Mode-selective coupler for wavelength multiplexing using LiNbO3:Ti optical waveguides
- Resource Type
- research-article
- Authors
- Runde, Daniel; Breuer, Stefan; Kip, Detlef
- Source
- Open Physics. 6(3):588-592
- Subject
- 42.79.Gn
42.79.Sz
42.82.Bq
42.82.Et
integrated optics devices
lithium niobate
dense-wavelength division multiplexing (DWDM)
add-drop multiplexer
- Language
- English
- ISSN
- 2391-5471
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.