Integrated spot size converters for InP based photonic systems

Wieczorek, Andreas

Integrated spot size converters for InP based photonic systems

dc.check.embargoformat	E-thesis on CORA only	en
dc.check.opt-out	Not applicable	en
dc.check.reason	This thesis is due for publication or the author is actively seeking to publish this material	en
dc.contributor.advisor	Corbett, Brian	en
dc.contributor.advisor	Peters, Frank H.	en
dc.contributor.author	Wieczorek, Andreas
dc.contributor.funder	Science Foundation Ireland	en
dc.date.accessioned	2013-07-10T08:48:30Z
dc.date.available	2014-07-11T04:00:07Z
dc.date.issued	2013
dc.date.submitted	2013
dc.description.abstract	The ever increasing demand for broadband communications requires sophisticated devices. Photonic integrated circuits (PICs) are an approach that fulfills those requirements. PICs enable the integration of different optical modules on a single chip. Low loss fiber coupling and simplified packaging are key issues in keeping the price of PICs at a low level. Integrated spot size converters (SSC) offer an opportunity to accomplish this. Design, fabrication and characterization of SSCs based on an asymmetric twin waveguide (ATG) at a wavelength of 1.55 μm are the main elements of this dissertation. It is theoretically and experimentally shown that a passive ATG facilitates a polarization filter mechanism. A reproducible InP process guideline is developed that achieves vertical waveguides with smooth sidewalls. Birefringence and resonant coupling are used in an ATG to enable a polarization filtering and splitting mechanism. For the first time such a filter is experimentally shown. At a wavelength of 1610 nm a power extinction ratio of (1.6 ± 0.2) dB was measured for the TE- polarization in a single approximately 372 μm long TM- pass polarizer. A TE-pass polarizer with a similar length was demonstrated with a TM/TE-power extinction ratio of (0.7 ± 0.2) dB at 1610 nm. The refractive indices of two different InGaAsP compositions, required for a SSC, are measured by the reflection spectroscopy technique. A SSC layout for dielectric-free fabricated compact photodetectors is adjusted to those index values. The development and the results of the final fabrication procedure for the ATG concept are outlined. The etch rate, sidewall roughness and selectivity of a Cl2/CH4/H2 based inductively coupled plasma (ICP) etch are investigated by a design of experiment approach. The passivation effect of CH4 is illustrated for the first time. Conditions are determined for etching smooth and vertical sidewalls up to a depth of 5 μm.	en
dc.description.sponsorship	Science Foundation Ireland (Photonic Integration from Atoms to Systems (PIFAS))	en
dc.description.status	Not peer reviewed	en
dc.description.version	Accepted Version
dc.format.mimetype	application/pdf	en
dc.identifier.citation	Wieczorek A. 2013. Integrated spot size converters for InP based photonic systems. PhD Thesis, University College Cork.	en
dc.identifier.endpage	231
dc.identifier.uri	https://hdl.handle.net/10468/1172
dc.language.iso	en	en
dc.publisher	University College Cork	en
dc.rights	© 2013, Andreas Wieczorek.	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/	en
dc.subject	Spot size converter	en
dc.subject	Asymmetric twin waveguide	en
dc.subject	Photonic integrated circuit	en
dc.subject.lcsh	Integrated circuits.	en
dc.subject.lcsh	Photonics	en
dc.thesis.opt-out	false	*
dc.title	Integrated spot size converters for InP based photonic systems	en
dc.type	Doctoral thesis	en
dc.type.qualificationlevel	Doctoral	en
dc.type.qualificationname	PhD (Science)	en
ucc.workflow.supervisor	cora@ucc.ie	*