Abstract
Mode-division multiplexing (MDM) is an emerging multiple-input multiple-output method, utilizing multimode waveguides to increase channel numbers. In the past, silicon-on-insulator (SOI) devices have been primarily focused on single-mode waveguides. We present the design and fabrication of a two-mode SOI ring resonator for MDM systems. By optimizing the device parameters, we have ensured that each mode is treated equally within the ring. Using adiabatic Bezier curves in the ring bends, our ring demonstrated a signal-to-crosstalk ratio above 18 dB for both modes at the through and drop ports. We conclude that the ring resonator has the potential for filtering and switching for MDM systems on SOI.
Highlights
Silicon-on-insulator (SOI) wire waveguides have been identified to potentially replace copper wires for intra-chip communication
The advantage of a mode-division multiplexing (MDM) system is that it requires only one laser source to be coupled to the chip, which is divided into N waveguides via a power splitter, and modulated using integrated silicon modulators [2]
The coupling coefficients κ and t are heavily dependant on the overlap of the evanescent fields between the two waveguides, the lengths for complete coupling (Lc) for each mode can differ by nearly an order of magnitude depending on the waveguide separation
Summary
Silicon-on-insulator (SOI) wire waveguides have been identified to potentially replace copper wires for intra-chip communication. In SOI systems WDM does have inherent drawbacks, as it requires the operation and alignment of many individual laser sources Another form of multiple-input multiple-output transmission is mode-division multiplexing (MDM), where channels are separated spatially by multiplexing them onto the different modes of a waveguide. The waveguide in these structures was designed wide enough to be multimode when straight, but the authors ensured that the higherorder modes were lossy in the ring bends to avoid resonance of any mode but the TE00 for single-mode operation in the device Such a device is incompatible with MDM systems. For the first time we demonstrate a ring resonator designed to support two modes, TE00 and TE01, for MDM applications Such a device could drastically increase the complexity and functionality of on-chip MDM communications by allowing for mode selective add/drop filtering. The design and optimization of the (de)multiplexers and ring bends are reported
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