Graduate Thesis Or Dissertation
 

Design and Analysis of an Optical Wireless Receiver for a Hybrid WiFi Free-Space Optical (WiFO) Communication Network

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  • The increasing demand for higher data-rates in spectrum-deficient indoor WiFi networks calls for the adaptation of hybrid systems, consisting of RF and optical wireless channels. The novel hybrid WiFi Free-Space Optical (WIFO) system was introduced to enhance the wireless capacity of indoor WiFi networks. In this thesis, an optical wireless channel was designed and implemented as part of the hybrid WIFO network. An optical wireless receiver was designed using a Si-PIN photodiode with a sensitivity of 0.6A W at 850nm wavelength and the transmitter was implemented with an 850nm laser diode. The receiver achieved a bit error rate of 1e-9 for a data rate of 100Mbps at a non-directed line-of-sight distance of 2 meters from the transmitter. To achieve a higher data rate of 2Gbps, an integrated optical receiver was designed in 65nm CMOS. The integrated receiver consists of four low-noise trans-impedance amplifiers (TIA) whose outputs were coalesced, resulting in a 6dB higher signal-to-noise ratio than in the case of a single-TIA receiver. In this novel approach, the four trans-impedance amplifiers get their input photo-currents from four individual Si-PIN photodiodes, each with a capacitance of 1.6pF and sensitivity of 0.4A W at 850nm wavelength. The simulated input referred noise current of each TIA was 90nA over a bandwidth of 1GHz.
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