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301-nm wavelength tunable differentially driven all-polymer optical filter

: Zhang, Z.; Maese-Novo, A.; Schwartz, E.; Zawadzki, C.; Keil, N.


Optics Letters 39 (2014), Nr.17, S.5170-5172
ISSN: 0146-9592
Fraunhofer HHI ()

An optical filter based on all-polymer grating-assisted directional coupler is demonstrated. The wavelength tuning is differentially driven. The heater-electrodes created on the sidewalls of the polymer ridge can either blue- or red-shift the central wavelength. A total tuning range of 301 nm is achieved experimentally. The maximal local temperature gradient introduced across the coupler region is only 55°C-68°C. The filter is also insensitive to uniform ambient temperature change. Central wavelength jitter of ±3 nm is observed when the chip holder temperature cycles between 20°C and 80°C.