Designing of Photonic Crystal Ring Resonator Based ADF Filter for ITU-T G.694.2 CWDM Systems
In this paper two dimensional photonic crystal ring resonator based add/drop filter is proposed. The layout of the proposed filter includes bus waveguide and drop waveguide which is coupled with the quasi-square resonator. The filter has a square lattice
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Career Point University, Kota, India [email protected] Kautilya Institute of Technology and Engineering, Jaipur, India [email protected]
Abstract. In this paper two dimensional photonic crystal ring resonator based add/drop filter is proposed. The layout of the proposed filter includes bus wave‐ guide and drop waveguide which is coupled with the quasi-square resonator. The filter has a square lattice with rods suspended in air type structure. The add/drop filter has 1500 nm add (off resonance) wavelength and 1567 nm drop (on reso‐ nance) wavelength with drop efficiency 95%. This type of filter is mainly used in CWDM system. The size of the filter is very compact 11.1*10 μm2. The designed filter has quality factor of 3134. The layout of filter is designed using a layout designer tool. OptiFDTD software is used for the designing and simulation of filter. Keywords: Photonic crystals (Phc) · One dimension (1D) · Two dimension (2D) · Three dimension (3D) · Photonic crystal ring resonator (PCRR) · Linear waveguide · Photonic · Add and drop filter (ADFs) · Coarse wavelength division multiplexing (CWDM) · Plane wave expansion method (PWE) · finite difference time domain method (FDTD)
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Introduction
Photonic Crystal (PC) is a natural periodic material in which periodicity is due to the periodically arranged dielectric substrate. Depending upon the periodicity of photonic crystal, it is further classified into three categories 1D, 2D and 3D. One of the an impor‐ tant characteristic of crystal is photonic band gap. Inside the photonic crystal, light is traveled by using band gap characteristics. Band gap of a crystal is the region inside the spectrum which does not allow the propagation of photons. But by changing or making some defects into the crystal, this inhibited range of frequency is converted into the propagating band. The width of band-gap depends upon the difference between the two dielectric materials of the crystal. The property of photonic crystal provides manipula‐ tion, confinement as well as controlling of light and therefore it is used for the designing of various compact and ultra compact devices. Optical filters, demultiplexers, sensors and multiplexers are the most commonly used optical devices in the field of integrated optical circuits [1].
© Springer Nature Singapore Pte Ltd. 2016 A. Unal et al. (Eds.): SmartCom 2016, CCIS 628, pp. 39–46, 2016. DOI: 10.1007/978-981-10-3433-6_5
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N. Singh and K.C. Roy
One of the photonic crystal based optical filtering device is add/drop filter. It receives prime considerations in the field of optical filtering because this filter is also act as a demultiplexer to reject a single channel or multiple channels. The function of ADF filter is to drop or select the desired wavelength from CWDM system. In Fig. 1 optical communication network is shown, in which different wavelengths are sent from head end to different places for respective applications and these wavelengths are dropped to the particular substations by using of add/drop filter [2].
Fig. 1. Optical networks [
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