Dispersion cancellation was proposed to enhance the robustness against dispersion broadening in optical measurement device. Nonlocal dispersion cancellation is suggested to be a pure quantum effect. We propose a novel classical analogy of nonlocal dispersion cancellation, which use frequency anti-correlation to reduce the dispersion broadening to a large extent. The optimized condition is given and analyzed by comparing with quantum light source.
The polarization control(PC), as one of the important issues in photonic information technologies, has attracted great attention. In this paper, we proposed an efficient and compact polarization converter on silicon-on-insulator (SOI) platform based on asymmetrical direction couplers (ADCs). The ADCs consists of two parallel fully etched straight waveguides with different sizes in both width and height. This polarization converter can realize direct conversion between the TE<sub>0</sub> mode and the TM<sub>0</sub> mode with high conversion efficiency. Numerical simulations show that the present PC has a good fabrication tolerance for the variation of the waveguide width and height with high polarization conversion efficiency up to 82%.