1. Single Fiber Optical IO on standard 0.35 um CMOS Nan Marie Jokerst Martin A. Brooke Duke University Department of Electrical and Computer Engineering email: mbrooke@ee.duke.edu

2. HUB Asymmetric or symmetric bandwidth link in each direction Home Interface Emitter stacked on top of detector for bi-directional link Co-located, stacked thin film emitters and detectors for bi-directional interface Single fiber between the hub and home Alignment tolerant for low cost packaging Previous result for co-located emitter/detector pair Home Interface Implementation Using a Single Fiber Bi-Directional Fiber Link

3. Si CMOS Rx and Tx Circuits Thin film emitter Thin film detector Optical fiber The co-location of the emitter and detector enables single fiber bi-directional communication For asymmetric, low cost interconnection, detector will run at 1 Gbps, and LED emitter at ~100 Mbps. For faster emitter, edge emitter and mirror will be used. Co-Located Emitter and Photodetector for Single Fiber Bi-Directional Link

4. Transceiver: Laser Driver and TIA RCE InGaAs LED 50  m diameter with 30  m aperture I-MSM GaAs PD 150  m detector diameter

5. Measurements from Circuit With Integrated Stacked Devices I-MSM photoreceiver eye diagram at 1Gbps RCE LED optical transmitter eye- diagram at 40 Mbps (LEDs are slow)