Photonic crystal ring resonator-based add drop filters: a review (original) (raw)
Related papers
Optical add-drop filters based on photonic crystal ring resonators
Optics Express, 2007
We present here an optical add-drop filter (ADF) design based on ultra-compact photonic crystal ring resonators (PCRRs). The normalized transmission spectra for single-ring and dual-ring configurations have been investigated by using the two-dimensional finite-difference time-domain (FDTD) technique in a square lattice dielectric-rod photonic-crystal structure. With the introduction of four scatterers at the corners of quasisquare-ring PCRR, high wavelength selectivity and close to 100% drop efficiency can be obtained. Both backward-and forward-dropping were achieved by controlling the coupling efficiency between two PCRR rings for resonant modes with different symmetry. The resonant-mode quality factor Q and the wavelength tunability were also analyzed, opening opportunities for PCRRs as ultra-compact filters, optical add-drop multiplexers, electrooptical N x N switches and electrooptical modulators.
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.
Tunable Optical Add/Drop Filter for CWDM Systems Using Photonic Crystal Ring Resonator
Journal of Electronic Materials, 2019
In this paper an add/drop filter based on a two dimensional (2D) photonic crystal ring resonator (PCRR) is proposed and its performance is studied. This device is comprised of a hexagonal PCRR between two parallel waveguides formed by creating line defects in a 2D lattice structure with an array of 20 9 20 Si (Silicon) rods in air host. The lattice constant a is 636 nm and the radius of silicon (Si) rods r is 0.2a. The size of the add/drop filter is 6 lm 9 6 lm. We have achieved nearer to 100% dropping efficiency when the wavelength (k) of the optical input signal is 1.55 lm. Optical signal can be made to drop at a different port by varying its wavelength or radius of Si rods. Simulation of the device is performed using a licensed RSoft FullWAVE tool based on a finite difference time domain (FDTD) simulator. The proposed structure could be used as an add/drop filter in the wavelength division multiplexing.
Analysis of CWDM network with photonic crystal ring resonator based add drop filter
2012
In this paper, a four channel Coarse Wavelength Division Multiplexing (CWDM) system is designed by incorporating the Two Dimensional (2D) Photonic Crystal Ring Resonator (PCRR) based Add Drop Filter (ADF). The performance parameters of the network such as the received output power, Bit Error Rate (BER) and Q factor are examined for the bit rate of 2.5 Gbps over the fiber length of 50 km and 400 km. The sensitivity of the receiver to get the BER of 10-12 is-19 dBm whose corresponding Q factor is 7. The network design and its simulations are carried out by Optisystem simulator, Optiwave.
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...
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.
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.
Coupled-mode analysis of photonic crystal add-drop filters based on ring resonators
JOSA B, 2008
We propose coupled-mode analysis of a two-dimensional photonic crystal add-drop filter based on ring resonators, which can be applicable to photonic integrated circuits. Mechanism of this proposed add-drop filter is analogous to that of ring resonators resonance, which involves interaction of waveguides and resonators. Simulation results of this filter obtained from the finite-difference time-domain method are consistent with those from the coupled-mode theory. Total transmission up to 99% is verified by both methods.
Quality Factor Enhancement of Optical Channel Drop Filters Based on Photonic Crystal Ring Resonators
International Journal of Optics and Photonics
In this paper, a channel drop ring resonator filter based on two dimensional photonic crystal is proposed which is suitable for all optical communication systems. The multilayer of silicon rods in the center of resonant ring enables one to adjust resonant wavelength of the ring and enhance power coupling efficiency between ring and waveguide. Refractive index and radius of multilayer rods inside the ring are important factors which help one to enhance the desired output parameters. The proposed structure is capable of presenting high quality factor near 1937 in conjunction with 0.8 nm pass band. The high coupling efficiency 99% is another advantage of the proposed filter.