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MS Final Exam – Siyuan Chen

A 400Mb/s 850nm FSO Link based on CMOS Integrated Receiver for Hybrid and Optical Femtocells

The increasing demand for higher data-rates is challenging to satisfy with spectrum- deficient indoor WiFi networks. A novel hybrid WiFi Free-Space Optical (WIFO) system has been proposed to enhance the wireless capacity of indoor WiFi networks. In this thesis, an integrated optical wireless receiver is designed and integrated in 65-nm CMOS technology as a part of the hybrid WIFO network. Signal-to-noise (SNR) at trans- impedance amplifier(TIA) output is increased due to correlated signal addition while noise from different TIA is uncorrelated. A distributed TIA array structure with four Si-PIN photodiodes is introduced to improve SNR by 6dB, each with a capacitance of 1.6pF and sensitivity of 0.4A/W at 850nm wavelength. Simulations suggest an input- referred current noise of 12nA (with 200 MHz integration BW). The receiver and a low cost FSO transmitter using commercial off-the-shelf components, achieve 400 Mb/s data rates at distances beyond 1m. The receiver consumes 80 mW from a 1.2V supply.

Major Advisor: Arun Natarajan
Committee: Alan Wang
Committee: Matthew Johnston
GCR: Leonard Coop

Tuesday, December 4, 2018 at 10:00am to 12:00pm


Kelley Engineering Center, 1005
110 SW Park Terrace, Corvallis, OR 97331

Event Type

Lecture or Presentation

Event Topic

Research

Organization
College of Engineering, Electrical Engineering and Computer Science
Contact Name

Calvin Hughes

Contact Email

Calvin.Hughes@oregonstate.edu

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