Tunable Bragg filter based on polymer/silica hybrid waveguide platform

Owing to its compact footprint and superior filter properties, the Bragg grating filter is attractive for applications in optical communications. In this research, we conducted a detailed analysis of the influence of Bragg grating parameters on its functionality and experimentally validated our findings on a simple and low-cost polymer/silica hybrid waveguide platform. The best extinction ratio of 26.3 dB is obtained when the period is 6.63 μm and the number of periods is 200. The full width at half maximum of the grating is 0.35 nm at 1544.74 nm. Tuning efficiency reaches 29.6 pm/mW owing to the high thermo-optical efficiency of the polymer. Finally, we measure the rise and fall times of the grating to be 280 μs. The proposed grating shows great potential in flexible and reconfigurable optical networks.