Modeling and Design of Realistic Si3N4-based Integrated Optical Programmable Power Splitter

Share/Save/Bookmark

Uranus, H.P. and Hoekstra, H.J.W.M. and Stoffer, R. (2010) Modeling and Design of Realistic Si3N4-based Integrated Optical Programmable Power Splitter. Journal of Nonlinear Optical Physics & Materials, 19 (2). pp. 255-268. ISSN 0218-8635

[img]PDF
Restricted to UT campus only
: Request a copy
621Kb
Abstract:Controllable splitting of optical power with a large splitting ratio range is often required in an integrated optical chip, e.g. for the readout of phase-shift in a slow-light sensor. In this work, we report the modeling and design of an integrated optical programmable power splitter consisting of a Y-junction with a programmable phase-shifter cascaded to a directional coupler. We used a vectorial mode solver, and a combination of a transfer matrix method with a 3D vectorial coupled-mode theory (CMT) to compute the power transfer ratio of a realistic device structure made of Si3N4, TEOS, and SiO2 grown on a Si substrate. In the simulations, waveguide attenuation values derived from the measured attenuation of a prefabricated test wafer, have been taken into account. Vectorial modal fields of individual waveguides, as computed by a mode solver, were used as the basis for the CMT computation. In the simulation, an operational wavelength around 632.8 nm was assumed. Our simulations reveal that maximum power splitting ratio can be achieved when the directional coupler is operated as a 3-dB coupler with the phase-shifter set to produce a 90° phase-shift. The required coupler length for such desired operating condition is highly-dependent on the gap size. On the other hand, the inclusion of the waveguide loss and the non-parallel section of the directional coupler into the model only slightly affect the results.
Item Type:Article
Copyright:© 2010 World Scientific
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/75619
Official URL:http://dx.doi.org/10.1142/S0218863510005236
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page