Mode-selective coupler for wavelength multiplexing using LiNbO₃:Ti optical waveguides
Publication date
2008-09
Document type
Research article
Author
Organisational unit
Technische Universität Clausthal
Scopus ID
Publisher
Central European Science Journals
Series or journal
Central European journal of physics : CEJP
Periodical volume
6
Periodical issue
3
First page
588
Last page
592
Part of the university bibliography
Nein
Language
English
Abstract
A mode-selective directional coupler based on titanium in-diffused channel waveguides in lithium niobate is investigated. This coupler may be utilized as a key part of an add-drop multiplexer for dense wavelength division multiplexing in optical network nodes. The proposed coupler is based on evanescent coupling of the fundamental mode of a single-mode channel to the first higher mode of a parallel bi-modal waveguide. Our experimental results show that a compact directional coupler with coupling efficiencies larger than 90%, large bandwidth around 1550 nm, and with negligible polarization dependence can be realized using electro-optic lithium niobate substrates. © Versita Warsaw and Springer-Verlag Berlin Heidelberg 2008.
Version
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