Theoretical Investigation for Reducing Polarization Sensitivity in Si-Nanowire-Based Arrayed-Waveguide Grating (de)Multiplexer With Polarization-Beam-Splitters and Reflectors
2009 (English)In: IEEE Journal of Quantum Electronics, ISSN 0018-9197, Vol. 45, no 5-6, 654-660 p.Article in journal (Refereed) Published
A novel design for reducing polarization sensitivity in silicon-on-insulator-based arrayed-waveguide grating (AWG) (de)multiplexer is presented. Each arrayed waveguide has two sections separated by a polarization beam splitter (PBS). These two sections have different core widths and length differences. With these PBSs, one polarization is reflected and the other one goes through. The through polarization enters the second section and is then reflected by a reflector at the end of the second section of the arrayed waveguide. The theoretical simulation shows that one can diminish greatly the polarization sensitivity of both the central channel wavelength and the channel spacing by optimizing the core width and length difference of the second section. The design procedure and formulas are given and an appropriate diffraction order is chosen to obtain a good fabrication tolerance. As an example, an ultrasmall (82.2 x 85.1 mu m(2)) AWG (de)multiplexer with eight channels and a channel spacing of 4 nm is designed to have minimized polarization sensitivity and Bragg-grating PBSs and photonic crystal reflectors are used.
Place, publisher, year, edition, pages
2009. Vol. 45, no 5-6, 654-660 p.
Arrayed-waveguide grating (AWG), polarization-insensitive, reflective, Si nanowire, planar lightwave circuits, insulator photonic wires, mode converter, design, wavelength, demultiplexer, fabrication, coupler
IdentifiersURN: urn:nbn:se:kth:diva-18461DOI: 10.1109/jqe.2009.2013142ISI: 000266454300029ScopusID: 2-s2.0-66149114084OAI: oai:DiVA.org:kth-18461DiVA: diva2:336508
QC 201005252010-08-052010-08-052013-11-19Bibliographically approved