THESIS
2008
xix, 113 leaves : ill. ; 30 cm
Abstract
The inherent limitations from the metallic interconnect hinder further improvement in the interconnection networks performance (throughput, power dissipation and latency) for next-generation high-performance many-core computing. Silicon photonic interconnects that are compatible with complementary metal-oxide-semiconductor (CMOS) fabrication processes offers an alternative signal transmission solution to some of the critical issues....[
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The inherent limitations from the metallic interconnect hinder further improvement in the interconnection networks performance (throughput, power dissipation and latency) for next-generation high-performance many-core computing. Silicon photonic interconnects that are compatible with complementary metal-oxide-semiconductor (CMOS) fabrication processes offers an alternative signal transmission solution to some of the critical issues.
In this thesis, we design and demonstrate cross-connect photonic filters and switches using micrometer-sized resonators coupled to low-loss low-crosstalk waveguide crossings in silicon-on-insulator substrate. These devices can be readily cascaded into one-dimensional and two-dimensional cross-connects as building blocks for photonic integrated circuits on a chip.
Our designed crossing is based on the self-image property of multimode interference (MMI). We adopt beam-propagation-method (BPM) and two-dimensional (2-D) finite-difference time-domain (FDTD) method to simulate the optical performance of our designed MMI crossings in silicon-on-insulator (SOI) substrate. Our simulations suggest that the MMI crossing exhibits only – 0.12-dB insertion loss and below – 40-dB optical leakage power to the cross-port (crosstalk).
We design and experimentally investigate the microring resonator cross-connect filters using MMI-based waveguide crossings in SOI substrate. Key merits of our cross-connect filter using MMI crossings are two folds: (i) symmetric resonance line shapes in the drop-port transmission, and (ii) relative low crosstalk level. As a proof of concept, we also fabricate linear-cascaded four-channel filters and 2 Χ 2 cross-grid filter array. We also adopt transfer matrix method to analyze the filter response of a cascaded N Χ N microring-based cross-connect filters.
We propose and design a non-blocking 5 Χ 5 switch as a building block for potential 2-D mesh/torus interconnection network-on-chip. The switch comprises 25 reconfigurable microring resonators, each coupled to a MMI crossing in a grid. We numerically analyze the performance of the switch in terms of transmission optical loss, power consumption and switching time.
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