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  1. 1 Open Physics

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  1. 1 2008

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  1. 1 Breuer S.

  2. 1 Kip D.

  3. 1 Runde D.

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Mode-selective coupler for wavelength multiplexing using LiNbO3:Ti optical waveguides

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Runde D., Breuer S., Kip D.
Open Physics
|
2008
|
vol. 6
|
issue 3
588-592
EN
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.
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