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Polymer embedded silicon nitride thermally tunable Bragg grating filters

 
: Zhang, Z.; Liu, D.; Felipe, D. de; Liu, A.; Keil, N.; Grote, N.

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Applied Physics Letters 102 (2013), Nr.18, Art. 181105, 4 S.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Englisch
Zeitschriftenaufsatz
Fraunhofer HHI ()

Abstract
Optical waveguides have been fabricated and investigated that employ silicon nitride as core and polymer as surrounding cladding material. Buried single-mode waveguides showed a propagation loss of 0.7 dB/cm at 1550 nm. Depending on the thickness of the silicon nitride core, the optical mode can be designed to expand largely into the polymer cladding. Using such a low-confinement structure and a metal strip heater embedded in the polymer cladding material beneath the core region, efficient thermally tunable waveguide Bragg grating filters were demonstrated. Wavelength tuning >57 nm was achieved at 220 mW of electrical heating power.

: http://publica.fraunhofer.de/dokumente/N-254905.html