Transmission Characteristics of Tuneable Optical Filters Using Optical Ring Resonator with PCF Resonance Loop (original) (raw)

Characteristics of tuneable optical filters using optical ring resonator with PCF resonance loop

A theoretical analysis of a tuneable optical filter is presented by proposing an optical ring resonator (ORR) using photonic crystal fiber (PCF) as the resonance loop. The influences of the characteristic parameters of the PCF on the filter response have been analyzed under steady-state condition of the ORR. It is shown that the tuneability of the filter is mainly achieved by changing the modulation frequency of the light signal applied to the resonator. The analyses have shown that the sharpness and the depth of the filter response are controlled by parameters such as amplitude modulation index of applied field, the coupling coefficient of the ORR, and hole-spacing and air-filling ratio of the PCF, respectively. When transmission coefficient of the loop approaches the coupling coefficient, the filter response enhances sharply with PCF parameters. The depth and the full-width at half-maximum (FWHM) of the response strongly depend on the number of field circulations in the resonator loop. With the proposed tuneability scheme for optical filter, we achieved an FWHM of ∼1.55 nm. The obtained results may be utilized in designing optical add/drop filters used in WDM communication systems.

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.

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.

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.

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.

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.

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.

Design of Micro Loop Ring Resonator Tunable Filter Based on PCF

2008

By proposing a microloop ring resonator built on photonic crystal fiber (PCF), we presented an analysis of a tunable optical filter by considering steady state response of the resonator with a loop length of about 628 mum. By analyzing macrobending characteristics of PCF, we have shown the influence of their characteristic parameters on the filter response. It is shown that the tunability of the filter is mainly achieved by changing the modulation frequency of the field applied to the resonator. The analyses have shown the sharpness and the depth of the filter response are controlled by the field amplitude and the coupling coefficient of the directional coupler, respectively. The full-width half-maximum of the response strongly depends on the number of field circulations in the resonator loop. With the proposed scheme for optical filter, we achieved FWHM of 0.1 nm.

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.