High speed IC designs for low power short reach optical links

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dc.check.embargoformatNot applicableen
dc.check.infoNo embargo requireden
dc.check.opt-outNot applicableen
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dc.contributor.advisorOssieur, Peteren
dc.contributor.advisorTownsend, Paul D.en
dc.contributor.authorZhou, Shiyu
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderIrish Photonic Integration Centreen
dc.contributor.funderMicroelectronic Circuits Centre Irelanden
dc.date.accessioned2017-06-06T12:06:48Z
dc.date.available2017-06-06T12:06:48Z
dc.date.issued2017
dc.date.submitted2017
dc.description.abstractIn this thesis, I have briefly introduced the background of my PhD research, current state-of-the-art design, and my PhD research objectives. Then, I demonstrate how to optimize the performance of PAM-4 transmitters based on lumped Silicon Photonic Mach-Zehnder Modulators (MZMs) for short-reach optical links. Firstly, we analyze the trade-off that occurs between extinction ratio and modulation loss when driving an MZM with a voltage swing less than the MZM’s Vπ. This is important when driver circuits are realized in deep submicron CMOS process nodes. Next, a driving scheme based upon a switched capacitor approach is proposed to maximize the achievable bandwidth of the combined lumped MZM and CMOS driver chip. This scheme allows the use of lumped MZM for high speed optical links with reduced RF driver power consumption compared to the conventional approach of driving MZMs (with transmission line based electrodes) with a power amplifier. This is critical for upcoming short-reach link standards such as 400Gb/s 802.3 Ethernet. The driver chip was fabricated using a 65nm CMOS technology and flip-chipped on top of the Silicon Photonic chip (fabricated using IMEC’s ISIPP25G technology) that contains the MZM. Open eyes with 4dB extinction ratio for a 36Gb/s (18Gbaud) PAM- 4 signal are experimentally demonstrated. The electronic driver chip has a core area of only 0.11mm 2 and consumes 236mW from 1.2V and 2.4V supply voltages. This corresponds to an energy efficiency of 6.55pJ/bit including Gray encoder and retiming, or 5.37pJ/bit for the driver circuit only. In the future, system level analysis should be carried out to investigate the critical pattern issue of the PAM4 optical transmitter. The potential solutions toward 1pJ/bit are given (lumped EAM and micro-ring modulator). In addition, the advanced modulation formats (16 QAM, discrete multitone modulation, and FFE) are presented based on the switched capacitor approach.en
dc.description.sponsorshipScience Foundation Ireland (SFI Grants 11 /SIRG/12112, 12 /IA /1270 and 12 /RC /2276); Microelectronic Circuits Centre Ireland (MCCI, grant 2013-01)en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationZhou, S. 2017. High speed IC designs for low power short reach optical links. PhD Thesis, University College Cork.en
dc.identifier.endpage147en
dc.identifier.urihttps://hdl.handle.net/10468/4056
dc.language.isoenen
dc.publisherUniversity College Corken
dc.rights© 2017, Shiyu Zhou.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectIntegrated optoelectronic circuitsen
dc.subjectTraveling-wave devicesen
dc.subjectPAM4en
dc.subjectOptical transmitteren
dc.subjectCMOSen
dc.subjectSilicon photonicsen
dc.subjectHybrid integrationen
dc.thesis.opt-outfalse
dc.titleHigh speed IC designs for low power short reach optical linksen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePHD (Engineering)en
ucc.workflow.supervisorpeter.ossieur@tyndall.ie
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