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K. Korotky and R. M. Ridder, Dual parallel modulation scheme for low-distortion analog optical transmission, IEEE J. Sel. , 8 (7): 1377–1381, 1990. 25. P. R. Ashley and W. S. C. Chang, Linearization technique for a guided-wave electro-optic Bragg modulator, in Digest of Topical Meeting on Integrated and Guided-Wave Optics Atlanta, GA: Optical Society of America, 1986, pp. 36–38. 26. H. Skeie and R. V. Johnson, Linearization of electro-optic modulators by a cascade coupling of phase modulating electrodes, Proc.

In the scalar analysis, the TM mode is replaced by the TE mode of the same order. The solutions obtained from the two methods for the same mode are in general different. The method that starts with a thinner slab usually gives a Waveguides, Optical 11 Figure 10. Same as in Fig. 9(a) except that the refractive index in the claddings of the equivalent slab waveguide is represented in a more general way. Figure 9. In the effective-index method, the rectangular-core waveguide in Fig. 7(a) is replaced by an equivalent slab waveguide, which has an effective index calculated from another slab waveguide.

Refractive-index profile of a graded-index planar waveguide. |q| dx)), xt < x < + ∞, xt (37) (38) and the dispersion relation where q(x) = [n2 (x)k2 − β2 ]1/2 . (31) For the TE mode, ψ and dψ/dx are continuous at x = 0, while for the TM mode, ψ and [1/n2 (x)]dψ/dx are continuous at x = 0. (39) After the effective index has been solved from Eq. (39), the corresponding mode field can be calculated from Eqs. (30)–(38). Equation (39) has the same form as Eq. (5) and therefore can be interpreted by the zig-zag wave model.

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32.Lightwave Technology by John G. Webster (Editor)


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