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Design of a compact multimode interference coupler based on deeply-etched SiO2 ridge waveguides
KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2007 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 271, no 2, 404-407 p.Article in journal (Refereed) Published
Abstract [en]

A compact multimode interference (MMI) coupler is realized by using deeply-etched SiO2 ridge waveguides, which have a strong confinement in the lateral direction and improve the quality of self-images in the MMI section, A 1 x 4 MMI coupler is designed as a numerical example and demonstrates good performances such as a low insertion (0.0275 dB) and small non-uniformity (0.0507 dB). The total device size of the present MMI coupler is reduced to about 1/16 of that based on SiO2 buried waveguides.

Place, publisher, year, edition, pages
2007. Vol. 271, no 2, 404-407 p.
Keyword [en]
multimode interference, coupler, silica, waveguide, deeply etched, ridge
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-24455DOI: 10.1016/j.optcom.2006.10.084ISI: 000244488900016Scopus ID: 2-s2.0-33846188136OAI: oai:DiVA.org:kth-24455DiVA: diva2:349978
Note
QC 20100909Available from: 2010-09-09 Created: 2010-09-09 Last updated: 2010-09-09Bibliographically approved
In thesis
1. Design, Simulation and Characterization of Some Planar Lightwave Circuits
Open this publication in new window or tab >>Design, Simulation and Characterization of Some Planar Lightwave Circuits
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Optical devices based on planar lightwave circuit (PLC) technology have the advantages of small size, high reliability, possibility for large scale production, and potential integration with electronics. These devices are widely employed in optical telecommunications, sensing, data storage, imaging, and signal processing. This thesis focuses on some selected PLC based devices, such as power splitters, demultiplexers, triplexers and polarization beam splitters.

First, the basic principle of the waveguides and the simulation methods for PLC devices are discussed. A novel effective index method is introduced to reduce a two-dimensional structure to a one-dimensional one, and can be implemented for arbitrarily shaped waveguides. Numerical methods, such as finite-difference mode solver, beam propagation method, finite-difference time-domain method are introduced to analysis the mode profile of the waveguides, and the propagation properties of light in PLC devices.

Multimode interference (MMI) couplers are widely used in many PLCs, such as power splitters, ring lasers, optical switches, and wavelength division multiplexers/demultiplexers. In this work, concepts for improving the self-imaging quality of MMI couplers are analyzed and new designs are proposed. A significant improvement in performance together with compact sizes were obtained with taper sections at the input/output of MMI couplers based on SOI, and deeply etched ridges in MMI couplers based on SiO2. A polarization insensitive dual wavelength demultiplexer based on sandwiched MMI waveguides was presented.

Novel devices including triplexers and polarization beam splitters were realized by using photonic crystal (PhC) structures. Two stages of directional couplers based on PhC waveguides are cascaded to form an ultracompact triplexer. The special decoupling property of the PhC waveguide based directional coupler was utilized in the design. A novel polarization beam splitter was realized by combining a MMI coupler and a PhC which works as a polarization sensitive reflector.

Finally, fabrication and optical characterization of an ultra-compact directional coupler and PhC structures in InP are presented. In a single etching step, by using the lag-effect in inductively coupled plasma reactive ion etching, a compact directional coupler (55 μm) is demonstrated. Carrier life times in PhC structures etched by chemically assisted ion beam etching were investigated, for emitter and switching applications.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. xiv, 84 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2008:9
Keyword
planar lightwave circuit, waveguide, coupler, multimode interference, photonic crystal waveguide, (de)multiplexer, triplexer, polarization beam splitter, dry etching, carrier life time.
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-4760 (URN)978-91-7178-989-1 (ISBN)
Public defence
2008-06-09, sal N2, Electrum 3, Isafjordsgatan 28, Kista, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100909Available from: 2008-05-16 Created: 2008-05-16 Last updated: 2010-09-09Bibliographically approved

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