Design a Photonic Crystal Narrowband Band Pass Filter at a Wavelength of 1570 nm for Fiber Optic Communication Applications

Abstract

The optical communications have been the backbone of the most dramatic developments in telecommunications systems in the past two decades, so that the current world of communications is unthinkable without the infrastructure of ber optic networks. Also, the speed and bandwidth of optical devices have expanded the development of optical telecommunication systems, so the design, simulation and fabrication of optical devices have become more and more respected by researchers in this eld. In this paper, a design for optical narrow Band Pass Filter (BPF) using two-dimensional (2D) photonic crystals (PCs) is presented that are suitable for applications in optical ber communications (third window) in Wavelength-Division Multiplexing (WDM) systems. BPF was simulated by a two-dimensional timing method (FDTD) Finite-difference time-domain (FDTD). Also, the plane-wave expansion (PWE) method was used to evaluate the bands and calculate the Photonic Band Gap. Simulation results show this desired structure, acts as a very sharp optical BPF in the central wavelength of 1550 nm (In order to minimize attenuation). Normal voltage transmission e ciency, full width at half maximum (FWHM), and Focal Plane Module (FPM) for proposed BPF were 94.8%, 2583 and 0.6 nm, respectively.

Design of Channel Drop Filters Based on Photonic Crystal with a Dielectric Column with Large Radius inside Ring Resonator

“…Eight-channel CDFs with eight PhC ring resonators result in a high Q factor of 5150 and a low average transmissivity of 70.4%, causing high energy consumption [23]. Recently, a ring resonator optical cavity with a square lattice was proposed with a transmittance of 97.4% and a Q factor of 4268, but the characteristics of the multi-channel remain to be investigated for improving utilization efficiency [24]. CDFs with three channel sections and line-defect waveguides has been proposed, and an average drop efficiency of 88% and a Q factor of 4783 have been achieved [25], which has enormous potential to make further progress.…”