High speed IC designs for low power short reach optical links

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dc.contributor.advisor Ossieur, Peter en
dc.contributor.advisor Townsend, Paul D. en
dc.contributor.author Zhou, Shiyu
dc.date.accessioned 2017-06-06T12:06:48Z
dc.date.available 2017-06-06T12:06:48Z
dc.date.issued 2017
dc.date.submitted 2017
dc.identifier.citation Zhou, S. 2017. High speed IC designs for low power short reach optical links. PhD Thesis, University College Cork. en
dc.identifier.endpage 147 en
dc.identifier.uri http://hdl.handle.net/10468/4056
dc.description.abstract In 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.sponsorship Science Foundation Ireland (SFI Grants 11 /SIRG/12112, 12 /IA /1270 and 12 /RC /2276); Microelectronic Circuits Centre Ireland (MCCI, grant 2013-01) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Shiyu Zhou. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Integrated optoelectronic circuits en
dc.subject Traveling-wave devices en
dc.subject PAM4 en
dc.subject Optical transmitter en
dc.subject CMOS en
dc.subject Silicon photonics en
dc.subject Hybrid integration en
dc.title High speed IC designs for low power short reach optical links en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PHD (Engineering) en
dc.internal.availability Full text available en
dc.check.info No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Irish Photonic Integration Centre en
dc.contributor.funder Microelectronic Circuits Centre Ireland en
dc.description.status Not peer reviewed en
dc.internal.school Electrical and Electronic Engineering en
dc.internal.school Tyndall National Institute en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
ucc.workflow.supervisor peter.ossieur@tyndall.ie
dc.internal.conferring Summer 2017 en

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