circular. This article is reported a comprehensive study about ADF and improvement of these ADF.

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.

Performance evaluation of an optical drop filter based on simple homogeneous photonics crystal resonator (original) (raw)

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