Berlin 2018 – scientific programme
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DS: Fachverband Dünne Schichten
DS 17: Poster Session I
DS 17.10: Poster
Tuesday, March 13, 2018, 18:15–20:15, Poster B
Acoustically tuned dynamic wavelength division multiplexing — •Dominik D. Bühler1, Antonio Crespo-Poveda1, Klaus Biermann2, Andrés Cantarero1, Paulo V. Santos2, and Mauricio M. de Lima1 — 1Materials Science Institute, University of Valencia, Spain — 2Paul-Drude Institute for Solid State Electronics, Berlin, Germany
Phasar multiplexers based on arrayed waveguide grating (AWG) devices are key components in modern integrated photonic systems. Acoustically tuning these multiplexers enables robust, compact and fast responding devices improving on recently demonstrated technology. Different concepts will be presented in each of which a surface acoustic wave (SAW) is induced in such a way that its propagation direction coincides perpendicularly with the AWG. The WGs of this grating introduce dispersion and connect two multimode interference (MMI) couplers of distinct lengths that are employed as a power splitter and combiner, respectively. By tuning the SAW amplitude this setup allows us to alter the refractive index in each arm discretely and, thus, introduce specific phase shifts resulting in wavelength depended constructive interference at each of the outputs of the combiner MMI. This mechanism can be readily applied for wavelength routing and circuit switching in optical networking systems of essentially any material platform. The devices here are presented for operation at the telecommunication wavelengths around 1.55 μm, working on a (Al,Ga)As platform and tuned by a SAW in the low GHz range.