Analysis and optimisation of semiconductor reflective modulators for optical networks

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dc.contributor.advisor Townsend, Paul D. en Naughton, Alan J. 2015-08-18T09:11:52Z 2015-08-18T09:11:52Z 2014 2014
dc.identifier.citation Naughton, A. J. 2014. Analysis and optimisation of semiconductor reflective modulators for optical networks. PhD Thesis, University College Cork. en
dc.identifier.endpage 195
dc.description.abstract Reflective modulators based on the combination of an electroabsorption modulator (EAM) and semiconductor optical amplifier (SOA) are attractive devices for applications in long reach carrier distributed passive optical networks (PONs) due to the gain provided by the SOA and the high speed and low chirp modulation of the EAM. Integrated R-EAM-SOAs have experimentally shown two unexpected and unintuitive characteristics which are not observed in a single pass transmission SOA: the clamping of the output power of the device around a maximum value and low patterning distortion despite the SOA being in a regime of gain saturation. In this thesis a detailed analysis is carried out using both experimental measurements and modelling in order to understand these phenomena. For the first time it is shown that both the internal loss between SOA and R-EAM and the SOA gain play an integral role in the behaviour of gain saturated R-EAM-SOAs. Internal loss and SOA gain are also optimised for use in a carrier distributed PONs in order to access both the positive effect of output power clamping, and hence upstream dynamic range reduction, combined with low patterning operation of the SOA Reflective concepts are also gaining interest for metro transport networks and short reach, high bit rate, inter-datacentre links. Moving the optical carrier generation away from the transmitter also has potential advantages for these applications as it avoids the need for cooled photonics being placed directly on hot router line-cards. A detailed analysis is carried out in this thesis on a novel colourless reflective duobinary modulator, which would enable wavelength flexibility in a power-efficient reflective metro node. en
dc.description.sponsorship Science Foundation Ireland (06/IN/1969 and 12/IA/1270); European Commission (EU projects: C3PO and PIEMAN) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2014, Alan J. Naughton. en
dc.rights.uri en
dc.subject Electro-absorption modulator (EAM) en
dc.subject Passive optical network (PON) en
dc.subject Reflective modulator en
dc.subject Semiconductor optical amplifier en
dc.subject Duobinary en
dc.title Analysis and optimisation of semiconductor reflective modulators for optical networks en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder European Commission en
dc.description.status Not peer reviewed en Physics en 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
dc.internal.conferring Autumn Conferring 2014

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© 2014, Alan J. Naughton. Except where otherwise noted, this item's license is described as © 2014, Alan J. Naughton.
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