Nonlocal spatial solitons are the optical spatial solitons in nonlocal nonlinear media. In this invited paper, a review is given about the progress on this subject. The nonlocal spatial solitons are phenomenologically modeled by the nonlocal nonlinear Schrodinger equation, which can be simplified to a linear model for a strong nonlocality. An exact analytical Gaussian-shaped solution to the linear model is obtained, and a spatial soliton called an accessible soliton is found to exist. A phase shift of such an accessible soliton can be very large comparable to its local counterpart, and this finding might be applied in integrated all-optical devices. More intriguing is the collision between two nonlocal spatial solitons. The interaction of two coherent accessible solitons is always attractive, independent of their relative phase, unlike in a local nonlinearity. Such an interaction behavior is experimentally observed in nematic liquid crystals, and a power-dependent X junction, AND, NOR, and XNOR gates are also experimentally demonstrated. This collisional characteristics has implications to all-optical switching and all-optical logic.
We discuss the propagation characteristics of the electromagnetic field in the symmetric metal-clad planar uniaxial crystal waveguide. For the special waveguide structure that the optical axis of the crystal is on the x-z plane, where x is the normal direction of the waveguide plane and z is the propagation direction, we obtain the analytic accurate solution of the modal fields. It is shown that:(1) there are TE mode and TM mode in this special waveguide structure; 2) The direction of the wave vector and the Poynting vector of TM mode are not collinear; (3) The principal mode of the waveguide is the principal mode of TE mode for the negative uniaxial crystal, but the one of TM mode for the positive uniaxial crystal.
The nonlinear Schroedinger equation in erbium-doped fiber and the more generalized form of the propagation equation in the erbium-doped fiber amplifiers are obtained which have included the phase shift that the erbium ions induce. An analytical expression is given to the erbium ions induced phase shift and frequency chirp. It was found that the frequency chirp dose not change much with the wavelength except at the neighboring wavelengths (around 1.531 micrometer) where the absorption and the emission cross-sections of the erbium ions reach their maximum, and the frequency chirp has opposite sign on the two sides around 1.531 micrometer.
Conference Committee Involvement (3)
Optical Transmission, Switching, and Subsystems
2 November 2007 | Wuhan, China
Optical Transmission, Switching, and Subsystems III
7 November 2005 | Shanghai, China
Optical Transmission, Switching, and Subsystems II
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