What is CLADISS-2D 

probably the fastest of comparable laser CAD tools available today.

CLADISS-2D has developed from the CLADISS model from the University of Gent. It is a comprehensive laser diode/ TWA model that takes a complete 3D description of the device structure as a starting point. A device is composed of one or more sections and the cross-section of each section can be defined in a very flexible way, so that it might be a buried-heterostructure, an active ridge waveguide or even a glass fibre.

The model will simulate the DC, time-domain and frequency domain characteristics of the device, including noise effects. The model may be used to design a wide variety of devices from simple Fabry-Perot lasers to complex multi-contact multi-section frequency tuneable DFB lasers. It takes into account many physical processes, including lateral carrier diffusion, spectral hole burning, spatial hole burning in the lateral and longitudinal direction, non-linear gain, intervalence band absorption.

The calculation engine of CLADISS-2D is based on a powerful and flexible time-domain model, from which almost all other results are derived.

A device is defined by one or more discrete sections with each section having its own electrical contract(s) and a complete description of its cross-section. The definition of the cross-section specifies the waveguiding and the electrical properties. The cross-section has typically a rectangular geometry composed of one or more slices, arranged side by side and the materials in each slice being uniform in the lateral direction. The slice is composed of layers, with each layer being a uniform material. One or more layers may be an active material containing a carrier population. One or more layers may also contain a periodic variation in the z-direction to define a Bragg reflector.

The program includes an integrated “Kappa” calculator which will model a grating of near arbitrary shape using coupled mode theory. This supports gain gratings, loss gratings as well as real index gratings.

The structure may have one or more active layers, and will model lateral carrier diffusion within each layer. Each section can have one or more electrical contacts that are connected to a drive node via a resistive network. In version 1 of CLADISS-2D, each active layer is connected resistively to the contact above. Future versions will include a more generic current spreading.

CLADISS-2D comes with sophisticated visualization tools, allowing you to view the forward, backward or total propagating fields in the longitudinal direction, as well as the cross sectional field at any point along the structure. You can visualise at a glance the power of any mode as a function z (propagation direction), as well as the mode profiles.

General
What is CLADISS-2D?
-Calculation Method 
-Structure description
-Waveguide model
-Grating model
-Electrical model
-Graphical tool