Graduate Thesis Or Dissertation
 

Design Techniques of High-Speed Silicon Photonics Transceiver

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9w032791r

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  • The rapid scaling of network bandwidth and data center throughput has motivated the wide adoption of high speed transceivers. Silicon photonics (Si-Photonic) is one of the most promising techniques to realize tightly integrated optical transceivers for next-generation high speed I O standards. This dissertation focuses on the design techniques of Si-Photonic transceivers for a data rate of 25Gb s and beyond. A 25Gb s transmitter design is demonstrated based on depletion-mode Microring modulators. An AC-coupled differential driver is proposed to realize 4×VDD output swing as well as tunable DC-biasing. The proposed transmitter incorporates 2-tap asymmetric pre-emphasis to effectively cancel the optical nonlinearity of the Microring modulator. An average-power-based dynamic wavelength stabilization loop is also demonstrated to compensate for thermal induced resonant wavelength drift. At 25Gb s operation, each transmitter channel consumes 113.5mW and maintains 7dB extinction ratio with a 4.4V[subscript pp-diff] output swing in the presence of thermal fluctuations. On the receiver side, the design of a 25Gb s PAM2, 40Gb s PAM4 Si-Photonic receiver design is investigated. The proposed receiver design employs a pseudo-different trans-impedance amplifier (TIA) as well as a direct-feedback decision feedback equalizer (DFE) to enhance the sensitivity for both PAM2 and PAM4 operation.
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