By S. Pelli, G. C. Righini (auth.), S. Martellucci, A. N. Chester, M. Bertolotti (eds.)
This volwne includes the complaints of a two-week summer season convention titled "Advances in built-in Optics" held June 1-9, 1993, in Erice, Sicily. This was once the 18th annual direction prepared via the overseas college of Quantum Electronics, less than the auspices of the "Ettore Majorana" Centre for medical tradition. The time period built-in Optics indicates guided-wave optical circuits inclusive of or extra units on a unmarried substrate. because its inception within the overdue 1960's, built-in Optics has developed from a really expert learn subject right into a large box of labor, starting from simple examine via advertisement functions. at the present time many units can be found on industry whereas an immense attempt is devolved to investigate on built-in nonlinear optical units. This convention was once equipped to supply a finished survey of the frontiers of this know-how, together with primary thoughts, nonlinear optical fabrics, units either within the linear and nonlinear regimes, and chosen functions. those complaints replace and increase the fabric contained in a prior ISQE quantity, "Integrated Optics: Physics and Applications", S. Martellucci and A. N. Chester, Eds. , NATO ASI sequence B, Vol. ninety one (Plenum, 1983). For a few heavily comparable expertise, the reader many additionally desire to seek advice the ISQE volumes: "Optical Fiber Sensors", A. N. Chester, S. Martellucci and A. M. Scheggi, Eds. , NATO ASI sequence E, Vol. 132 (Nijhoff, 1987) ; and, "Nonlinear Optics and Optical Computing", S. Martellucci and A. N. Chester, Eds. , E. Majorana Int'! technology sequence, Vol. forty nine (plenum, 1990).
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They are governed by the nonlinear coupled mode equations _i / -i ~; = [ 8: + A~! (laJ ) ]a! + Ca2 ~a: =[ - ~+A~2(la212)]a2 +Ca! (41) where a p a2 are the amplitudes of mode in individual waveguides 1 and 2, 8~ = ~1 - ~2 is the linear propagation constant difference of the two guides, C is the linear coupling coefficient and A~i(laJ) is the power-dependent refractive index change in channel i for arbitrary nonlinearity. For saturable nonlinearity, A~i can be given by the form 89 (42) where Wi is the normalized saturation parameter related to the actual saturation value A~sat and Pci is the critical power defined for the Kerr effect, and Pi = lail2 is the power in waveguide i.
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Nonlinear Wave Propagation in Planar Structures The key concept on which all nonlinear guided wave optical devices are based is that the local intensity of the guided wave controls the propagation wavevector; that is, the field profile and propagation constant can become power dependent when one or more of the layered media is characterized by an intensity dependent refractive index. This behaviour is characteristic of media possessing third-order nonlinearities. These media need not be crystalline because third order nonlinearities exist also in media possessing an inversion center, and this widens the possibility of choice of structures and materials.