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oe1(光电查) - 科学论文

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  • Controlling light tunneling by adiabatic passage in two modulated nonlinear waveguides

    摘要： We theoretically investigate light propagation in two coupled nonlinear waveguides with a certain static propagation constant detuning between two waveguides and with the linear refractive index modulated along the propagation direction. By slowly varying the amplitude of modulation, we steer the light to the desired output waveguide when equal amounts of lights are launched into each waveguide. We reveal that depending on the sign of the static propagation constant mismatch (detuning) between two waveguides, the launched light can be completely switched to either of waveguides. Additionally, we numerically examine the performances of light switching for general inputs and modulation amplitudes, and show that the localization of output light is robust against small to moderate variations in the ?nal modulation amplitude, phase di?erence and intensity distribution of input ?eld between two waveguides. More importantly, according to the principle of the proposed scheme, we are capable of steering the output light to the targeted waveguide at extremely low input power. In theory, our ?ndings can be explained qualitatively by means of adiabatic navigation of the so-called nonlinear Floquet states.

    关键词： Light tunneling,Nonlinear waveguides,Adiabatic passage

    更新于2025-09-16 10:30:52

  • ALL-OPTICAL LOGIC GATES BASED ON SPATIAL-SOLITON INTERACTIONS IN OPTICAL COMMUNICATION SPECTRAL REGION

    摘要： New designs of all-optical logic gates based on spatial-soliton interactions in optical communication spectral regions were proposed. The proposed structures are composed of local nonlinear Mach-Zehnder interferometer (MZI) waveguide structures with multi-input ports and two nonlinear output ports. They can be used to design various all-optical logic gates. The nonlinear MZI waveguide structure with local nonlinear waveguides functions like a phase shifter. It employs angular de?ection of spatial solitons controlled by the phase modulation created in the local nonlinear MZI. The light-induced index changes in the local nonlinear MZI waveguide structures break the symmetry of structure and make the output signal beam propagate through di?erent nonlinear output waveguides. By properly choosing the input control power, the spatial solitons will be switched to di?erent output ports. The numerical results show that the proposed local nonlinear MZI waveguide structures could really function as all-optical logic gates in the optical communication spectral region.

    关键词： all-optical logic gates,spatial-soliton interactions,nonlinear waveguides,optical communication spectral regions,Mach-Zehnder interferometer

    更新于2025-09-12 10:27:22