On-chip Dual-band Higher Order Mode Pass Filter using Silicon Subwavelength Grating
In mode division multiplexing (MDM) technology multi-band higher order mode (HOM) pass filters are rarely introduced. However, these filters will support the MDM technology to be universal for all available wavelength bands used in fiber optic communication systems. In this work, two TE1 mode pass filters (MF1 and MF2) have been proposed using silicon subwavelength grating (SSWG) structures embedded in the multi-mode waveguide to operate in a dual band (O-band and C-band). The MF1 with gratings of two distinct grating periods and a device length of only 23