The paper presents an analysis of thermo-optic phase shifters in silicon-on-insulator (SOI) waveguide structures. It gives recommendations to provide high tuning characteristics at minimum power requirements. Then, this analysis is applied to the description of a novel type of reconfigurable optical add/drop multiplexer (ROADM) utilizing multi-reflector (MR) beam expanders and thermo-optic tuning in SOI structures. It is intended for use in high dense wavelength-division-multiplexing (HDWDM) flexible fiber-optic networks having multi-hundreds wavelength channels and advanced ITU grids (12.5 GHz, 25 GHz, 50 GHz).
In this paper a detailed investigation of the
distributed Bragg reflectors in GaAs-based vertical cavity surface
emitting lasers is presented. The influence of layer doping
concentration, number of periods, oxide aperture and
AlxGa1-xAs alloy composition on output emission power
and threshold current has been found. Both oxidized and non
oxidized structures have been considered. A number of
interpolation curves are extracted and presented for design and
fabrication purposes. Although the results are presented for
GaAs-based structures, the theoretical approach is very general.
In this paper, the Floquet-Bloch theory (FBT) has been applied to the accurate simulation of distributed Bragg reflectors in vertical cavity surface emitting lasers (VCSELs). A number of comparisons with other methods largely used in commercial CAD tools is presented. Performance predictions for long-wavelength GaInAsP VCSELs are derived.
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