Abstract

The nonlinear change of the dielectric constant (Kerr effect) in a glass fiber can be utilized to self-confine optical pulses in a multimode fiber at wavelengths longer than 1.3 μm. The range of the deviation in the group velocity Δν_g of the different modes to be confined is given by Δν_g²/ν_g² ≤ 2(∂ν_g/∂f × f/ν_g)n₂/n₀|E|², where f and ν_g are the frequency and the group velocity, respectively, of the mode; n₀ and n₂ (= 3 × 10⁻²² m²/V²) are the linear and nonlinear indices of refraction; and E is the peak electric field averaged over the cross sections of the fiber.

© 1980 Optical Society of America

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