Single Fiber Optical IO on standard 0.35 um CMOS Nan Marie Jokerst Martin A. Brooke Duke University Department of Electrical and Computer Engineering
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
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
Transceiver: Laser Driver and TIA RCE InGaAs LED 50 m diameter with 30 m aperture I-MSM GaAs PD 150 m detector diameter
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)