Single Fiber Optical IO on standard 0.35 um CMOS

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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_at_ee.duke.edu

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Home Interface Implementation Using a Single
Fiber Bi-Directional Fiber 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

Asymmetric or symmetric bandwidth link in each
direction
HUB
Home Interface
Emitter stacked on top of detector for
bi-directional link
Previous result for co-located emitter/detector
pair
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Co-Located Emitter and Photodetectorfor Single
Fiber Bi-Directional Link
Optical fiber
Thin film emitter
Thin film
detector
Si CMOS Rx and Tx Circuits

• 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.

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Transceiver Laser Driver and TIA
RCE InGaAs LED 50 mm diameter with 30mm aperture
I-MSM GaAs PD 150 mm detector diameter
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Measurements from Circuit With Integrated Stacked
Devices
RCE LED optical transmitter eye-diagram at 40
Mbps (LEDs are slow)
I-MSM photoreceiver eye diagram at 1Gbps