The RSoft Photonic Device Tools™ Arrayed Waveguide Grating (AWG) Utility™ has been improved and expanded in v2015.06. New features include:
- Ability to easily and self-consistently switch between 2D, 3D, 3D Effective Index Method (EIM)
- Ability to simulate AWGs in any material system, including pre-defined silica and silicon
- Improved and simplified simulation flow making advanced simulation possible
- Increased layout robustness
In this example, we illustrate a 3D EIM simulation of a Si3N4-based AWG.
As with most optical devices, it is highly desirable for AWGs to have low loss, especially for low power applications. Typical losses include fiber-to-chip coupling loss, material loss, bending loss, waveguide scattering loss, and the transition loss between the FPR (free propagation region) and the arrayed waveguides. An ultra-thin core waveguide AWG1,2, as illustrated in Fig. 1, uses a wide single-mode waveguide which reduces scattering losses due to sidewall imperfections, and increases the coupling from a typical fiber mode due to the large mode size.