A hybrid integrated tunable narrow-linewidth laser is demonstrated in this paper. The hybrid laser comprises a commercial DFB laser butt-coupled to an external cavity with a micro-ring resonator. A transfer matrix model has been presented and the wavelength performance of the laser has been analyzed. In the experiment, the hybrid laser Lorentzian linewidth is ~5KHz and the tuning range is ~2.75 nanometer.
Standard hybrid video coding systems are based on motion compensated prediction with fractional pel displacement
vector resolution. In H.264/AVC, a fixed 6-tap interpolation filter is used to generate the half-pel resolution referenced
blocks. Considering the non-stationary statistical properties of picture sequences, some adaptive interpolations are
introduced in published papers. A practical scheme is proposed to use a three-parameter 1D filter for a whole frame
subject to the statistical properties of the source pictures. The problem for such approach is that a universal filter for the
whole picture can not adapt to the local changes, it is not considered as the optimal solution to the prediction. In this
paper, a local adaptive filter is proposed to adapt to the local statistics of the picture structure. 2D Wiener-Hopf filter of
different sizes are simulated to show the possibility of decreasing the prediction error. A better performance to the
prediction error as well as the total coding performance compared to the 1D adaptive filtering can be achieved.
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