Propagation Characteristics Of Optical Waveguides Research Articles

Determination of Propagation Characteristics of Crucial Planar Wave Guide Structures by Finite Difference Method

Based on finite difference (FD) method, recently applied to investigate propagation characteristics of optical waveguides, we verify its applicability to predict the electric field and propagation parameter of planar waveguide for the entire range of normalized frequencies. As a test case, we crosscheck our FD result for symmetric step index planar waveguide and then predict the propagation characteristics of crucial planar waveguide structures like exponential index and Epstein layer model profile. Our findings show high degree of accuracy when compared with published results.

A Multidomain Pseudospectral Mode Solver for Optical Waveguide Analysis

We propose a pseudospectral mode solver for optical waveguide mode analysis formulated by the frequency-domain Maxwell equations. Special attention is paid upon identifying the required boundary operator for the formulation and the relationships between the derived operator and the physical boundary conditions. These theoretical results are adopted into a Legendre pseudospectral multidomain computational framework to compute the propagation characteristics of optical waveguides. Numerical experiments are conducted, and the expected spectral convergence of the scheme is observed for smooth problems and for problems having field jumps at material interfaces. For dielectric waveguides with sharp corners, the spectral convergence is lost due to the singular nature of fields at the corner. Nevertheless, compared with other methods, the present formulation remains as an efficient approach to obtain waveguide modes.

Complex finite difference method applied to the analysis of semiconductor lasers

It is shown that the finite difference method may be extended to study the propagation characteristics of optical waveguides whose cross-sections contain regions of complex local refractive index, representing gain or loss. Complex propagation constants are calculated for a range of stripe geometry laser structures and compared with those obtained from other methods. When used in conjunction with a simultaneous finite difference solution of the carrier rate equation, the complex optical waveguide method provides a powerful self-consistent laser model.

Electromagnetics of Integrated Optical Waveguides (Invited Paper)

We have presented electromagnetic analyses of a number of optical waveguides used in integrated optical devices. The attempt in each case has been to consider a simple refractive index distribution and bring out most of the important propagation characteristics of the waveguide. Some of the analyses will be quite general in nature e g, the study of leaky modes, the use of the recently-developed matrix method for determining the propagation characteristics of optical waveguides, the application of perturbation method for the analysis of non-separable profiles etc and would be applicable to optical fibres also.

Matrix method for determining propagation characteristics of optical waveguides

We have transformed the scalar wave equation into a matrix eigenvalue equation, the diagonalization of which gives the guided modes and a discrete representation of the radiation modes. The method is simple and can be used for arbitrary refractive index profiles.

Optical pulse broadening in long fibre waveguides

As a result of research, the propagation characteristics of optical waveguides are becoming well enough understood for system evaluation. In this paper material and structural properties of the waveguide are related to measurements made on present experimental waveguides. Among the conclusions drawn from this work are that intermodal dispersion provides the dominant pulse broadening contribution but that this has been reduced to the nanosecond region by radial index gradient control. For present source spectral bandwidths, material dispersion is not a major contribution to pulse broadening. Waveguides up to 3 km long can be made with negligible intrinsic mode coupling. This gives rise to the possibility of either internal or external control to increase the information carrying capacity of the waveguide. External control has already been demonstrated. However, additional work is required to make this practical.