D. Shanmuga Sundar

Design and optimization of two dimensional photonic crystal based optical filter

In this paper, the channel drop filter based on two dimensional photonic crystal is proposed. The structure is made of silicon rods with the refractive index n1 = 3.4641 which are perforated in air with refractive index n2 = 1. The simulation results are obtained using 2D finite difference time domain (FDTD) method. The photonic band gap is calculated by plane wave expansion solver method. Resonant mode of the ring resonator and the filter transmission spectrum is calculated using 2D FDTD method. Full width half maximum (FWHM) bandwidth of the filter at the output transmission spectrum from 1.508 μm to 1.512 μm is 4 nm. The quality factor of the filter is 377.5 and the proposed filter design is around 21 × 15 μm which is suitable for photonic integrated circuits.

Performance Analysis of Different Micro Ring Resonators based on Optical Delay Lines

This paper, deals with design and simulation of optical delay line consisting of an array of micro-ring resonator. The work comprises the comparison of three types of delay lines namely SCISSOR, CROW and Ring-loaded MZT interferometer based delay line. Loaded MZT interferometer configuration consists of array of micro-ring resonators connected to the upper arm. In SCISSOR configuration rings are cascaded serially and the light input at the bus waveguide is evanescently coupled to the ring waveguide. In CROW light input at the bus waveguide is coupled to the ring and is also coupled between the rings. In this paper comparison of the temporal parameters such as overall delay, group delay and also the spectral characteristics such as Free Spectral Range, loss and rejection line width are made. The delay achieved by this design is on the order of picoseconds which can be used in the OTDM networks for demultiplexing the channels and in Antenna Beam Forming networks.

Design and optimization of photonic crystal fiber with improved optical characteristics

A highly birefringent photonic crystal fiber (PCF) with large nonlinearity, low dispersion and low confinement loss is designed by introducing a solid elliptical core structure with spiral lattice of circular air holes as a cladding. The dependence of different geometrical parameters, such as pitch size, diameter of air holes and arrangement of air holes are investigated. By optimizing the available parameters, the designed elliptical–spiral PCF offers high birefringence up to 0.005264, high nonlinearity up to 8683.59W−1km−1, low chromatic dispersion of − 9072.62ps/nm/km, and low confinement loss of 0.00305dB/km within a wide wavelength range of 1000–2000nm.

Design of a dual-core liquid-filled photonic crystal fiber coupler and analysis of its optical characteristics

The photonic crystal fiber coupler (PCFC) is one of the peculiar devices that play a major role in the future of optical networks. Dual-core PCFCs have many advantages over the conventional optical couplers such as more flexible design and shorter coupling length. In this paper we propose a silica-based PCFC with a hexagonal lattice structure, and important properties such as dispersion, effective refractive index, propagation characteristics, and coupling length are analyzed in comparison with benzene and chloroform liquid-filled PCFCs. The above properties are investigated under different geometrical parameters such as hole-to-hole spacing and different air hole diameter within a wide range of wavelengths. By proper adjustment of the dual-core PCFCs, the coupling lengths of 0.0006, 0.007, and 0.0008 m are achieved in the silica-, benzene-, and chloroform-filled PCFCs, respectively. Likewise, the dispersion values of −6987, −7055, and −6684  ps/(nm km) and the propagation constants of 10.9, 11.08, and 10.6 (×106)  rad/m are achieved in silica-, benzene-, and chloroform-filled PCFCs, respectively.

Hybrid Gain Medium used in Multiwavelength Ring Laser for Noise Reduction

Multiwavelength ring laser based on hybrid gain medium with semiconductor optical amplifier and erbium doped fiber amplifier plays a vital role in noise reduction. The proposed scheme is evaluated with output power, long term stability and side mode suppression using hybrid gain medium. More than 40 lines with high output power is achieved in this set up. The wavelength interval between the channels is 0.29nm. The laser can be tuned from 1545nm to 1555nm. The multiwavelength ring laser with 0dB noise power is used for broad band transmission and various applications.

AMM cladding fiber for coupled plasmonic propagation and core guidance

Dual effect of surface plasmon propagation and classical core guidance is made possible in this work with the integration of metamaterial in a fiber. Here, the alternate layers of

Performance Analysis of 200-Gb/s Low Complexity Transmission in Second Window

\hbox {TiO}_{2}

Exploration of photonic crystal circulator based on gyromagnetic properties and scaling of ferrite materials

TiO2 and Ag form anisotropic metamaterial that helps in plasmonic propagation. The designed fiber with the proposed metamaterial as a cladding supports both normal core guidance and surface guidance at different wavelength based on their anisotropy. Parameters such as dispersion and confinement loss are analyzed at different wavelength. Simulation results are obtained to confirm the proper propagation of modes.