In this Letter, we demonstrate theoretically the design of a polarization-insensitive echelle grating demultiplexer on a nanophotonic silicon-on-insulator platform. The polarization-insensitive performance is achieved through a dual-grating system, which utilizes different concave gratings for different polarizations. The first concave grating acts as a polarization to beam splitter as well, allowing light with the other polarization to pass through and be reflected by the second grating, which is designed separately; thus the same spectral responses are obtained for the two polarizations.
© 2010 Optical Society of America
Diffraction and Gratings
Original Manuscript: January 8, 2010
Revised Manuscript: March 20, 2010
Manuscript Accepted: April 2, 2010
Published: May 6, 2010
Ning Zhu, "Proposal of a polarization-insensitive echelle grating demultiplexer based on a nanophotonic silicon-on-insulator platform through a dual-grating system," Opt. Lett. 35, 1599-1601 (2010)