In-sung Joe

Bulk silicon photonic wire for one-chip integrated optical interconnection

We report a nano-sized silicon waveguide by forming partial silicon-on-insulator structure with SPE on bulk silicon substrate. The propagation loss is as low as 6.1 dB/cm, which is close to that of silicon-on-insulator based waveguide.

Mach-Zehnder silicon modulator on bulk silicon substrate; toward DRAM optical interface

We present a Mach-Zehnder silicon modulator fabricated on a bulk silicon substrate featuring active length of 200 µm, modulation speed up to 5 Gb/s, power consumption of 2 pJ/bit, and extinction ratio of 10 dB.

Scalable optical switch fabric for avionic networks

An optical packet switch fabric for avionic networks is described. The switch core uses waveguide grating routers (WGRs) and star couplers, i.e. only passive optical components. The only active switching elements are tunable lasers located at the transmitters. A switching time of 5 ns is experimentally demonstrated.

Si-based optical I/O for optical memory interface

Optical interconnects may provide solutions to the capacity-bandwidth trade-off of recent memory interface systems. For cost-effective optical memory interfaces, Samsung Electronics has been developing silicon photonics platforms on memory-compatible bulk-Si 300-mm wafers. The waveguide of 0.6 dB/mm propagation loss, vertical grating coupler of 2.7 dB coupling loss, modulator of 10 Gbps speed, and Ge/Si photodiode of 12.5 Gbps bandwidth have been achieved on the bulk-Si platform. 2x6.4 Gbps electrical driver circuits have been also fabricated using a CMOS process.

10 Gb/s, 1×4 optical link for DRAM interconnect

We present a 10-Gb/s, 1×4 optical link based on a DRAM-integration-ready bulk-silicon modulator for multi-drop CPU-DRAM interconnects. The bulk-silicon modulator operated at 10 Gb/s on a die, and at 5 Gb/s in a QFP package. The 1×4 optical link was limited not by signal integrity but by optical power budget, demonstrating its scalable capacity for the future multi-drop memory bus.

Scalable Optical Switches With Large Port Count Based on a Waveguide Grating Router and Passive Couplers

A wavelength-selective optical switch based on waveguide grating routers (WGRs), passive splitters, and combiners is described. Tunable lasers on the transmitter side are the only active switching elements. The WGR is operated on multiple free-spectral ranges (FSRs) to achieve increased port count and switching capacity. Switching times of less than 24 ns between wavelengths covering three FSRs are demonstrated experimentally.

High capacity optical packet switch based on a Waveguide Grating Router operated over multiple FSRs

An optical wavelength-selective packet switch based on a wavelength grating router operated on multiple free spectral ranges to achieve increased port count and switching capacity is described and demonstrated experimentally.