Directional Decomposition of Electromagnetic and Acoustic Wave-Fields - Applications in integrated optics, exploration seismics and underwater acoustics

Electrical Engineering, Mathematics and Computer Scienc

OH contamination in optical glass fibers

Abstract only

Reflection properties of multimode interference devices

We report on the reflection properties of multimode interference (MMI) devices: we distinguish between reflection back into the input waveguides and internal resonance modes due to the occurrence of simultaneous self-images. Because of self-imaging, reflection can be extremely efficient, even in the case of MMI devices with optimized transmission. This conclusion is confirmed by the observed spectral behavior of InP-based ring lasers incorporating MMI 3 dB couplers and MMI power splitters. Several techniques are proposed to minimize the influence of these reflection

Modelling of a Microwave Induced Plasma for Glass Fibre Production

This study focuses on the electromagnetic (EM) incoupling of a microwave induced plasma (MIP) for plasma chemical vapour deposition (PCVD). To understand the PCVD process in a MIP, numerical models are constructed using the PLASIMO toolkit. The model fo- cuses on the electromagnetic energy incoupling. It uses a non-LTE argon plasma chemistry. The plasma can be considered to be two-dimensional rotationally symmetric. The model is self-consistent and includes ow and a detailed description of the incoupling of the elec- tromagnetic waves. This incoupling module solves the Maxwell equations on each cell of a finite differencing grid. The harmonic solution is used for the fields

Modelling of a Microwave Induced Plasma for Glass Fibre Production

This study focuses on the electromagnetic (EM) incoupling of a microwave induced plasma (MIP) for plasma chemical vapour deposition (PCVD). To understand the PCVD process in a MIP, numerical models are constructed using the PLASIMO toolkit. The model fo- cuses on the electromagnetic energy incoupling. It uses a non-LTE argon plasma chemistry. The plasma can be considered to be two-dimensional rotationally symmetric. The model is self-consistent and includes ow and a detailed description of the incoupling of the elec- tromagnetic waves. This incoupling module solves the Maxwell equations on each cell of a finite differencing grid. The harmonic solution is used for the fields