title: 301-nm wavelength tunable differentially driven all-polymer optical filter.
abstract: 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.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Zhang
authors.forename: Alejandro
authors.initials: A
authors.lastname: Maese-Novo
authors.forename: Erik
authors.initials: E
authors.lastname: Schwartz
authors.forename: Crispin
authors.initials: C
authors.lastname: Zawadzki
authors.forename: Norbert
authors.initials: N
authors.lastname: Keil